Thursday, April 07, 2016

260 Watt power audio amplifier

This the circuit diagram of 260 Watt power audio amplifier with power supply circuit capable of delivering up to 260 Watt RMS at 8 Ohms load. The signal level of 1 VPP standard amplitude is input to a differential stage composed of BC556C Transistor. Then the signal is input to the post-formed by complementary transistors in order to achieve the desired power.
 260 Watt power audio amplifier circuit diagram

All transistors except BC556C, should be mounted on a suitable heatsink to prevent overheating. It would also be ideal to mount the plate in a metal cabinet to prevent unwanted noise.

This power amplifier circuit uses complementary transistors in order to achieve the desired power. It is powered by a dual polarity power supply circuit of +/- 45V and consumes 4 amperes. ALL diodes labeled A, B and C in the amplifier circuit diagram are 1N4001 and also be mounted on the heat sink but with silicone grease. The entry should be 1 Volt to deliver full power.

The power supply circuit can not be regulated, but the filter must be very good to avoid “hum” in the speakers.
In this case the transformer has a secondary with midpoint of 32V / 0V / 32V (center tap). For mono amplifier circuit configuration must have a current of 4A, 8A stereo. The diodes must be at least 100V by 6A (mono) to 12A 100V (stereo), you may use bridge amplifier circuit for the rectifier diode. The capacitor should be minimum of 4700μF x 63V each.

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