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General Mach Discussion / Re: Need relay setup help
« on: September 06, 2008, 01:12:04 PM »The easiest way is to drive the relays via a Darlington array, direct from your LPT1 port (or from your breakout board). A Darlington array is a power amplifier, and all the circuitry is contained in a 16 or 18 pin chip, which contains 7 or 8 seperate circuits. The cost less that £1 in UK from Maplin.
The circuits can each sink 1/2 amp and can be wired in parrallel to increase that. They take in a GND wire from your computer and a positive supply to drive your relays (whatever voltage you need). They are simple and easy to use, and do not need any additional diodes, etc.
What is the P/N of the chips you used I was looking at ULN2064 series quad drivers and wondering if they would work.
Kristin