Wednesday, September 12, 2012
3V FM transmitter Circuit
3V FM transmitter Circuit
This 3V FM transmitter Circuit is about the simplest and best basal transmitter to body and accept a advantageous transmitting range. It is decidedly able admitting its baby basic calculation and 3V operating voltage. It will calmly access over three floors of an accommodation architecture and go over 300 meters in the accessible air.
The ambit is basically a radio abundance (RF) oscillator that operates about 100 MHz. Audio best up andamplified by the electret microphone is fed into the audio amplifier date congenital about the aboriginal transistor. Output from the beneficiary is fed into the abject of the additional transistor area it modulates the beating abundance of the catchbasin ambit (the 5 about-face braid and the trimcap) by capricious the alliance capacitance of the transistor. Alliance capacitance is a action of the abeyant aberration activated to the abject of the transistor. The catchbasin ambit is affiliated in a Colpitts
Place the transmitter about 10 anxiety from a FM radio. Set the radio to about about 89 - 90 MHz. Walk aback tothe FM transmitter and about-face it on. Spread the ambagious of the braid afar by about 1mm from anniversary other. No coilwinding should be affecting addition winding. Use a baby spiral disciplinarian to tune the trim cap. Remove the screwdriverfrom the trim spiral afterwards every acclimation so the LC ambit is not afflicted by devious capicitance. Or use a plasticscrewdriver. If you accept adversity award the transmitting abundance again accept a additional being tune up and downthe FM punch afterwards every adjustment. One abounding about-face of the trim cap will awning its abounding ambit of capacitance from 6pF to 45pF. The accustomed FM bandage tunes in over about one tenth of the abounding ambit of the affability cap.
So it is best to acclimatize it in accomplish of 5 to 10 degrees at anniversary turn. So affability takes a little backbone but is not difficult. The acumen that there charge be at atomic 10 ft. break amid the radio and the FM transmitter is that the FM transmitter emits harmonics; it does not alone afford on one abundance but on several altered frequencies abutting to anniversary other. You should accept little adversity in award the Tx abundance back you chase this procedure.
Monday, September 10, 2012
Wireless Headphones Receiver
Wireless Headphones Receiver
The wireless headphones receiver presented is an accepted appliance of ZN415 produced by Ferranti ( abbreviate beachcomber receiver). ZN415 assures a affection reproduction, has a 1.5 array alimentation and contains a MA detector and audio amplifier.
The accepted burning is < 5mA, L1 has 40 turns, 0.2 Ø chestnut and 20mm Ø ferrite. C1 is adjuted with an non metal screw, the accession abundance of this wireless headphone receiver is amid 1.7MHz and 3.4MHz – shortwave receiver. This wireless receiver is to be acclimated with this wireless headphones transmitter.
Friday, September 7, 2012
12V Low side and High side PWM Motor/Light Controller
12V Low side PWM Motor/Light Controller
12V High side PWM Motor/Light Controller
These two schematics are variations on addition PWM circuit that I designed. The diagrams are for 12V operation alone and there are aerial ancillary (common ground) and low ancillary (common +12V) versions. The low ancillary adaptation of the ambit uses an N Channel FET, the aerial ancillary adaptation of the circuit uses a P Channel FET. N Channel accessories tend to handle added accepted than P Channel devices, they are additionally beneath expensive. The aerial ancillary adaptation of the ambit is advantageous back one ancillary of the bulk has to be grounded.
This Circuit can about-face a adequately aerial bulk of current, an IRFZ34N MOSFET can handle over 35 Amps if affiliated to a able calefaction sink. Higher ability FETs, such as the IRFZ48N or IRF1010Z can be commissioned if alike beyond currents are required. It is additionally accessible to affix assorted FETs in alongside for alike added accepted capacity. Always use thermally conductive grease amid the FET and the calefaction sink, and bethink that the calefaction bore is electrically live.
Inductive endless (motors) may crave appropriate affliction back they can accomplish ample voltage spikes that can accident the MOSFET. Replacing the 1N4002 with a fast accretion diode may advice blot the about-face voltage bang back active an anterior bulk such as a motor. If you use these circuits for abstracts with electric vehicles, be abiding to install a ambit breaker in alternation with the battery, the ambit breaker should be accessible to ability by the driver. This is abnormally important due to the actuality that back MOSFETs fail, they generally abbreviate out, abrogation the motor on at abounding speed.
Note that the pwm ascendancy has an adverse aftereffect on these two circuits, the low ancillary adaptation is on with a aerial pin 7 achievement voltage and the aerial ancillary adaptation is on with a low output.
The inductor on the aboideau ancillary of the ability MOSFET transistor can be a ferrite bean or a few turns of wire captivated about a 10 ohm, 1/4W resistor. The purpose of this allotment is to anticipate RF oscillations from occurring in the MOSFET circuitry.
Thursday, September 6, 2012
AM Transmitter Double Side Band
AM Transmitter Double Side Band
The ambit of AM transmitter is advised to address (amplitude modulated) DSB (double ancillary band) signals. A articulate AM arresting consists of a carrier and two symetrically spaced ancillary bands. The two ancillary bands accept the aforementioned amplitude and backpack the aforementioned information. In fact, the carrier itself coveys or carries no information. In a 100% articulate AM arresting 2/3 rd of the ability is ashen in the carrier and alone 1/6th of the ability is independent in anniversary ancillary band.
In this transmitter we abolish the carrier and transmitt alone the two ancillary bands. The able achievement of the ambit is three times that of an agnate AM transmitter.
Op Amp IC741 is acclimated actuality as a microphone amplifier to amplify the articulation best up by the condenser microphone. The achievement of the op amp is fed to the bifold counterbalanced modulator (DBM) body about four IN4148 diodes. The accentuation akin can be adapted with the advice of preset VR1.
The carrier is generated application clear oscillator active about BC548 transistor T2. The carrier is added amplified by transistor T1, which additionally acts as a absorber amid carrier oscillator and the counterbalanced modulator. The alive abundance of the transmitter can be afflicted by application crystals of altered frequencies. For multi abundance operation, alternative of altered crystals can be fabricated application a selector switch.
Ths achievement of the DBM contains alone the artefact (of audio and carrier) frequencies. The DBM suppresses both the ascribe signals and produces bifold ancillary bandage suppressed carrier (DSBSC) at its output. However, back the diodes acclimated in the counterbalanced modulator are not absolutely matched, the achievement of the DBM does accommodate some balance carrier. This is accepted as carrier leakage. By adjusting the 100 ohm preset VR2 and trimmer C7 you can absent the carrier leakage.
To accept DSB signals you charge a exhausted abundance oscillator to reinsert the missing carrier. If you don’t accept a exhausted abundance oscillator, or appetite to transmitt alone AM signal, acclimatize preset VR2 to aperture some carrier so that you can accept the signals on any accustomed radio receiver. In AM approach 100% accentuation can be accomplished by adjusting preset VR1 and VR2.
X1 – 8+8 Turns Bifalar 24 SWG On TV Balune CoreX2 – Primary 12 Turns, Secondary 4 Turns. 24 SWG on TV Balun Core (dot indicates start of coil).
X3 – 20 Turns 24 SWG on TV Balun Core
Range of the circuit depends on the type of antenna used. It is very important to use matched antenna to radiate the signals effectively. I used horizontal dipole antenna, which is simple and easy to construct. For 7 MHz, ie 40 meter ham band the length of dipole antenna will be 20 meter. Use 75 Ohms co-axial cable to connect antenna and transmitter. I was able to get 57 report from station 80 kilometer away. You can easily add a Linear RF amplifier using IRF830 to get more power.
Tuesday, September 4, 2012
Car Alarm Arming Horn Beep Canceller
Car Alarm Arming Horn Beep Canceller Circuit diagram
It's a abundant accessibility that best avant-garde cars appear with a congenital in alarm, about it is annihilation but babble abuse that the horn sounds back the anxiety is armed. Disconnecting the anxiety arrangement from the horn broadcast will annihilate this, but anticipate the horn from aural in the alike of an absolute alarm.
This circuit serves to blackout the arming beep yet advance the anxiety by introducing a baby adjournment into the signal. It sits amid the anxiety and horn relay. The anxiety charge accommodate a connected horn arresting for at atomic 3 abnormal afore the horn broadcast is activated. That way the quick "beep" will never actuate the horn relay, while the connected anxiety arresting will.
This circuit serves to blackout the arming beep yet advance the anxiety by introducing a baby adjournment into the signal. It sits amid the anxiety and horn relay. The anxiety charge accommodate a connected horn arresting for at atomic 3 abnormal afore the horn broadcast is activated. That way the quick "beep" will never actuate the horn relay, while the connected anxiety arresting will.
Sunday, September 2, 2012
40 Segment LED S-Meter
40 Segment LED S-Meter Circuit
Provide your radio with a actual cord signal, again acclimatize the HIGH LEVEL pot to the beginning of anecdotic the aftermost LED (all LEDs on). Remove the arresting completely, again acclimatize the LOW LEVEL pot to the beginning of no LEDs illuminated.
If your radio's S-meter achievement is greater than 5 volts, you mau ambition to alter the HIGH LEVEL pot with a 10K resistor, and accommodate pin 6 of the right-most 3914 with the cathode of a 6.1 volt zener diode, pulled up to 13 volts with a 1K resistor. The anode should be affiliated to ground. You may use a college voltage zener if necessary.
This agreement provides 10ma per LED segment. Change the ethics to the resistors and pots to change the drive accepted to the LEDs. R1=12.5/I R2=25/I R3=37.5/I R4=50/I area I = the adapted LED current
Saturday, September 1, 2012
40 m Band Direct Conversion Receiver
40 m Band Direct Conversion Receiver
Building a applied and accessible absolute about-face receiver for the 40 m CW bandage is not as simple as it ability appear. Broadcast base signals from the adjoining 41 m band, will calmly afflict best absolute about-face mixer designs with their exceptionable (and absolutely nearby) S9 +40 dB signals. My band-aid incorporates a diode-ring mixer and a attenuated bandage rf ascribe filter. These choices aftereffect in empiric all-embracing receiver activating ambit than that accomplished back application an IC mixer bore (such as a NE612). Comfortable and undisturbed operation in the black was accessible back activated application my Windom antenna. Some of this project's objectives included:
- High dynamic range diode-ring mixer
- Stable oscillator with a 30 kHz tuning range
- Tuning range from 7005 kHz to 7035 kHz
- Narrow front end band pass input filter
- Broadband 50 Ohm termination
- Audio selectivity used in the AF amplifier
- Symmetrical (differential coupling) design
- Low battery / power supply current consumption
- 60 Ohm headphone output impedance
You may admit abounding of the date circuits - as they are agnate to those acclimated in some of my added projects. The VFO and the RF ascribe bandage canyon clarify are anniversary advised about bowl resonators. These are acceptable difficult to locate. [See the agenda below.] I accept acclimated a HPF505 blazon arena diode mixer - but added mixers such as the IE500 or SRA1 should be suitable. The diode arena mixer achievement drives a alongside adjustment consisting of R11 and the cogwheel ascribe impedances of IC1. This after-effects in a added abiding 50-Ohm broadband abortion for the mixer achievement (by adverse to that accessible on a archetypal RCL based diplexer).
The accretion of the broadband amplifier afterward the mixer, IC1, is set by the best of R10. A 40 dB accretion is accomplished by application 100-Ohm resistor at R10. Any IC1 rf achievement signals are shunted to arena - abrogation alone an audio arresting to be activated to the afterward stage. IC2 is an operational amplifier that is acclimated to amplify the actual audio signals by yet an added 46 dB. Passive audio clarify apparatus are acclimated at the ascribe of IC2 so that alone signals at or abreast 750 Hz are amplified. The all-embracing accretion and achievement akin is about too abundant for adequate headphone listening. An rf attenuator (P1 amid abreast the antenna ascribe terminal) is acclimated as a agency of authoritative the receiver achievement volume
Tuesday, August 21, 2012
Infrared ( IR ) Headphones Receiver
Use this infrared headphones receiver with the ir headphones transmitter. Use 600Ω headphones. BPW41N and BP104 accept a clarify for arresting ablaze and are centered on 950nm at 250C. At accustomed ablaze beam and 3 to 4 meters ambit the audio distorsion were 1 – 2%, wich is not bad for such a simple ir headphones receiver schematic20W RF FM amplifier circuit diagram
20W RF FM amplifier circuit diagram
This Fm rf ability amplifier has 2 transistors from Philips : BLV 10 and BLW 87. The 2 rf transistors assignment in chic C and this fm amplifier has a absolute accretion of 21dB ( 100 X ) and ability 55 – 65%.
One low canyon clarify with 9 apparatus ensures 60dB bounce on the additional harmonic. There is no charge for action to awning the accomplished 88 – 108 MHz FM frequencies.
Sunday, August 19, 2012
Portable Detector Comparator Temperature
This circuit called the Portable Detector Comparator Temperature, to ascertain actual baby changes in temperature in affiliation to the Ambient temperature.
IC1 acts as a arch detector and amplifier: its achievement voltage raises back temperature increases and vice-versa. This happens because the n.t.c. resistor R2 reduces its attrition amount as temperature increases and vice-versa, accordingly unbalancing the arch formed by R1, R2, R4, R5. IC2A and IC2B anatomy a window comparator and R8 is the acuteness control.
Before starting a altitude the ambit charge be counterbalanced by agency of R1 in adjustment to access that both LEDs are off. If R8 is set to aught attrition the ambit acuteness will be at best and one of the LEDs will brighten back a actual slight aberration in temperature will be detected. As R8 amount is added the ambit acuteness will decrease.
Portable Detector Comparator Temperature Part List
R1 = 22K Linear Potentiometer R2 = 15K @ 20°C n.t.c. Thermistor R3 = 10K R4,R5,R7,R9 = 22K R6 = 220K R8 = 5K R10 = 680R C1 = 47µF D1 = Red LED D2 = Green LED IC1 = TL061 Low current BIFET Op-Amp IC2 = LM393 Dual Voltage Comparator IC P1 = SPST Pushbutton B1 = 9V
Friday, August 17, 2012
4-Digit Alarm Control Keypad
4-Digit Alarm Control Keypad Circuit Diagram
The Keypad charge be the affectionate with one accepted terminal - and a abstracted affiliation for anniversary key. On a 12-key pad - attending for 13 terminals. The cast blazon with 7 or 8 terminals will NOT do. On the Support Page you'll acquisition capacity of how to Accomplish Your Own Keypad.
The broadcast is activated by acute a distinct key. Choose the key you appetite to use - and affix it to terminal "E". Choose the four keys you appetite to use for your aegis cipher - and affix them to "A B C & D". Wire the accepted advance to R1- and all the actual keys to "F".
When you columnist "E" the broadcast energizes - and the 12-volt achievement moves from the "off" to the "set" terminal. The blooming LED additionally lights. It provides a beheld adumbration that the anxiety is set.
When you columnist keys "A B C & D" in the appropriate adjustment - the broadcast de-energizes - and the 12-volt achievement allotment to the "off" terminal. The blooming LED is additionally abolished - to announce that the anxiety is switched off.
The actual keys - those not active to "A B C D & E" - are affiliated to "F". Whenever one of these "Wrong" keys is apprenticed - the attempted cipher access fails - and the cipher access arrangement is reset.
The aforementioned affair happens if "C" or "D" is apprenticed out of sequence. If "C" is apprenticed afore "B" - or "D" is apprenticed afore "C" - the attempted cipher access will fail. And the cipher access arrangement will reset.
With a 12-key pad - over 10 000 altered codes are available. If you charge a added defended cipher - you could artlessly use a bigger keypad with added "Wrong" keys active to "F". A 16-key pad gives over 40 000 altered codes. If you accomplish a aberration while entering the cipher - artlessly alpha again.
The Support Material for this circuit includes a step-by-step adviser to the architecture of the ambit lath - a genitalia account - a abundant ambit description - and more.
Tuesday, August 14, 2012
High Current Regulated Supply
The High Current Regulated Supply beneath uses an added ambagious or a abstracted agent to accumulation ability for the LM317 regulator so that the canyon transistors can accomplish afterpiece to assimilation and advance efficiency. For acceptable ability the voltage at the collectors of the two alongside 2N3055 canyon transistors should be abutting to the achievement voltage. The LM317 requires a brace added volts on the ascribe side, additional the emitter/base bead of the 3055s, additional whatever is absent beyond the (0.1 ohm) equalizing resistors (1volt at 10 amps), so a abstracted agent and rectifier/filter ambit is acclimated that is a few volts college than the achievement voltage.
The LM317 will accommodate over 1 amp of accepted to drive the bases of the canyon transistors and assumming a accretion of 10 the aggregate should bear 15 amps or more. The LM317 consistently operates with a voltage aberration of 1.2 amid the achievement terminal and acclimation terminal and requires a minimum amount of 10mA, so a 75 ohm resistor was called which will draw (1.2/75 = 16mA). This aforementioned accepted flows through the emitter resistor of the 2N3904 which produces about a 1 volt bead beyond the 62 ohm resistor and 1.7 volts at the base. The achievement voltage is set with the voltage affiliate (1K/560) so that 1.7 volts is activated to the 3904 abject back the achievement is 5 volts. For 13 volt operation, the 1K resistor could be adapted to about 3.6K. The regulator has no achievement abbreviate ambit aegis so the achievement apparently should be fused.
The LM317 will accommodate over 1 amp of accepted to drive the bases of the canyon transistors and assumming a accretion of 10 the aggregate should bear 15 amps or more. The LM317 consistently operates with a voltage aberration of 1.2 amid the achievement terminal and acclimation terminal and requires a minimum amount of 10mA, so a 75 ohm resistor was called which will draw (1.2/75 = 16mA). This aforementioned accepted flows through the emitter resistor of the 2N3904 which produces about a 1 volt bead beyond the 62 ohm resistor and 1.7 volts at the base. The achievement voltage is set with the voltage affiliate (1K/560) so that 1.7 volts is activated to the 3904 abject back the achievement is 5 volts. For 13 volt operation, the 1K resistor could be adapted to about 3.6K. The regulator has no achievement abbreviate ambit aegis so the achievement apparently should be fused.
Sunday, August 12, 2012
300W RF Power Amplifier Circuit
300W RF Power Amplifier Circuit
Here you got it! 300 W rf authentic ability for fm transmission. 300 W radio ability amplifier for accomplished 88 – 108 MHz !!! This fm amplifier has 2 TP9383 abundant to bear up to 300W.
60Watt RF (Radio Frequency) Amplifier
60Watt RF (Radio Frequency) Amplifier Circuit
The 60Watt RF (Radio Frequency) Amplifier is simple all solid accompaniment ambit application ability mosfet IRF840. The IRF alternation of ability transistors are accessible in assorted voltage and ability ratings. A distinct IRF840 can handle best ability achievement of 125 watts. Since these transistors are acclimated in inverters and smps they are calmly accessible for about Rs: 20/-.
The IRF beeline amplifier can be affiliated to the out put of accepted VWN-QRP to get an achievement of 60 Watts. The ambit draws 700 ma at 60 Volt Vcc. Good calefaction bore is a charge for the ability transistor.
Alignment of the ambit is actual easy. Connect a copy amount to the out put of the circuit. You can use some baby ball like 24V 6Watts as the copy load. I accept alike acclimated 230V 60Watts ball as copy amount with my IRF840 ability amplifier alive at 120Volts. Adjust the 10K preset to get about 100 ma Cesspool current. I acclimated aboideau voltage of 0.8V with my beeline amplifier. A heigh aboideau voltage can accomplish the ability transistor get distroyed by cocky oscillation. So aboideau voltage charge be beneath 2V and acclimation at 1V will be safe.
Bifalar transformaer T1 is anguish with 8 turns 26SWG on 1.4 x 1 balun core. The braid on the cesspool of IRF is 3 turns 20 SWG anguish on 4 cardinal of T13.9 torroids (two torroids are ample to anatomy a balun core). The RFC at the Vcc band is 20 Turns 20 SWG anguish on T20 torroid.
Sunday, August 5, 2012
FM Telephone Transmitter
The FM telephone circuit is built on a PC board that is so small it can easily be fitted inside the housing of a telephone making it an instant pseudo-speak earphone.
Here's the FM telephone transmitter circuit :
This FM circuit connects in series with telephone line, steals power from it, and transmit at both sides of the conversation to an FM radio tuned between 90 and 95 MHz.
[read here...]
Here's the FM telephone transmitter circuit :
This FM circuit connects in series with telephone line, steals power from it, and transmit at both sides of the conversation to an FM radio tuned between 90 and 95 MHz.
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| FM Telephone Transmitter |
Friday, August 3, 2012
Light Alarm Circuit Using LDR
This light alarm circuit is very simple and very easy to assemble even for beginners though it is not difficult. The well-known UM66 is used as the sound generator and Will give a pleasent wake up alarm.
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| Light Alarm Circuit Using LDR |
UM66 Pinout
LDR is a light dependent resistor. Normally the resistance of an LDR is very high, Sometimes as high as 1MΩ, but Pls They are illuminated with light resistance drops dramatically. In the circuit adjust the presets to the Desired 220KΩ sensitivity, meaning adjusting the threshold point where the alarms start singing.
When there is light on the light dependent resistor the transistor T1 will from the start conducting and musical UM66 powers the integrated circuit.
for more details about LDR light alarm circuit please visit http://electroschematics.com/6353/light-alarm-circuit-with-ldr/
Wednesday, August 1, 2012
TDA0161 Metal Detector
This metal detector circuit diagram is based on the IC TDA0161, designed for metallic body detection by detecting the variations in high frequency Eddy current losses. For detecting metals , TDA0161 require an external LC tuned circuit .
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| TDA0161 Metal Detector Circuit |
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| TDA0161 Pin-Out |
Output signal is determined by supply current changes. Independent of supply voltage, this current is high or low according to the presence or the absence of a close metallic object. This medal detector circuit use two LEDs , which offer an visual indication of presence or absence at a metals ,around the coil . To adjust the circuit you need to make sure there is no metal near the coil and then set the fine adjustment to a "Mid position". After that you need to adjust the course adjustment to turn on the LED and , adjust the fine adjustment to turn off the LED.
This metal detector electronic circuit operates over a wide range input voltage of 4 -35 volts . If you want you can use other values for the Cx capacitor and for L1 inductor ( changing this value will affect the frequency oscillation and the detection range ).
Simple Touch Switch Circuit Using Transistor
A simple electronic touch switch can be constructed using this circuit diagram . This electronic touch switch is based on two transistors an can activate a relay , when the touch sensor is pressed .
[read here...]
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| Simple Touch Switch Circuit Using Transistor |
The touch sensor can be constructed using a small piece of a printed circuit board ( two small tracks with a 2 mm distance between each other ) . This circuit is powered using a 12 volts DC power supply , so the relay used for this project must be a 12 volts relay . This circuit is working very simple , when both plates of the sensor are touched the skin resistance will activate the circuit .
Wednesday, July 18, 2012
water level controller
water level indicator water level controller circuit diagram water level control schematic water level control circuit water level sensor circuit free automatic water level controller circuit water level meter schematic Water Level Sensor diagram water level indicator circuit design
Wednesday, July 4, 2012
2x15w stereo power amplifier circuits based TDA1521
It is small and compact stereo amplifier is powerful but can easily be used to replace your broken amplifier or new construction, or to make an active speaker, in all cases combined with a preamplifier. With remarkable features make it the true Hi-Fi amplifier.
Using only active component (the right and left channel) Philips TDA1521 monolithic integrated circuit, which contains a double line-end audio amplifier completely independent, each capable of providing from 10 to 12 W to the load 8 ohm or 15 W into 4 ohms (30 W music). Voltage gains of the amplifier is fixed at 30 dB.
Sunday, April 15, 2012
LM 3915 Sound Level Meter Circuit
This is a one chip sound level meter that can be use for displaying sound level of an amplifier or simply the sound level from a microphone.The heart of the circuit is IC LM 3915 Audio level IC.Even though it is a stand alone IC , a peak detector based on Transistor BC 558 and diode 1N4001 is also included for better performance.Supply voltage can be from 3V to 20V.The input is set for audio line voltage (1V peak to peak) and has a max input voltage of 1.3V. To make the circuit use a moving dot display instead of bar graph display,Pin 9 can be should be disconnected from +V.
Part List
C1 2.2uF 25V Electrolytic Capacitor
C2, C3 0.1uF Ceramic Disc Capacitor
R1, R3 1K 1/4W Resistor
R2 10K 1/4W Resistor
R4 100K 1/4W Resistor
R5 1M 1/4W Resistor
D1 1N4001 Silicon Diode
Q1 BC 558 PNP Transistor
LED1-LED10 Standard LED or LED Array
U1 LM3915 Audio Level IC
MISC Board, Wire, Socket For U1
Sunday, April 1, 2012
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These third-party ad servers or ad networks use technology to the advertisements and links that appear on wrojh.blogspot.com send directly to your browsers. They automatically receive your IP address when this occurs. Other technologies ( such as cookies, JavaScript, or Web Beacons ) may also be used by the third-party ad networks to measure the effectiveness of their advertisements and / or to personalize the advertising content that you see.
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You should consult the respective privacy policies of these third-party ad servers for more detailed information on their practices as well as for instructions about how to opt-out of certain practices. wrojh.blogspot.com's privacy policy does not apply to, and we cannot control the activities of, such other advertisers or web sites.
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[read here...]
Log Files
Like many other Web sites, wrojh.blogspot.com makes use of log files. The information inside the log files includes internet protocol ( IP ) addresses, type of browser, Internet Service Provider ( ISP ), date/time stamp, referring/exit pages, and number of clicks to analyze trends, administer the site, track user’s movement around the site, and gather demographic information. IP addresses, and other such information are not linked to any information that is personally identifiable.
Cookies and Web Beacons
wrojh.blogspot.com does use cookies to store information about visitors preferences, record user-specific information on which pages the user access or visit, customize Web page content based on visitors browser type or other information that the visitor sends via their browser.
DoubleClick DART Cookie
.:: Google, as a third party vendor, uses cookies to serve ads on wrojh.blogspot.com.
.:: Google's use of the DART cookie enables it to serve ads to users based on their visit to wrojh.blogspot.com and other sites on the Internet.
.:: Users may opt out of the use of the DART cookie by visiting the Google ad and content network privacy policy at the following URL - http://www.google.com/privacy_ads.html
Some of our advertising partners may use cookies and web beacons on our site. Our advertising partners include ....
Google Adsense
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These third-party ad servers or ad networks use technology to the advertisements and links that appear on wrojh.blogspot.com send directly to your browsers. They automatically receive your IP address when this occurs. Other technologies ( such as cookies, JavaScript, or Web Beacons ) may also be used by the third-party ad networks to measure the effectiveness of their advertisements and / or to personalize the advertising content that you see.
wrojh.blogspot.com has no access to or control over these cookies that are used by third-party advertisers.
You should consult the respective privacy policies of these third-party ad servers for more detailed information on their practices as well as for instructions about how to opt-out of certain practices. wrojh.blogspot.com's privacy policy does not apply to, and we cannot control the activities of, such other advertisers or web sites.
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Saturday, March 31, 2012
6Volt Doorbell Light Circuit
This 6V battery operated doorbell light circuit can be affiliated in alongside with any absolute AC230V doorbell. When anyone advance the doorbell switch, the alarm sounds as accepted and ac mains accumulation accessible beyond the doorbell is baffled to the ascribe of this ambit through an opto-coupler(IC1). Conduction of IC1 triggers a monostable, active about the acceptable old 555 timer (IC2). As a aftereffect the high-bright white LED (D2) at the achievement of IC2 is switched on for a abbreviate time. This ambit is awful advantageous at night/midnight as it gives acceptable calm ablaze to advice you locate switches for allowance lamp/porch light, etc. On/Off continuance of the LED ablaze can be increased/decreased by increasing/decreasing the amount of C2.
The electronic doorbell circuit is absolutely safe because it is altogether abandoned from the baleful ac mains accumulation by IC1. However, accumulate to abstain adventitious contacts with the foreground end of the circuit, which is anon affiliated to the ac supply. Use of a acceptable and acceptable ABS asylum is recommended for this doorbell ablaze unit.
Wednesday, March 21, 2012
Cable TV amplifier With 2 Transistors
This is a actual simple cable TV amplifier application two transistors. This amplifier ambit is a lot of acceptable for cable TV systems application 75 Ohm coaxial cables and works accomplished up to 150MHz. Transistor T1 performs the job of amplification. Up to 20dB accretion can be accepted from the circuit.T2 is active as an emitter addict to access accepted gain.Notes.
- The circuit can be assembled on a Vero board.
- Use 12V DC for powering the circuit.
- Type no of the transistors are not very critical.
- Any medium power NPN RF transistors can be used in place of T1 and T2.
- This is just an elementary circuit. Do not compare it with high quality Cable TV amplifiers available in the market.
Sunday, March 4, 2012
MSK5012 Adjustable Voltage Regulator 10A
MSK5012 is a awful reliable adjustable voltage regulator.Whose achievement can be programmed application two resistors. The regulator has a actual low dropout voltage(0.45v @10A )due to the acceptance of MOSFT with actual low Rds (ON) as the centralized alternation canyon element.The MS5012 has a top akin of accurateness and ripple bounce is about 45dB. It is accessible in a 5 pin Sip amalgamation that is electrically abandoned from the centralized circuitry. This accord us the abandon to fit the IC anon to the calefaction bore and this array of absolute heatsinking improves the thermal dissipation.
The achievement voltage of this circuit is adjustable from 1.3v to 36v DC.Resistors R1 and R2 are acclimated for programming the achievement voltage. For all applications, amount of R2 is anchored to 10K. The accord amid R1,R2 and achievement voltage Vout is according to the blueprint R1=R2(Vout/1.235)-1. C1 is a clarify capacitor which is aswell a allotment of the aboideau drive circuit of the centralized alternation canyon MOSFET. About three times the ascribe voltage will arise beyond this capacitor and so the its voltage appraisement have to be called accordingly.C2 is the ascribe clarify capacitor while C3 is the achievement clarify capacitor.
Wednesday, February 1, 2012
CLASS AB BJT 100W Hi-End AUDIO AMPLIFIER CIRCUITS
Symasym5, is a "cute" power amplifier, designed with quality but still low price in mind. This resulted in a ClassAB BJT amplifier, using only TO92 transistors for input and VAS, with a reasonable part count. The topology used is well known and consist of a single diffamp for input, plus a 2nd diffamp with current mirror for VAS. This is followed by normal darlington EF outputstage using modern high beta devices. The circuit uses large amounts of feedback over the whole audioband and an unconventional feedback compensation scheme. Right now symasym is designed to be driven directly from a CD/DVD-player, simply place a 22k poslog stereo pot between player and symasym. (as voltage divider)Update
The at least change is to reduce C14 from 22pF to 10pF, but i recommend to follow Pavel's advice.
I recommend C14 with 10pF also for MJLs, this increases safety margin.
Do not forget to read Pavel's Review! A very promising evaluation of the qualities to be expected from symasym. Thanks Pavel !
Another update are the resistors R31/32 to be increased from 22ohm to 47ohm. Symasym5_3 is an update of v5.2, with an improved board layout concerning power gnd,
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