Yesterday I was making up three 3 solenoid circuits to allow remote operation of some confetti drops.
The prototyping went well, except that I burned out the 12v indicator LEDs.
So it looks like I have to add a reverse bias diode across each coil to prevent the back EMF of the magnetic field collapsing from overloading the LEDs the wrong way.
Vid of the end result will follow soon! :)
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