60W Amplifier

Posted on Feb 7, 2014

This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively high power outputs, and a certain built-in degree of loudspeaker protection, due to capacitor

60W Amplifier
Click here to download the full size of the above Circuit.

C8, preventing the voltage supply to be conveyed into loudspeakers in case of output transistors` failure. The preamp is powered by the same 60V rails as the power amplifier, allowing to implement a two-transistors gain-block capable of delivering about 20V RMS output. This provides a very high input overload capability. The Darlington transistor types listed could be too oversized for such a design. You can substitute them with MJ11014 (Q3) and MJ11013 (Q4) or TIP142 (Q3) and TIP147 (Q4). In all cases where Darlington transistors are used as the output devices it is essential that the sensing transistor (Q2) should be in as close thermal contact with the output transistors as possible. Therefore a TO126-case transistor type was chosen for easy bolting on the heatsink, very close to the output pair. R9 must be trimmed in order to measure about half the voltage supply from the positive lead of C7 and ground. A better setting can be done using an oscilloscope, in order to obtain a symmetrical clipping of the output waveform at maximum output power.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Sequential Flasher Circuit
    6.5Mhz Vfo Circuit
    200mA per Hour 12V NiCAD Battery Charger circuit
    multiplexer with limiter and low pass
    solar battery charger circuit schematic
    car burglar alarm timer
    Design Of Op Amp Sine Wave Oscillators
    Triton Cooling Systems
    Arduino Differential Controller
    Altec 1566 vacuum tube mic preamp and direct box
    Connecting the PICAXE-08 Microcontrller to other Components
    Ultrasonic drilling machine circuit
    DK04 monitoring module with the computer communications interface circuits
    Square transform circuit diagram
    Motor Speed and Speed protection circuit of small hydropower stations