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Timers and
Counters Circuits, Page 2c Timers & Counters:
#-A
Previous B-EF-LM-S T-Z Last Updated on:
Monday, October 03, 2011 06:08 PM
Circuits
Designed by Dave Johnson, P.E. :
CIRCUIT
FORMS DIVIDE BY 1.5 COUNTER
Two inexpensive ICs divide a TTL clock signal by 1.5. By following the circuit with
another flip/flop, you could also generate a divide by three function.
DARKROOM
CAMERA SHUTTER TIMER
This circuit was designed to control a film exposure shutter for a darkroom. It has
8 time steps ranging from 0.35 seconds to 4 seconds. It is activated by a foot
switch and draws power from an external 12 volt DC supply.
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