Showing posts with label FM TRANSMITTER. Show all posts
Showing posts with label FM TRANSMITTER. Show all posts
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.
Friday, November 25, 2011
200M FM Transmitter Simple Circuit
FM transmitter circuit very stable and simple given here. With an adaptive antenna, the transmitter can reach a range of about 200 meters. Transmitter met this year and got a few good results. Let's see how the circuit.
A condenser microphone (K1) is used to collect the sound transmitted. The capacitor C1 is a DC decoupler and the audio signal is coupled to the base of Q1 which connects a preamplifier.R2 and R3 are the resistances of polarization of Q1. Amplified sound signal will be available at the collector of Q1 and, together with the emitter of transistor Q2 through capacitor C4 and inductor L1 1mH.
C4 capacitor decouples the DC component of the preamplifier output. Q2 does the work of the oscillator and modulator. Inductor L2 and capacitor C5 variable tank circuit is necessary to create oscillations. Capacitor C6 is the feedback capacitor. The FM modulated wave will be available at the collector of Q1 and is transmitted through the antenna A1.
A condenser microphone (K1) is used to collect the sound transmitted. The capacitor C1 is a DC decoupler and the audio signal is coupled to the base of Q1 which connects a preamplifier.R2 and R3 are the resistances of polarization of Q1. Amplified sound signal will be available at the collector of Q1 and, together with the emitter of transistor Q2 through capacitor C4 and inductor L1 1mH.
C4 capacitor decouples the DC component of the preamplifier output. Q2 does the work of the oscillator and modulator. Inductor L2 and capacitor C5 variable tank circuit is necessary to create oscillations. Capacitor C6 is the feedback capacitor. The FM modulated wave will be available at the collector of Q1 and is transmitted through the antenna A1.
Sunday, August 7, 2011
1 Watt Portable FM Transmitter
This Simple Portable FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning. All the components are placed on one circuit board. The RF power is switchable between 1 W (HI) and 0,2 W (LO).The schematic diagram is split into 3 parts: RF part (numbered from 1), PLL (numbered from 30) and audio part (numbered from 50). Connect a 6 V / 0,1 A bulb to the output and set the correct frequency on PLL. Set the RF power to HI. currently activate the transmitter. you must tune it on a receiver. perhaps you may stretch coils of the L1. Fix the L1 in position when the tuning voltage (on Q3) is in range 4-9 V. Then use C15, C16 and C17 to regulate the best power (the highest light of the bulb). Then you'll be able to connect antenna and audio signal. change R1 till the audio sounds as loud because the alternative stations.
Technical specifications 1 Watt Portable FM Transmitter
Supply voltage: 12 V from accumulator or regulated power supply
Supply current (HI/LO): 270/170 mA
RF power HI: 1 W
RF power LO: 0,2 W
Impedance: 50-75 ohm
Frequency range: 87,5-108 MHz
Modulation type: wide-band FM
Modulation inputs: line, mic, RDS/MPX
PCB dimensions: 11,3 x 8,8 cm
Friday, July 22, 2011
12 watt FM Transmitter circuit
12 watt FM Transmitter circuitThe advantages of FM modulation is free from the influence of the disturbance of air, bandwidth (broadband) is larger, and the high fidelitas. Compared to the AM system.
FM transmitter is a modification of the FM transmitter on the market (s Saturn type 038). several series of modifications and additions can produce energy Boster number to about 12 watts.
of the series after this work is quite good, the signal generated is stable and strong enough
time in no hurry to do it directly, but usually do each part in sequence so that the error may be earlier
the first part of the work is in the oscillator, after the raft can try to turn radio waves in free mode and set the radio volume so clearly audible hiss. turn the core Koker whistle on the radio is, if you get a signal in a robust and stable set of oscillator has been working with both.
the next section can start at the raft, after the end of the second set trimer (C8 and C11) in the buffer, in turn can feed even the largest steel cables and the older children. If the series works well, there are approximately 0.25 watts
for more resources that can be added over the wider range Boster 12 watts, so the distance will be increased to up to seven times.
FM transmitter is a modification of the FM transmitter on the market (s Saturn type 038). several series of modifications and additions can produce energy Boster number to about 12 watts.
of the series after this work is quite good, the signal generated is stable and strong enough
time in no hurry to do it directly, but usually do each part in sequence so that the error may be earlier
the first part of the work is in the oscillator, after the raft can try to turn radio waves in free mode and set the radio volume so clearly audible hiss. turn the core Koker whistle on the radio is, if you get a signal in a robust and stable set of oscillator has been working with both.
the next section can start at the raft, after the end of the second set trimer (C8 and C11) in the buffer, in turn can feed even the largest steel cables and the older children. If the series works well, there are approximately 0.25 watts
for more resources that can be added over the wider range Boster 12 watts, so the distance will be increased to up to seven times.
Tuesday, July 5, 2011
Fm transmitter 88-108Mhz - IC MAX2606
Fm transmitter 88-108Mhz - IC MAX2606Note:
* Use a battery for powering the circuit.It will reduce noise.
* An FM antenna from a old radio is a better option than the wire antenna.
IC MAX2606 Description
The MAX2605, MAX2609 are compact, high performance intermediate frequency (IF) voltage-controlled oscillator (VCO) designed specifically for demanding portable wireless communication systems. They combine monolithic construction with low noise, low operating power consumption of a small 6-pin SOT23 package.
Low-noise VCO, a feature on-chip varactor and feedback capacitors that eliminate the need for external adjustment elements, so the ideal MAX2605, MAX2609 for portable systems. Only an external coil is needed to establish the frequency of oscillation. In addition, a buffer integrated differential output is provided for driving a mixer or prescaler. The output buffer is capable of providing up-8dBm (differential) with a simple power game. It also provides isolation from load impedance variations.
The MAX2605, MAX2609 operate from a single 2.7 V to 5.5 V supply and provides low power consumption. IF these oscillators can cover the frequency range of 45MHz to 650MHz.
IC MAX2606 Absolute Maximum Rating- VCC to GND..............................................................-0.3V to +6V
- IND to GND ................................................-0.6V to (VCC + 0.3V)
- TUNE to GND .............................................-0.3V to (VCC + 0.3V)
- OUT+, OUT- to GND ..................................-0.3V to (VCC + 0.6V)
- Continuous Power Dissipation (TA = +85°C)
- 6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW
- Operating Temperature Range ...........................-40°C to +85°C
- Junction Temperature......................................................+150°C
- Storage Temperature Range .............................-65°C to +150°C
- Lead Temperature (soldering, 10s) .................................+300°C
Tuesday, June 14, 2011
3Volt FM Transmitter for 88MHz to 108MHz
3Volt FM Transmitter for 88MHz to 108MHzThe important allotment of the circuit is formed of the Colpitts blazon oscillator. C3,C4,C5,C6,CD1-CD2 and L1 determines the frequency. BF982 and bifold aboideau MOSFET are alive genitalia in oscillator. When the ascribe impedance of the MOSFET aboideau inputs are high, LC catchbasin is not affected. However transistors force the LC catchbasin and account appearance shift.
Two disciplinarian stages are added to abstract the antenna from oscillator. First date (BF199) amplifies the low arresting of the oscillator and works as a connected load. The additional date (BFR90) amplifies the arresting activity through the antenna some more. A abbreviate chestnut wire can be acclimated as an antenna here. Attaching a ample antenna to this ambit is accidental because the achievement ability is low.
Notes:
1. Coil 1: Winding wire must be 1 mm thick and isolated. Number of turns: 3.5 . 5mm core must be used and the distance between each turn must be 1mm.
2. You can use BF199 instead of BFR90.
3. If you can't find the varicap diode, you can use MV104 instead.
Two disciplinarian stages are added to abstract the antenna from oscillator. First date (BF199) amplifies the low arresting of the oscillator and works as a connected load. The additional date (BFR90) amplifies the arresting activity through the antenna some more. A abbreviate chestnut wire can be acclimated as an antenna here. Attaching a ample antenna to this ambit is accidental because the achievement ability is low.
Notes:
1. Coil 1: Winding wire must be 1 mm thick and isolated. Number of turns: 3.5 . 5mm core must be used and the distance between each turn must be 1mm.
2. You can use BF199 instead of BFR90.
3. If you can't find the varicap diode, you can use MV104 instead.
2 Transistor FM Transmitter
2 Transistor FM TransmitterI accept acclimated a brace of BC548 transistors in this circuit. Although not carefully RF transistors, they still accord acceptable results. I accept acclimated an ECM Mic admit from Maplin Electronics, adjustment cipher FS43W. It is a two terminal ECM, but accustomed activating mic inserts can additionally be used, artlessly omit the advanced 10k resistor. The braid L1 was afresh from Maplin, allotment no.
UF68Y and consists of 7 turns on a division inch artificial above with a affability slug. The affability bang is adapted to tune the transmitter. Actual ambit on my ancestor acquainted from 70MHz to about 120MHz. The aeriform is a few inches of wire. Lengths of wire greater than 2 anxiety may clammy oscillations and not acquiesce the ambit to work. Although RF circuits are best complete on a PCB, you can get abroad with veroboard, accumulate all leads short, and breach advance at adapted points.
One final point, don't authority the ambit in your duke and try to speak. Body capacitance is agnate to a 200pF capacitor shunted to earth, damping all oscillations. I accept had some aboriginal duke acquaintance of this problem. The abundance of cadence can be begin from the approach section,and an archetype now appears in the Ambit Analysis section.
1 Watt Four Stage FM Transmitter
1 Watt Four Stage FM TransmitterThis FM transmitter circuit uses four radio abundance stages: a VHF oscillator congenital about transistor BF494 (T1), a preamplifier congenital about transistor BF200 (T2), a disciplinarian congenital about transistor 2N2219 (T3) and a ability amplifier congenital about transistor 2N3866 (T4). A condenser microphone is affiliated at the ascribe of the oscillator.
Working of the 1 Watt transmitter ambit is simple. When you allege abreast the microphone, frequency-modulated signals are acquired at the beneficiary of oscillator transistor T1.
The FM signals are amplified by the VHF preamplifier and the pre-driver stage. You can additionally use transistor 2N5109 in abode of 2N2219. The preamplifier is a acquainted class-A RF amplifier and the disciplinarian is a class-C amplifier. Signals are assuredly fed to the class-C RF ability amplifier, which delivers RF ability to a 50-ohm accumbent dipole or arena even antenna.
Use a heat-sink with transistor 2N3866 for calefaction amusement (Note: or 2N4427 because it works bigger at 12 V and delivers up to 1 watt RF power). Carefully acclimatize trimmer VC1 affiliated beyond L1 to accomplish abundance aural 88-108 MHz. Additionally acclimatize trimmers VC2 through VC7 to get best achievement at best range.
Regulator IC 78C09 provides abiding 9V accumulation to the oscillator, so aberration in the accumulation voltage will not affect the abundance generated. You can additionally use a 12V array to ability the circuit. Assemble the ambit on a accepted purpose PCB. Install the antenna appropriately for best range.
Coils L1 through L5 are fabricated with 20 SWG copper-enameled wire anguish over air-cores accepting 8mm diameter. They accept 4, 6, 6, 5 and 7 turns of wire, respectively.
Thursday, September 9, 2010
FM Transmitter 4Watt
TECHNICAL CHARACTERISTICS:
Stabilised tendency of catering: Vcc=12~16V
Frequency of emission: 88~108MHz
Consumption: 100~400mA
Stabilised tendency of catering: Vcc=12~16V
Frequency of emission: 88~108MHz
Consumption: 100~400mA
Circuit diagram:
Materially:
The resistors are 1/4W.
R1, R2 10KOhm
R3 47Ohm
C1, C2 1nF
C3 4,7uF/16V
C4, C7, C8 0~45pF trimmer
C5, C6 10pF
C9 100nF
L1 4 turns, 7mm diameter *
L3 3 turns, 7mm diameter *
L4 5 turns, 7mm diameter *
L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit.)
T1, T2 2N2219
ANT Simple dipole l/2.
MIC IN Microphone dynamic or other type. (It can also connected to a cassette player unit)
* The inductors is air from wire of coaxial 75W or other 1mm roughly.
The resistors are 1/4W.
R1, R2 10KOhm
R3 47Ohm
C1, C2 1nF
C3 4,7uF/16V
C4, C7, C8 0~45pF trimmer
C5, C6 10pF
C9 100nF
L1 4 turns, 7mm diameter *
L3 3 turns, 7mm diameter *
L4 5 turns, 7mm diameter *
L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit.)
T1, T2 2N2219
ANT Simple dipole l/2.
MIC IN Microphone dynamic or other type. (It can also connected to a cassette player unit)
* The inductors is air from wire of coaxial 75W or other 1mm roughly.
PCB:
Before you print it out with microsoft paints, set the screen resolution to 1280 by1024 in order to get the correct scale
Before you print it out with microsoft paints, set the screen resolution to 1280 by
Regulations:
With the C4 we regulate the frequency.
With their C7, C8 we adapt the resistance of aerial (practically to them we regulate so that it is heard our voice in the radio as long as you become cleaner).
With the C4 we regulate the frequency.
With their C7, C8 we adapt the resistance of aerial (practically to them we regulate so that it is heard our voice in the radio as long as you become cleaner).
Notes:
The T2 wants refrigerator.
The T2 wants refrigerator.
Wednesday, June 23, 2010
FM Stereo Transmitter ( BH1415F )
This Electronic circuit is a stereo FM Transmitter based on BH1415F wireless audio link IC. Phase Locked Loop (PLL) controller use PIC16F628 and the the PLL frequency programming can be displayed with 8x2 and 16x2 LCD. Frequency Range 88-108 MHz
Thursday, October 22, 2009
STEREO FM TRANSMITTER WITH I.C. BH1417
This is the latest BH1417 Stereo Encoder design from RHOM that includes a lot of great features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference and crystal based stereo encoder for stereo transmission.
BH1417 can be supplied with 6 - 15V voltage, consumes only around 25mA while providing very sound quality and improved 40dB channel separation. BH1417 is only available in SOP22 IC case and this may be an inconvenience for some folks.
On the other hand, because the chip is smaller than regular DIP-based ICs it is possible to fit the entire stereo coder on a small PCB.
BH1417 requires 7.6MHz crystal oscillator which is pretty hard to find. The good news is that you can use 7.68 MHz crystal instead. In fact our BH1417 stereo encoder prototype uses 7.68 MHz crystal.
This has absolutely no effect on stereo encoding process, we have tested it and stereo sound is crystal clear.
Specifications:
Supply Voltage: 9 - 16V
Transmission Frequency: 87.7 - 88.9MHz, 106.7 - 107.9MHz (200kHz steps)
Output RF Power: 20mW
Audio Frequency: 20 - 15KHz
Separation: 40dB
Power Consumption: 30mA
Frequency Selection / Calibration
Frequency selection is very straight forward. Simply select transmission frequency at which you would like to transmit, set the combination for 4-DIP switch and BH1417 will immediately tune to that frequency. If you can't hear the transmitted audio signal on your FM receiver then re-adjust 2.5 turn variable coil until you can hear the signal. If you have a laboratory power supply you may try to vary the voltage supply from 9 to 16V. While doing that BH1417 will automatically vary the voltage for MV2109 or ZMV833ATA varicap diode making sure that there's no frequency drift.
Saturday, October 3, 2009
Sunday, April 26, 2009
3 V FM TRANSMITTER
A very nice simple and useful circuit diagram of an FM transmitter is sown in this schematic . This FM Transmitter software is very simple and it has a acceptable transmission . The signal transited from this FM transmitter can be received at almost 300 meters in open air The circuit require a 3volts operating voltage and can be tuned anywhere in the FM band.
You can use this emitter circuit to transmit signal from your house to garden or from room to room . To listen the signal you can use any radio (portable or not ) that can work on FM band .
Connect a half or quarter wavelength antenna (length of wire) to the aerial point. At an FM frequency of 100 MHz these lengths are 150 cm and 75 cm respectively.
The calibration of this FM emitter circuit is very simple and you need just to place a radio at some distance from the transmitter and set it somewhere about 88-107MHZ( chose the transmission frequency ) and after that vary the transmitter oscillator frequency , by modifying the value of the capacitor . The transmission frequency is set to the desired frequency just when you can hear the transmitted signal.
Subscribe to:
Posts (Atom)