PowerSmart Solar Speeder Motor by 2N3904| Circuit Project

This must be the most efficient bipolar transistor motor driver design for this application and I recommend it for the solar roller competitions. A 1381E is used to trigger at 2.4V. While it takes a total of 10 components plus motor compared to the stock circuit’s 6 components, you will clearly get better performance compared to a stock Solar Roller/Speeder circuit.

Circuit diagrams and schematics - Electronic projects

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PowerSmart Solar Speeder Motor by 2N3904