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Power Supply Circuit: Circuit power supply regulator 0-35V 2A by IC
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boss audio amplifier - Schematic Power Amplifier and Layout - How to
BD140
Transistor Basics | BD139 & BD140 Power Transistor Tutorial : 7 Steps
BD140 pnp transistor complementary npn, replacement, pinout, pin
Some of my Circuit Collections redrawn using TinyCad
Power Supply Circuit: Circuit power supply regulator 0-35V 2A by IC
Battery Charger Circuit Diagram with Piezo Ttransducer