Lamp-Switching Circuit Circuit


Posted on Sep 14, 2012

A normally open pushbutton switch (SI) delivers a positive input pulse to pin 4 of Ul, triggering the 1C into action. The output of Ul at pin 6 supplies base-drive current to a Darlington pair comprised of Q1 and Q2, activating . 10- capacitor and any resistor value of from 1 to 10 can be used as the timing components.To use the circuit on an auto`s headlights, connect the relay`s normally open contacts across the car`s headlight switch and press SI to extend the on time.


Lamp-Switching Circuit Circuit
Click here to download the full size of the above Circuit.

In connecting the circuit to control an ac-operated lamp, turn off the ac power and connect the relay contacts in parallel with the lamp`s power switch contacts.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Hee-haw
Oscilloscope-calibrator
Universal Compander
Video Master Circuit
There is an UART on the Nexus 4
Balanced Microphone Preamplifier
Yongnuo YN-460 Flash Remote Power Control
power inverter circuits
LTC1436ACGN-PLL High Efficiency Low Noise Synchronous Step-Down Switching Regulators
Circuit Project: Small Audio Amplifiers Using LM386 and NE5534
wien bridge oscillator distorted output
Resurrecting Tennis for Two a video game from 1958
2N6766 FET Derating Curve



Top