Jim's Robot - Inverting Relay Controller Board
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The board uses a standard NPN transistor (2n2222, 2n4001) to drive a IFR510 mosfet. This allows the 12v to be fully isolated from the logic side.
This board was developed as an inverting circuit only because I had the parts to make it that way. It's genesis came when I was using a simple single NPN transistor to pull up the relay. The current draw from the logic was so high that the I2c bus would reset itself every time that I threw a relay.