Showing posts with label the. Show all posts
Showing posts with label the. Show all posts
Sunday, May 5, 2013
Three Flashing LED Doorbells For The Hearing Impaired
When
the push switch is operated - the buzzer will sound and the LEDs will
begin to flash. For the hearing members of the household - the buzzer
acts as a regular doorbell. It also re-assures the visitor that the
doorbell is working.
When the push switch is released the buzzer will stop - but the LEDs will continue to flash. The length of time they will go on flashing is set by the values of R2 & C1. With the values shown in the diagram - the LEDs will flash for a further 30 seconds or so. If you make R2 a variable resistor, you can adjust the time period. If you want longer than 30 seconds - increase the value of C1 or R2.
When the push switch is released the buzzer will stop - but the LEDs will continue to flash. The length of time they will go on flashing is set by the values of R2 & C1. With the values shown in the diagram - the LEDs will flash for a further 30 seconds or so. If you make R2 a variable resistor, you can adjust the time period. If you want longer than 30 seconds - increase the value of C1 or R2.
The
main difference between this circuit and the last one - is the
addition of the two transistor switches. The switches will each flash up
to 15 groups of 3 LEDs. And - because they are getting power directly
from the battery - the LEDs will glow at their full brilliance.
Monday, April 8, 2013
Fuse Box Chevy Tracker Under The Dash 2001 Diagram
Fuse Box Chevy Tracker Under The Dash 2001 Diagram - Here are new post for Fuse Box Chevy Tracker Under The Dash 2001 Diagram.
Fuse Panel Layout Diagram Parts: power window, dome light, license plate light, marker light, instrument panel illumination, hazard light, sensor heater, cruise control, ignition coil, meter, G sensor, cigar lighter, power mirror, door lock, brake light, horn, center high, mounted stop lamp, rear window defogger, turn signal, back up light.
[read here...]
Fuse Box Chevy Tracker Under The Dash 2001 Diagram
Fuse Panel Layout Diagram Parts: power window, dome light, license plate light, marker light, instrument panel illumination, hazard light, sensor heater, cruise control, ignition coil, meter, G sensor, cigar lighter, power mirror, door lock, brake light, horn, center high, mounted stop lamp, rear window defogger, turn signal, back up light.
Tuesday, April 2, 2013
Solve buzzing and noise on the amplifier circuit
Power amplifiers that we sometimes raises a raft of small drone as groundingless than perfect.The following are some ways to cope with the hum of the power amplifier:
1. Keep sensitive circuits of the transformer, casing dimensions are not too small.One blog even suggested to use two-bok, bok special one for the transformer. For the toroid transformer or amplifier with a large transformer, should only contain a series of power amps, with no tone control.
2. Change the position of the transformer, side by side into the lower side (the transformer is high) withfacing a series of sensitive posts
3. Use a spacer on each PCB board as high as half the height of the transformer, eg as high as 2.5 cm or more so that the PCB board parallel to the core / center of the transformer, here the effect of the weakest fields.
4. We recommend using a stereo module instead of two mono modulesThis avoids wiring errors. If forced to, try to sizecable between the right and left modules as long and as short as possible.
5. Should take the ground path for the speaker of ct ct elco instead of the transformer,if the board pcb mounted two big elco (like elco power supply), takeground path of the speakers here, and check to hear!
6. Power supply for radio (TX or RX) is very sensitive, use a capacitor4x100nf, 4 pairs of these capacitors in parallel to each mem-diode (bridge).
7. At the tone control circuit IC op-amp that uses a symmetric power supply,sufficient ground wiring is taken from the signal ground wires only. shouldIC power supply (7812) installed near the main power supply, notmounted near the tone control.
8. Always use a stereo cable shrouded perfect (color stereo cablered-white-covered ground and wrapped in transparent skin.
9. For power supply, use capacitors of 2200uF per ampere elco
10. Zoom and ground wires as short as possible, especially a pair of elco (ct line between elco) power supply (can be tried for the amplifier blazer)
11. For the amplifier should be mounted to the computer casing when not in the ground soil is diground PC casing soil
12. Pairs of each kit to the circuit without passing groundnya nut / baud / spacer. Do not let the existing ground line at the hole pcb connected to the casing / box. Do not follow this ground. ground attached to the casing should have one. if necessary use a plastic spacerovercome the noise:
1. Use the active component (IC) that qualified as TL084, TL074, notLM324. LM324 any brand of noise. TL084 is more guaranteed authentic yellow (ST), not white. For now, the IC TL084 is printed white-work unstable frequencyhigh (treble breaks and more noise). For IC 4558 (NE5532) use plain white silk screening JRC4558D or TL072 - TL082 yellow, LF353 noise. LM741 (NE5534) can be replaced with the Hitachi HA17741, LF351 noise may also, has never been tried.we do not have to look for the brand and the price is more expensive because it is the most low noise.
2. If necessary, the circuit power amplifier OCL, lowering its gain by lowering the value ofresistor in the path gain from 33k to 22k speaker, mimics the gain-clone lower amplifier noise.
3. Should simplify the circuit, the circuit is too complex is more susceptible to noise and interference.
4. Should then potentio / volume mounted on the input-power amplifier, such as professional amplifier without tone control.
Thursday, March 21, 2013
Balanced Output Board For The Stereo DAC
This add-on board is designed to provide a pair of balanced audio outputs for the High-Quality Stereo DAC (Digital to Analog Converter). Two 3-pin male XLR connectors are used for the new outputs and they can either replace or augment the existing unbalanced outputs without affecting their performance. Balanced audio is used in recording studios and on stage because of its improved noise immunity.
Picture of the project:
This is due to the fact that the signal is sent differentially (ie, as two signals 180° out of phase) and then converted to a single-ended voltage signal at the far end. If any noise is picked up in the cable, it affects the two out-of-phase signals equally so that when the signals are subsequently subtracted, most of the noise is eliminated.
Parts layout:
In addition, the DAC’s performance at the balanced outputs generally exceeds that of the unbalanced outputs, although only by a small margin. The signal-to-noise ratio, frequency response and channel separation are all better, although we measured a tiny bit more distortion from the balanced outputs. However, both levels are so low as to be almost negligible.
Circuit diagram:
Comparison chart:
Source : www.siliconchip.com
Wednesday, January 16, 2013
The 1999 GMC 1500 Sierra Pickup Front Drive Axle System Components Parts Diagram
The 1999 GMC 1500 Sierra Pickup is powered by a 4.3 liters / 262 CU. in. pushrod overhead valve V6 engine in paired with 5-speed manual transmission system, produces 200 HP power at 4600 rpm and 260 Nm torque 2800 rpm.The following diagram / schematic shows the 1999 GMC 1500 Sierra Pickup Front Drive Axle System / Parts / Components Diagram. (click image to enlarge)
The 1999 GMC 1500 Sierra Pickup Front Drive Axle System / Components / Parts Diagram
- Output Shaft
- Axle Assy
- Deflector
- Output Shaft Seal
- Output Shaft Bearing
- Tube
- Engagement Switch
- Actuator
- Washers
- Connector
- Sleeve
- Shim
- Fork Shaft
- Spring
- Fork
- Inner Shaft
- Axle Housing
- Insert
- Sleeve
- Side Bearings
- Differential Case
- Ring And Pinion
- Pinion Shaft
- Side Washer
- Pinion Gear
- Front Pinion Bearing
- Spacer
- Rear Pinion Bearing
- Pinion Seal
- Deflector
- Companion Flange
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