MrDEB
Well-Known Member
Needed a delay ON circuit that turns on a 60W transformer BUT I have a 12v DPDT relay and a 5V SPST relay.
Idea is the SW1 is depressed thus activating 5V relay (the relay stays ON for 8-10 seconds)that turns on the transformer
Transformer ON turns on the power for the PIC via the 7805
The PIC enables the 2n3904 to keep the power to the 7805/PIC
When the PIC output turns OFF the entire circuit turns off including the transformer.
This is a temp controlled soldering iron w/ auto shut off after non usage of 10 minutes.
Yes I know I could have used a SSR but then HEAT rears its head.
In theory this circuit should? work but there should be an easier way?
Idea is the SW1 is depressed thus activating 5V relay (the relay stays ON for 8-10 seconds)that turns on the transformer
Transformer ON turns on the power for the PIC via the 7805
The PIC enables the 2n3904 to keep the power to the 7805/PIC
When the PIC output turns OFF the entire circuit turns off including the transformer.
This is a temp controlled soldering iron w/ auto shut off after non usage of 10 minutes.
Yes I know I could have used a SSR but then HEAT rears its head.
In theory this circuit should? work but there should be an easier way?