Headphone Amplifier Circuits

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

R7-9= 2.2Kohm C2-7= 100uF 25V Q6= BD135 or BD537

R8= 150 ohm C3-5= 100nF 100V MKT
R11-13= 6R8 ohm C4-6= 100uF 16V
R12= 4.7 ohm C8-10= 470uF 25V All resistors is 1/4W 1%

Related Post:

Electronic Circuits

• The Sircuit Scheme Led Blinking
• Creating a Symmetrical Power Supply from a Single Voltage Source
• Headphone Amplifier Circuit With TDA 2004
• Fire Alarm Detector circuit
• Microphone Amplifier Circuit / Preamp Mic
• The Circuit Scheme Electronics Speaker Protector
• Creating Charger from USB Port Computer
• Electronics Scheme Using LED Voltmeter for Car Battery
• Scheme Of The Circuit 60 Watt Power Amplifier
• Free Applications To Make Electronic Schematic Diagram (EZ.Schematics.v4.0.1)