ETI-480/AEL-480 50W Power Amplifier Module
In March, 1977, ETI published a very popular project called the "ETI-480", with two versions offered; a 50W and a 100W. Countless thousands of these amplifiers were built over the years. I've revamped it with a brand-new PCB layout and modern components, including the use of flat-pack transistors (as opposed to the now obsolete (and mostly faked) Motorola TO-3 transistors).
Build two of these for stereo (I would suggest a power transformer rating of at least 300VA). This will happily deliver a clean 60W into 8 ohms with little, to no problem.
NOTE 1: There is no short-circuit protection on the output, so if the output is shorted to ground, either F1 or F2 will blow.
NOTE 2: If you plan to connect a preamplifier to this/these using the same power supply and ground point, R3 the 10 ohm 0.5W resistor is to provide ground-lifting for externally connected equipment only. Connect the ground of the preamp to the GND point (or star-earth point in the chassis), not J1's "COM" connection.
Specifications:
Power output: 61W RMS (124W peak) @ 8 ohms / 105W RMS (211W peak) @ 4 ohms
Frequency Response: 20Hz-20kHz
Input sensitivity: 3.24Vp-p (1.15V RMS) for full output
Output DC-offset: <= 20mV.
Suggested uses for this: guitar amplifiers, home audio power amplifiers
Link to the video about this project, including detailed construction tips, especially how to attach it to a heatsink:
ETI-480/AEL-480 50W Power Amplifier Module
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