A
simple time switch continuously adjustable between 0 and 5 minutes. Suitable
for alarms, photographic laboratories etc. It uses the well known timer
IC 555. It has a relay capable of handling up to 250V/2 A. This circuit
can replace commercial time switches at a fraction of the cost. Supply voltage:
12 VDC. Suitable power supply is the SMART KIT 1061. Max.current:
50mA. Delay time: 0-5 mins.