any help on this circuit

Hi again,

I am progressing with my pinball thanks to the help on this forum.. I am at the lighting stage now and have a question. Attached is the light board picture. It uses 9v. How does this circuit work.

any ideas on driving this from ardunio??

Base Unit Light Circuit.png

Do you have a schematic?

Magic.

Ok, relying on 100% guess work from limited information... it appears that the lights are controlled by transistor switches. This would be the standard NPN transistor, emitter to ground, collector to the lamp... the other side of the lamp to 9V positive source and resistors at the base... one *inline" for base current control and one from the base to GND for pulldown.

So, if my guess is true... logic from PINS to the correct wires should be fine as the transistors will provide isolation from 9Volts... but ONLY if my guess from only seeing the FRONT of the board... is correct.

Hi,
Looks like what pwillard says, but 7 lamps and 11 transistors, it must be a bit more to it.
Can we have a clearer picture, especially where each of the ribbons connects to the board so we can see the screen print please.

Tom..... :slight_smile: