JLH Class A Headphone Amplifier
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.
JLH Class A Headphone Amplifier
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