A while back with help from pinside I made a DIY Added Ball kit K-313 for my Rocket III. It worked great, basically an extra relay with Jones plug that replaces a jumper plug on the motor board, it looks like this;
The original thread is here - https://pinside.com/pinball/forum/topic/bally-rocket-iii-apron-credit-lamp-wiring
Shortly thereafter beadwindow worked something very similar for Minizag - https://pinside.com/pinball/forum/topic/bally-minizag-aab
These DIY kits have worked great and Added Ball/Shoot Again is a fun option in the home play environment. The problem is part of the fun has been lost as the Knocker doesn't function in Added Ball mode and knocker = pinball. This is by design as the knocker/sounder is driven by the Replay Unit End of Stroke and the Replay Unit is no longer in use once the AAB kit is installed as Replay/Credits are no longer awarded.
Would there be an easy way to wire a Knocker to the AAB kit relay to knock when an extra ball is awarded? The challenge is that the AAB relay is a hold type relay that holds when AAB is awarded (based on score threshold) until it releases when the added ball is shot via the top arch rebound gate nc switch. I can wire an extra switch to the relay to activate the knocker but then it would stick on (and burn up) until the AAB relay releases. How can I make the pulse to the Knocker momentary? If possible to extend the AAB kit and not alter original wiring.
The Rocket III schematic is available on IPDB the AAB Relay at B44;
I can provide a version with all AAB circuitry highlighted if that helps.
Thank you for any and all assistance.