This is a hook up kit, for Stern SAM-based machines, that does all the hard stuff for you and turns the knocker installation into a twenty minute plug and play experience. I do not supply the knocker itself. You can get them anywhere. For my first test I took the knocker out of my Tommy, haha, and put it in my X-Men. I don't yet supply the Stern 50V step up board but I plan to. They are easy to get anyway, so if I can't organise supply then basically get a knocker unit and step up board from your favourite parts vendor, and this kit, and you'll be good.
The kit consists of two tap PCBs. One for the 50V coil power at J10, and another that combines Q24 and the 20V (required to allow the step up board to work) at J7. I know you can get Q24 at the coin door, but I've done this because it's better. It's cleaner, combining the 20V in the same tap, and if you want to keep your whole knocker setup in the back box then you can.
Here are the taps. The power tap has both pin8 and pin9 on it for two 50V supplies (I use this tap for my drop target power as well). Note that pin8 has a 4A fuse in it on the driver board, so you might want to change that to a 3A to match the fuse used for all the other coils. Both taps are correctly keyed.
Here is the power tap going into J10.
Here is the Q24 tap going into J7.
The cable harness. I have provided plenty of length if you want to mount your knocker in the main cabinet.
This plugs into the Stern 50V step up..
This goes back to the 50V tap..
This goes to the Q24 tap..
This goes to your knocker coil..
Put your knocker in..
Set the knocker settings in your menus and away you go. Note, to test your knocker don't use the Q24 test. Just use the main knocker test. With the knocker volume set to off, it still plays during the test, along with the real knocker, but when you get that first replay, bam, no chirp.
I plan on keeping these in stock at the website (which is now secure(yay!)) https://redshiftled.com.au but right now I only have very limited numbers in stock, due to a few annoying parts shortages. I should have more up within the week. Price is A$50 (about US$38). I won't actually have them activated on the site until tomorrow as it has just gotten too late to do it tonight.