The 12V solenoid has to wires and depending on polarity can be used to make it push or pull. I would like to utilize a push button that I will attach to the control panel to activate the circuit using the 12V battery on the generator, allowing it to energize the solenoid to pull the choke closed.
(Battery Specs: Cycle Use: 14.5-14.9V Standby use: 13.6 -13.8V Initial Current: Less than 6.8A)
The circuit design must not drain the battery when not in use.
I plan on building a circuit board using your schematic and placing it in a waterproof case.
If you can help, I would appreciate it.
Feedback from Mr. Bob
Thank you for your time and the schematic. People such as yourself, make the internet a valuable resource.
Just a couple of questions:
1) Can the 2.2Meg resistor be replaced with a trimmer pot to vary the time or should I only vary
the two 1000uf caps only?
2) Do I connect the positive ends of both capacitors to the positive lead of solenoid and negative
lead of solenoid to ground?
1) Yes the 2.2m resistor can be replaced with a preset, the value is not critical you can even try a 1M preset and simultaneously try experimenting with 1000uF cap which is connected with the 2.2M resistor (it's a single capacitor). Both values together (2.2M and 1000uF) or individually can be tweaked for getting the desired delay.
Make sure you add a 10k resistor in series with the preset (transistor base) to safeguard the transistor.
2) You can either connect the positives of the capacitors "towards" the solenoid or the negatives "towards" the solenoid, no other combination should be tried, basically we are trying to implement a non-polar capacitor here...therefore alternatively you can procure a non-polar 500uF/25V capacitor and connect it in series with any one wire of the solenoid anyway round.
The solenoid wire connections (polarity) becomes crucial only with the relay contacts once the above cap assembly is done, the above cap assembly becomes a part of the solenoid.
The slenoid wire polarity can be confirmed simply by operating the mechanism, if it moves oppositely... just swap the wire across.