Zero Current Standby 25 Sec Timer

159

02:29:01

Takes no current on standby momentary long term use  unit will power down when timed out you can put small beeper next to the led and ground  if don't need high current drive you can remove lamp drive transistor and base resistor and run unit on a 9 volt PP3 battery 

For 10 mins change timing 470 uf  to 1000 uf and 47k to 600k 

The bottom switch is power down 

Scope the Ammeter to see Current Drain

published 10 years ago

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