Converter circuit for automotive 12V to plus or minus 20V (audio amplifier power supply circuit)

Converter circuit for automotive 12V to plus or minus 20V (audio amplifier power supply circuit)

Parts List
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Resistors
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2 R1, R2 = 10
4 R3, R4, R6, R7 = 1k
1 R5 = 22k
1 R8 = 4.7k
1 R9 = 100k

Capacitors
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2 C1, C2 = 10000uF
2 C3, C6 = 47u
1 C4 = 10u
3 C5, C7, C14 = 100n
2 C8, C9 = 4700u
1 C12 = 1n
1 C13 = 2.2u

Integrated Circuits
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1 U1 = TL494
1 U2 = TPS2811P

Transistors
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2 Q1, Q2 = FDB045AN

Diodes
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4 D1-D4 = 1N5822
1 D5 = 1N4148

Miscellaneous
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1 FU1 = 10A
1 L1 = 10u
1 L2 = FERRITE BEAD
1 RV1 = 2.2k
1 RV2 = 24k
1 T1 = TRAN-3P3S

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