Quoted from BENETNATH:Steve45 : can you confirm this wiring ? I have a 5V relay board for arduino, a 12V shaker and a 5V DC power unit. The shaker is well driven by the power unit so i would give a try. I am not familiar with these boards.
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We would really need a place to set up a documentation, would you open a wiki on the pinball-mods page or something like that ? A lot of people are interested but we are relying a lot on your replies. Keep it up !!
Not sure want's so complicated with controlling a relay with a gpio pin that is available on a header marked with TX. Not sure want kind of relay card you have on your picture but there are relay cards out there that can be directly controlled by a 3.3 V gpio output pin from a pi. That's what I have used. I posted the general approach a few post above.
All the rest: like power from a switched power supply, a PWM regulator for motor speed, the motor itself has nothing to do with RasPiSound directly. You can (and should) test this independently. If you're not sure about the relay, check specifications or test with a dmm. GPIO from pi is limited to 3.3V and about 16mA.
If you want to write an article and publish something on pinball-mods.de I will publish it, or get you an account. Just send me your stuff, no problem with that. Or use some free project hosting service like https://ourproject.org/ or similiar