Hi all
I have a circuit that I can not seem to configure to do as I would like ... I would like a GND pulse from a N/O push button to toggle on the 555. The 555 will trigger a 12V relay, sending power ONLY to my vechicles dash/gauges. (Please note the dash power and the vehicles 12v Ignition is separate.) When I move the ignition key forward, turning on the vehicles Ignition circuit. The 555 chip turns off. Allowing the vehicles ignition circuit to supply the Dash its power. The 1st circuit I attached to this post accomplishes this task I mentioned above. ... BUT .... I would like the GND pulse from the push of the N/O Power button to activate AND another push to deactivate the 555 circuit. PLUS, have the vehicles 12V ignition also deactivate the 555 circuit.
I did try to use a PNP BD140 to shunt across the SET and RESET triggers of the 555 circuit. (See drawing 2)
In my SIM the BD140 works, but not on my bread board.
I am asking for guidance to accomplish what I am looking for.
Thank you,
TONY
I have a circuit that I can not seem to configure to do as I would like ... I would like a GND pulse from a N/O push button to toggle on the 555. The 555 will trigger a 12V relay, sending power ONLY to my vechicles dash/gauges. (Please note the dash power and the vehicles 12v Ignition is separate.) When I move the ignition key forward, turning on the vehicles Ignition circuit. The 555 chip turns off. Allowing the vehicles ignition circuit to supply the Dash its power. The 1st circuit I attached to this post accomplishes this task I mentioned above. ... BUT .... I would like the GND pulse from the push of the N/O Power button to activate AND another push to deactivate the 555 circuit. PLUS, have the vehicles 12V ignition also deactivate the 555 circuit.
I did try to use a PNP BD140 to shunt across the SET and RESET triggers of the 555 circuit. (See drawing 2)
In my SIM the BD140 works, but not on my bread board.
I am asking for guidance to accomplish what I am looking for.
Thank you,
TONY
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