Asked — Edited
we can use this right....with a digital port.....on and off correct?
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this transistor like the infamous hall monitor.....i dont know how to use them,
Go to the URL that Choyster lists. That will tell you how to use the transistor. Also DJ had a really slick jpg of the TIP 120 showing a wireing diagram but I tried going back to get it for you but it had been moved. May be DJ will put it up agian.