audio preamp circuits

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ilaboo 21 years ago

newbee in a way

i need a phono preamp circuit that runs off a battery 9 volts or less

need it for a magnetic cartridge turntable output into equalizer

very simple needs nothing at all fancy--using it to take vinyl onto cd and mp3

i know i can buy one googling for electronic circuit not helpful

must be say only one major component

very litle soldering

input would be rca jacks and ouput jacks the same

i would lke to make on those boards where you just press the component

in

any suggestion or links ( tried a bunch of them and gave up)

would really pe appreciated

tia and happy new year

peter

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Nicholas O. Lindan 21 years ago

"ilaboo" wrote

[Ultra-cheap MM phono pre-amp]

I don't know of any new monolithics, though National used to make op-amps designed for phono pre-amps 25+ years ago.

AOOP (any old op amp) and some R's and C's for RIAA equalization would work fine for MP3 - sound quality isn't an issue - even an LM324 would do. 70's era ap-notes may be a help.

If assembly cost is an issue (like > 1 part) farm the manufacturing out to farm-wives or retirees from an electronics factory.

Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. Remove spaces etc. to reply: n o lindan at net com dot com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/

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Tweetldee 21 years ago

For starters, here are a few sites to look at for ideas. Your choice from extremely simple (OK but not great performance) to fairly elaborate (really fine performance).

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Take a look and see if there's one or two that interest you, then maybe come back with specific questions.

Dave M MasonDG44 at comcast dot net (Just subsitute the appropriate characters in the address) Never take a laxative and a sleeping pill at the same time!!

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James T. White 21 years ago

Peter,

Unless you are interested in learning a good bit of electronics by doing the design yourself, try Googling for a "RIAA stereo phono preamp kit". You should be able to find a reasonably priced one that comes with a printed circuit board, a bag of parts and instructions for assembling it.

James T. White

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JeffM 21 years ago

The *single 9V battery* is a problem. If you can spring for 2 batteries, things get easier.

I question the wisdom of that. You should try to find a hobbyist in your area who has built stuff before (local community college / high school / club).

You're joking. Right?

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The PAIA link is just what you need.

You seem to be saying that you will be making several. James is right on the money with the kit suggestion. Again, PAIA.

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audio preamp circuits

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