Car Wiper Control Using 555 PCB

Circuit In rainy seasons, it is very annoying that wiper of your car wiping instantly all the time. Have you ever think of speed control of the wiper?.There are wiper control modules available on the market but most of them are costly. So here is an automatic wiper control circuit which enables you to control your wiper sweep rates from 1 second to 10 second. 

The heart of this circuit is an astable multivibrator using 555 Ic. We actually change the duty cycle of the square wave to obtain different sweep rates to control the wiper. The output pin 3 of the IC remains high for a time period set by R2. During this time the wiper motor will sweep at rates. The power supply to this wiper control circuit should be 12V. fit the potentiometer R2 anywhere on the dashboard of your vehicle and control the sweep rates according to the intensity of the rain.

Read More

100W Power Amplifier Circuit PCB

High Power Amplifier

Technical Specifications - Characteristics 100W Power Amplifier :

Output power (f=1 KHz, d=0.5 %): 100 W in 8 ohm

Supply voltage: ................ с 40 V

Quiescent current: ............. 50 mA

Maximum current: ............... 2.6 A

Sensitivity: . 600 mV

Frequency response: ............ 10-35000 Hz (-1 dB)

Distortion HD: ................. 0.01 %

Intermodulation dist.: ......... 0.02 %

Signal/noise: 83 dBConstruction

100W Power Amplifier Circuit Diagram :

L1 : 10 turns with wire 0,5mm turned on a restistor of 1W

If  you use a 4Ohm speaker you will place R3,4,17,23 at the board

If you use a 8Ohm speaker you will place D7 D8 and R28.

For R2 and R16 if you dont find a 0,47Ohm place two of 1 Ohm parallel.

R16 must be 0,47Ohm...the 1Ohm must be a typographical error, take care of this, i havent tested it.

Printed Circuit Board 100W Power Amplifier PCB:

If it does not work :

Check your work for possible dry joints, bridges across adjacent tracks or soldering flux residues that usually cause problems.  Check again all the external connections to and from the circuit to see if there is a mistake there.

- See that there are no components missing or inserted in the wrong places. 

- Make sure that all the polarised components have been soldered the right way round. - Make sure the supply has the correct voltage and is connected the right way round to your circuit. 

- Check your project for faulty or damaged components. If everything checks and your project still fails to work, please contact your retailer and the Smart Kit Service will repair it for you.

source:100W Audio Amplifier

Read More