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Old 09-01-2010, 09:18 PM
xee2 xee2 is offline
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Join Date: Jan 2010
Posts: 580
dual transistor circuit

Another test using transistor protection. Dual transistors with heat sinks do not get hot after 5 minutes at 12 volts. This seems to be a transistor safe circuit at 120 mA. Now I need to see if I can push the current up higher.

Whoops ---- I had my LED backwards. I have replaced circuit diagram to show corrected circuit. 1N4007 diodes were removed since they were not doing anything. Sorry about the mistake. This is just about what Slayer has already posted.

circuit =

heat sink photo =

coil photo at 12 volts =

Last edited by xee2; 09-02-2010 at 04:30 AM.
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