You need to connect to the extension port, that supplies 5 volt.
With these 5 volts you have to switch a relay that switch 12 volt to the shaker motor.
And it's recommended to use a rev regulation for the motor, too.
Don't connect the PinSound-Board directly to the 12 Volt motor!
In the PinSound-Studio Version 09 you can adjust the timing for the shaker motor in milliseconds for each sound you want the shaker turned on if played.
So, if you want the motor shaking at a special sound you have to enter the time how long the 5 volts from the PinSound-Board need to switch the relay. Each time the sound is activated, the relay will switch the shaker motor on and off.
For all these modification you MUST have a separate power supply with 12 volt and 10 ampere to reduce the power consumption of Indys power supply because high electric current will occur in odd resets of the pinball machine.
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The small board on the right is the 5 volt relay (two circuit) with the connector from the PinSound-Board on it.
Left you see the adjustable rev limiter.
In front of the shaker box I have mounted the separate power supply for stable 12 volt for the shaker motor and the PinSound-Board.
The shaker motor is switchable, maybe more practical for service or repair.