A quick bipolar driver

If you have bipolar transistors in your junk box you can do it like this:

A simple driver using a bipolar darlington pair transistor.

Make sure you put a heatsink on the drive transistor. The diode should be a fast recovery or schottky type. A TIP122 type transistor is good for 5 amps continuous collector current. You can get bigger darlington transistors that are rated at 10 amps or 20 amps. You can also make a darlington pair by connecting two regular transistors together.

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