#10 Журнал " РАДИО" № 2, 1987 г. , стр. 59 ЗА РУБЕЖОМ - This is an abstract (E. Margan. Add-on current dumping. - Electronics & Wireles World. 1985, Vol. 91, October. No. 1596. p. 40).
VT3 / VT4 included with a common base. Form NFB by current through R6 / 12 from resistors .
VT3 / VT4 included with a common base. Form NFB by current through R6 / 12 from resistors .
Further in No. 12 / 1990 radio magazine page 63. G. Bragin's amplifier, adaptation of the idea to the Soviet element base. Then V. Mogilny with its variants of Super A . Familiar for a long time.
I finally found out that an excellent (and seemingly complete 🙂 ) online archive of Electronics World (+wireless world) is available. Very cool. I don't know how long I missed to notice... Anyway, grateful to know now 😎
Back at #12, Paul Bysouth gave one if his references to an article by Marcel van de Gevel, titled `Audio Power with a New Loop’ in Electronics World, Feb. 1986". Though the magazine title was then "Electronics and Wireless World", the Feb. 1986 issue/date reference still seems to be wrong. Does anyone have a correct reference to the article or is it just me who can't follow the clues?
It should be 1996.
Marcel van de Gevel, “Audio power with a new loop”, Electronics World incorporating Wireless World, February 1996, pages 140...143
Marcel van de Gevel, “Audio power with a new loop”, Electronics World incorporating Wireless World, February 1996, pages 140...143
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A nice illustration how to correctly use a suddenly-starting sinewave input signal: run it through a low pass filter to make it suitable for audio work.
Anyway a nice instructive article, as are all articles by Erik Margan.
Jan
>Marcel van de Gevel, “Audio power with a new loop”, Electronics World incorporating Wireless World, February 1996, pages 140...143
https://worldradiohistory.com/UK/Wireless-World/90s/Electronics-World-1996-02-S-OCR.pdf
https://worldradiohistory.com/UK/Wireless-World/90s/Electronics-World-1996-02-S-OCR.pdf
In such a circuit, it is sufficient to connect a resistor between the bases of the output Darlingtons to provide a small through current.
Not popular OK, but quite effective.
Hi Stanislav 1957,
here bambo (1964), I noticed your dislike (also in posts 20 and 22, unless I'm mistaken of course) of Erik Margan's approach before. I keep wondering (just like with others who seem to dislike) why you don't like the non switching B solution proposed by him. I think it is very well explained, elegantly simple and above all effective... Is it -to your ears- soundwise not OK? Is there a Balkan war or another post iron curtain smudge? Do you have measurements that are radically different from the ones of the author?
It is a question for me. I simply don't get why Margan's solution is no good in your opinion.
Apart form this, I want to wish you and all fellow-DIY audio enthousiast all the best for 2021!
best regards,
Mark
Hi Stanislav 1957,
here bambo (1964), I noticed your dislike (also in posts 20 and 22, unless I'm mistaken of course) of Erik Margan's approach before. I keep wondering (just like with others who seem to dislike) why you don't like the non switching B solution proposed by him. I think it is very well explained, elegantly simple and above all effective... Is it -to your ears- soundwise not OK? Is there a Balkan war or another post iron curtain smudge? Do you have measurements that are radically different from the ones of the author?
It is a question for me. I simply don't get why Margan's solution is no good in your opinion.
Apart form this, I want to wish you and all fellow-DIY audio enthousiast all the best for 2021!
best regards,
Mark
Mark, if I may intrude - Margan's idea seems to be good - but can we see even one amp utilizing his idea - built and tested?
Or at at least working sim of a practical amp, with decent numbers showing?
I would love to see something at least sim-able or, even better - built.
Happy New Year!
Or at at least working sim of a practical amp, with decent numbers showing?
I would love to see something at least sim-able or, even better - built.
Happy New Year!
I try to avoid giving ratings to the works of other authors. I didn't say that I didn't like this or that amplifier. I said that this solution is not very popular among the masses and that's all.
Happy New Year 2021 to all, happiness, health and a peaceful sky above your head .
Happy New Year 2021 to all, happiness, health and a peaceful sky above your head .
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I built two class B amplifiers this year. Both have virtues, showing outstanding results in some areas, but I don’t think that class B would be the last word in the world of audiophile amplifiers. They simply didn’t make a breakthrough in sound reproduction. Thanks to everyone (especially for you gentlemen) for help and inspiration throughout the year. I wish you all a happy new year and good health. New year will begin with new amplifier (principle).
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Of course Minek,
you can intrude. What, I ask myself, is wrong with the amp Erik Margan, including measurements, himself presented (many, many moons ago)? I built some quite comparable amps myself, but have no sim, nor real life measurements figures to show. I use them for LF operation only... my thinking (I admit: belief) is that at LF (below say 3 kHz) Margan's non-switching Class B is more than good enough (as in state of the art). And perhaps (I believe) at HF pure class A (if at all possible without loop feedback 😎) may have a subtle but worthwhile advantage 😉
kind greetings,
Mark Bolech