High-quality two-channel headphone amplifier with power supply.

The amplifier is powered from a transformer with an alternating voltage of ~12 volts.

Amplifier specifications:

Recommended load - minimum 8 ohms, nominal 32 ohms and above;

Frequency response: 12Hz-50kHz (0/-1dB); 12Hz-120kHz (0/-3dB);

Gain: 21 dB;

Signal to noise ratio: 101 dB;

Signal slew rate: more than 35 V/µs;

Supply voltage (AC): ~12 V;

Current consumption: 260 mA;

Quiescent current of each amplifier channel: 125 mA

Set of parts

Transistors:

2N2907 -4 pcs. Analogs (2N3906, 2N4403)

2N2222 -2 pcs. Analogs (KT3117A)

TIP41 -4 pcs. Analogs (KT819A, KT819B)

Surge Protectors:

L7812CV -1 pcs.

L7912CV -1 pcs.

Zener diodes:

BZV55-C2V7 -2 pcs.

Diodes:

N4148 -4 pcs.

1N4007 -4 pcs.

LED: -1 pcs. (AL307BM)

Resistors: 0.25W

2R2 -2 pcs.

5R1 -2 pcs.

22R -2 pcs.

100R-2 pcs.

470R-2 pcs.

1k -4 pcs.

2k2 -3 pcs.

4k7 -8 pcs.

220k-2 pcs.

Trimmer resistors:

10k -2 pcs. (3296W)

Variable resistors:

10k -1 pcs. (R16110G)

Electrolytic capacitors:

100µF -8 pcs. (C3, C5, C8, C10 not less than 16V)

1000-2200µF -4 pcs. (C19-C22 not less than 16V)

2200µF -4 pcs. (C13-C16 not less than 25V)

Ceramic capacitors: (preferably film)

0.22nF -2 pcs. (221)

0.33nF -2 pcs. (331)

0.1µF -14 pcs. (104)

Film capacitors:

1µF -2 pcs. (105), (or 0.470µF, 0.680µF)

Transformer:

Transformer for two secondary windings of ~12 volts and at least 500mA.

Radiators:

6 pcs. (approx. mm 25x25x15)

You can use two large radiators, but you will need to place insulating pads on the transistors and voltage stabilizers.