วงจรแปลงไฟจาก 6 V ไป 12 V

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R1,R4 - 2.2K 1/4W Resistor

R2,R3 - 4.7K 1/4W Resistor

R5 - 1K 1/4W Resistor

R6 - 1.5K 1/4W Resistor

R7 - 33K 1/4W Resistor

R8 - 10K 1/4W Resistor

C1,C2 - 0.1uF Ceramic Disc Capacitor

C3 - 470uF 25V Electrolytic Capcitor

D1 - 1N914 Diode

D2 - 1N4004 Diode

D3 - 12V 400mW Zener Diode

Q1,Q2,Q4 - BC547 NPN Transistor

Q3 - BD679 NPN Transistor

L1 - See Notes

Notes

1. L1 is a custom inductor wound with about 80 turns of 0.5mm magnet wire around a toroidal core with a 40mm outside diameter.

2. Different values of D3 can be used to get different output voltages from about 0.6V to around 30V. Note that at higher voltages the circuit might not perform as well and may not produce as much current. You may also need to use a larger C3 for higher voltages and/or higher currents.

3. You can use a larger value for C3 to provide better filtering.

4. The circuit will require about 2A from the 6V supply to provide the full 800mA at 12V.

แหล่งจ่ายไฟกระแสสูง

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R1 - 680 Ohm 1/4 Watt Resistor

C1 - 20,000 - 50,000uF 20-40 Volt Capacitor

C2,C3 - 100uF 50 Volt Capacitor

C4 - 0.1uF 50 Volt Capacitor

C5 - 0.01uF 50 Volt Capacitor

D1 - Zener Diode (See Notes)

Q1 - 2N3055 Or Other (See Notes)

T1 - Transformer (See Notes)

BR1 - Bridge Rectifier (See Notes)

S1 - SPST 250 VAC 10 A Switch

Notes

1. D1 should be rated at about one volt higher than then desired output of the supply. A half watt diode will do.

2. Q1 can be a transistor similar to the 2N3055. I chose the 2N3055 for it's availability and power handling (150 watts).

3. T1 should be about 5 volts higher than the desired output of the supply, and rated for about one amp more of current. The voltage overhead is required by the regulator section. The extra current is to keep the transformer from over heating.

4. The choice of BR1 will depend on the voltage and current of your transformer. The rectifier should be rated for 50 volts more than the transformer, and 5 amps more than the transformer.

5. The value of R1 will be smaller when supplying high currents. Expiriment until you get what you need.

6. Heatsink and fans are absolutely necessary!