brian@1234
New Member
Can anybody provide me with a circuit for uln2004an chip. I'm trying to use this chip to take a simple 5V input signal from a pic which should output to a 5 volt 42mA relay coil. I orignally though that I could use the shared power supply of the pic to go to the E and com connection, but when testing with an LED, I find that I have to use to seperate power supplies to get the LED to light. It seems that a resistor is also needed at E connection so that the chip doesn't draw to much current. Can anybody give any advice and/or examples for this chip.
thanks,
Brian
thanks,
Brian