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Developing a classic transistor audio amplifier of 50/60 Watt on 80-90 Volt first ideas, part 1



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Please read the description/textbox. A first setup to make an audio amplifier for 50 Watt or 60 Watt audio output that can work on (say) 80 to 90 Volts DC.

Of course we know that the “Wattage” of an audio amplifier is very relative when we talk about the Decibel/effective AC/ and how sound (sound levels) impact(s) the human ear and the sensitivity of the human ear for (certain) frequencies. Say the well known ear-sensitivity curves for certain frequencies between 20 Hertz and 20 KC, related to the power of the audio signal. Or the Robinson-Dadson curves (google them).

There are more video’s on my YT Channel about these “issues”. Thus: many considerations, anyway.

I hope to make a good functioning say 60-70 Watt audio amplifier with a handful of (cheap, 80 cents each) bipolar transistors, that is my aim. Of course the real costs are in the power supply. Properly well smoothed DC like without ripple or noise at the maximum audio output (!).

This is a first video that gives some ideas about the direction to where I am going to.

In my book “Schematics 2, Audio Amplifiers and loudspeaker boxes” (available on the LULU website) I have published my ideas about audio + many schematics of quite simple and well tested audio amplifiers.

Not sure that this project will succeed, say a 80 % success factor. If not the video will be deleted.

Parasitic oscillations are the most "threatening" issue, because everything is made on a piece of wood with some “hay” wiring. Though there are many (easy) ways to suppress them (more in an earlier video). More info about how to find and cure them is here https://youtu.be/dVLAwjEHgxo

In all cases: the power supply to a (any) audio amplifier is key to success: it must be a proper DC voltage free of hum, ripple, noise etc. Much about that on my YT Channel.

I will use the earlier published 110 V DC power supply. Video about it (with links in the description/textbox about how it was made/developed) is here https://youtu.be/83KpHTrXIx8

When you have questions about (certain analog) electronic circuits and how to make them: go to my Channel trailer (Radiofun232 on You Tube) and go to the “looking glass”. Type there the keywords that you want/need like: “power supply”, audio amplifier, capacitor tester, oscillator, radio, shortwave, shortwave radio, or any keyword you like to find the essential info & schematics on my YT channel.

You can contact me via email when you have questions about my published circuits. I always ask for a picture of what you have made + a problem description; I ask to communicate.

My You Tube channel trailer is here: https://youtu.be/xbgQ8T3oqh4 When you search, search always “NEWEST FIRST” to get the right overview. You can also search via the “looking glass” on my Channel trailer via keywords like ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in. My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there.
https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=Ko+Tilman

I keep all my YT videos constant actual, so the original video’s with the most recent information are always on YouTube. Search there, and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc.

Some persons try to find gold via my circuits. I take distance from all these fake claims. I cannot prevent that this happens. Upload 10 March 2022.
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Audio
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