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You are here: Home / Audio Projects / 60 Watt Stereo Amplifier using Gainclone Concept

60 Watt Stereo Amplifier using Gainclone Concept

Last Updated on January 25, 2020 by Swagatam 2 Comments

The explained gainclone 60 watt stereo amplifier circuit is capable of producing an excellent sound quality, using a single IC LM3875.

The IC is manufactured by Texas Instruments and can be expected to produce a good 60 watts of power output on a 8 Ohm speaker.

General Features of the LM3875

  • The general features of the IC LM3875 can be understood from the following points:
  • Total Harmonic Distortion (THD) less than 0.03% within trhe frequency range of 20Hz to 20kHz and supply range of +/-40V.
  • Internal protection from voltage spikes, short circuit, and output overload conditions.
  • Low Noise output specifically within 95dB

 Circuit Diagrams

60 Watt Stereo Amplifier using Gainclone Concept

From the figure we can see that the input signal is connected to the resistor R2, which sets the input impedance of the amplifier at 33K along with the coupling capacitor C2.

The input stage comprises of an ultrasonic filter circuit stage made up C3, R3 and R1 which suppresses any entry of noise through a low RF attenuation.

After this the signal is allowed to pass to pin#7 of the IC enabling a 25 times gain for the signal. This gain is sustained by feeding it back to the input pinout via R5 and R6 and is calculated by the formula (1 + R5/R6)

A frequency cut of -3dB below 10Hz is achieved via C5 which may be seen attached with R5.

The amplified music input is delivered from pin#3 which is ultimately fed to the loudspeaker for the amplified sound generation, however before this can happen, the signal has to pass through a network of R4 and C4 which prevents the amplifier from getting unstable during full loads and thus ensures a continuous stable output under full volume.

Power Supply

The power supply employs a 24-0-24V 5 Amp transformer which is rectified by the indicated bridge rectifier module, and is filtered using C13 and C14.




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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  2. Sharoj Al Hasan says

    Sir
    I need a 12 V full charge auto cut of circuit
    Can you please help me ??

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    • Swagatam says

      Sharoj, you can search it here

      https://homemade-circuits.com/search/label/Battery%20Charger

      Reply


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