Favorite Audio Amp Design

RST Engineering · 2011-06-09T22:06:51+00:00

..For the last forty years or so I've been pretty happy with the oldtotem-pole NPN-PNP power output, an NPN for bias between the twobases. and an NPN to ground swinging the bias back and forth. Plusbootstrap to swing it from rail to rail.I only need a couple-three watts into a 4 ohm speaker, have only aunipolar automobile battery supply to work from, could care less aboutquiescent current or distortion or frequency response.Seems to me that somehow with black magic and trickery I can save somereal estate on the board if I can cut the component count down.No, I don't want to use a power op-amp. I've been burned too manytimes with IC audio amplifiers that don't stick around but a couple ofyears. The stuff I made in the 1970s is still repairable when theinevitable clod can't tell red from black wires.Thoughts appreciated. URLs even more so.Thanks,Jim

Jun 09, 2011 41 Replies

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John Larkin 15 years ago

I use Firefox, from various fixed and laptop PCs, and it always works. Other people have said they can't access my FTP files, but I've never figured out why. Some router or ISP thing?

My wife's Ipad, running that version of Safari, won't display FTP files. It sure runs a great Angry Birds.

Maybe I should move them to a web page some day, somehow.

John

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John S 15 years ago

?file:///C:/Users/AppData/Local/Microsoft/Windows/Temporary%20Internet%20Files/Content.IE5/BA3GOP9Q/Amp%5B1%5D.jpg?

Copy the ftp://jjlarkin.lmi.net/Amp.jpg from the message, right-click in the Firefox address field, then click "paste & go".

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