High-power battery-operated flasher


Posted on Jun 17, 2012

This flasher operates from a 12-volt car or boat battery. It offers 36 to 40-watts output, variable flash rate (up to 60 flashes per minute), independent control of both on and off cycles and photoelectric night and day control that turns the flasher on at night and shuts it off during the day for automatic operation. SCR1 and SCR2 form a basic dc flip-flop. The lamp load is the cathode leg of one SCR so that the other side of the load may be at ground (negative) potential (required in some applications).


High-power battery-operated flasher
Click here to download the full size of the above Circuit.

The flip-flop timing is controlled by a conventional UJT oscillator arrangement (Ql, Rl, C3, etc.). Potentiometer R2 and diode CR1 provide on/off timing independence. Photoconductor PCI locks out the UJT firing circuit during the daylight hours.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

LED display Digital Calendar AT89C2051
Air-motion detector
Non-integer-programmable-pulse-divider
Voltage Doublers
MOSFET Driver circuits
zener Floating Voltage to Bias a P-Channel Mosfet without Exceeding Source-Gate Max Voltage
DC-Coupled Audio Amplifier Circuit
power supply variable with lm338
how to use rf module with arduino
new laser warning sticker
Crystal Oscillator
Modulated Light Barrier
Relay Sequencer Board
Variable PSU
RF Tester
LED Dance Pad
Simple VHF FM radio
Low phase noise voltage controlled oscillator circuit



Top