Time-Delay Photo-Flash Trigger


Posted on Jan 20, 2013

Ql is a phototransistor that is normally illuminated by a beam of light. When the beam is intercoupled, pin


Time-Delay Photo-Flash Trigger
Click here to download the full size of the above Circuit.

1 of U1A goes high, and forces pin 4 U2B low. Then, C2 discharges through R2 and R3. After a certain time delay, pin 10 U1C goes high, triggers SCR1, and sets off the flash. R4/C1 charges, causes U1D output to go low after about 1h second, and resets U1A and U1B to the initial state. This delay prevents accidental double flash exposure.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Audio amplifier 2X18W
2-30Mhz-amplifier
Modulated Light DX
tv transmitter circuit 17
RF-AMP Documentation
Water AlarmCircuit
MAGNETOSTRICTION TV REMOTE CONTROL
Dance hall circuit automatically fill light



Top