This circuit is useful, as a small headphone amplifier, capable of running several pairs of phones. Fortunately, the headphone amp has an easier job to do, in that both the output power requirements and load characteristics so heavy, because the headphones usually have a load impedance, higher than 50 ohms, (600 ohms typical), and only requires one-2v RMS. max, for normal output. Because only low power output is required, Class A stage, is really worth. For proper operation of output transistor Q5 Class-6, must pass through said each of 100mA. With this supply means ± 15V 1.5Watts dissipation, so the heatsink rather small, will be needed for each. With the RV1 adjusts the audio input signals and Tr1 regulate the output voltage to 0V DC offset (± 30mV). For stereo applications, you need two units, from this amp.
Parts List :
R1-4= 1.2Kohm R14=68Kohm C9-11= 100nF 100V ceramic
R2-3= 3.9Kohm RV1= 10Kohm Log. pot. Q1-3= BC184
R5=100Kohm TR1= 10Kohm Trimmer Q2-4= BC214
R6-10= 10Kohm C1= 4.7uF 63V MKT Q5= BD136 or BD538
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