Time on delay help

119

01:34:08

I want a circuit that delays before switching a relay. But resets when power is turned off. I can't get nothing to work. Any ideas.

published 10 years ago

phydeaux

10 years ago

Are you trying to accomplish something real world?

MattFerrie

10 years ago

Are you talking about something that can be accomplished with a monostable 555 timer?

covertfrenchie

10 years ago

Yes real world. Connect power, timing starts, when time limit is reached led turns on. When power is disconnected led goes off. The problem i am having is if power is disconnected before time is reached the capacitor still has a charge and the circuit acts as a retentive timer.

covertfrenchie

10 years ago

MattFerrie i tried the monostable 555 but it operates as on immediately then delay off.

MattFerrie

10 years ago

Try using an inverter on the output

jpoulin0901

10 years ago

Just buy a TDOE relay. They should be cheap surplus.

chuch82

9 years ago

How much time u want the delay?

aastha22

9 years ago

If i want a delay of 10 seconds then what to do....using

aastha22

9 years ago

Plus i want a command there....using variable resistor if we can change delayed time by varying the resistance value

myrddin22

8 years ago

Try this. Can't take credit, found it online somewhere and just diagramed it up here: http://everycircuit.com/circuit/6052668008300544

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