Published on March 18, 2017
Materials : 100ohm 1W Resistor, NPN power transistor(C5198), Heat sink, Electric wire, Fly back transformer.
Step 1. Make a center tap to thin electric wire.
Step 2. Winding electric wire to Flyback transformer. (A end) – [ 8 turns ] – (Center Tap) – [ 8 turns ] – (B end)
Step 3. 100 ohm resistor’s one leg connect to (A end) terminal.
Step 4. 100 ohm resistor’s other leg connect to Transistor’s Base.
Step 5. Transistor’s Collector terminal connect to (B end) terminal.
Step 6. (Center Tap) is connect to +5V, Transistor Emitter is connect to GND.
This circuit input current is 3A @5V, 2A @3.3V.
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