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Classic 40W audio amp with discrete components - Page 1
https://www.eevblog.com/forum/projects/classic-40w-audio-amp-with-discrete-components/
This is a 40W audio amplifier built with discrete components. Supplied at 60V (single rail) it will output 40W into an 8 ohm load. Extremely simple and works well. I built and sold many of these in the late 1970s. There were many similar designs in those days.
Hiraga Amplifier - YouSpice
https://www.youspice.com/spiceprojects/spice-simulation-projects/audio-circuits-spice-simulation-projects/power-amplifiers-spice-simulation-projects/discrete-component-power-amplifiers-spice-simulation-projects/hiraga-amplifier/
SPICE simulatoin of a BJT 20 Watt amplifier, with a THD Total Harmonic Distortion of 2,5%. Project Type: Free. Complexity: Intermediate. Components number: 31-50. SPICE software: Micro-cap. Software version: 10.
Discrete Audio Amplifier Kit
https://www.kitsandparts.com/audioamp.php
Maximum output at 8 ohms is about half (0,5) Watt using +12V power. Audio amp can be powered from 3 to 18 volts. Adjust R8 for half the supply voltage measured at R6:R7 and ground Using an 8 ohm speaker load, the circuit has a 50x voltage gain 1 mV (Hi-Z) input produces 50 mV output at 8 ohms.
Amazon.com: 20 watt amplifier
https://www.amazon.com/20-watt-amplifier/s?k=20+watt+amplifier
Simple 20 watt Amplifier - Homemade Circuit Projects
https://www.homemade-circuits.com/simple-20-watt-amplifier-circuit/
Another Simple 20 Watt Amplifier. This 20 watt amplifier circuit is a snap to construct and the majority of of the components is going to be accessible from your 'junk' box. The design is made up of Darlington pre-diriver, Q1 and Q2, a VBE multiplier transistor Q3 and a quasi-complementary output stage comprising of transistors Q4-7.
20 WATT BRIDGED AMPLIFIER KIT | All Electronics Corp.
https://www.allelectronics.com/item/sk-043/20-watt-bridged-amplifier-kit/1.html
The ETron Circuit Labs 20 Watt amplifier kit uses built in circuit and temperature protection to create an audio amplifier that delivers up to 20 Watts of power into a standard 4 Ohm or 8 Ohm speaker. The two TDA2003 integrated circuits are a versatile choice, allowing a wide range of applications, without fear of overloading the circuit, sending audio through either a 4 Ohm or 8 …
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