I've completed the PCB design for the solenoid driver. This board can be used with the AimTrak to drive any 24VDC solenoid, not just the Namco solenoid. This circuit is a bit different from my initial posting. There is absolutely nothing wrong with the first and much simpler version of this that I posted. However for the kit, I've designed it as an opto-isolated circuit for greater isolation of the driver circuit from the AimTrak. I realize this is entirely overkill.
Designing a PCB makes it a snap for installation (no soldering or splicing)... to accomplish this it has been given two connectors...
- A 9Pos .100 connector with connections for the solenoid coil, 24VDC+/- with pass through of the AimTrak connections Ground, P1, Aux and Trigger. I decided to do the pass through on the AimTrak lines of Ground, P1, Aux and Trigger to make it easier connecting to external switches. Doing this affords me the capability of using 20-24AWG wire as the AimTrak connector uses a very light gauge wire that is a bit tricky to use with quick disconnects.
- A 5Pos 2.00mm connector that will directly connect (with harness of course) to the AimTrak's P1 1.25mm connector.
In the event the coil you are using does not have the kick-back diode in-line with the connector (like the Namco does), I've included a placeholder on the PCB for installation of that diode.