555 time bomb

338

05:59:17

1 stage principle of an up and down counter 0->9 and 9->0
Adding more is analog

It got several handy features:

Choice switch impulse triggered automatic UP DOWN
on off
Pause impulse while holding 
impulse on off
Manual up
Manual down
Manual reset

The relay cut the connection to to Impuls source and It shuts off at ZERO !
Red light is on and stays on.

If you like you can alter this circuit your way.

published 11 years ago

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