Nice tutorial. Very easy to follow.
Simple BC547 Transistor Tester
Good tutorial. I made it and it works great.
Battery Clip LED Tester.
Great little instructable! I made one and I use it all the time.
I made the circuit on a breadboard first to make sure I had it working correctly. Then I put it together permanently and it works! Your pictures look like they are upside down. You might want to fix them. Thanks for the tutorial.
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