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areed 30th March 2012 07:29 PM

Recommended Simple Chip Amplifier Circuit?
I'm looking for a relatively simple amplifier circuit to build, preferably based on an IC (possibly some kind of gainclone?). I have spent some time searching these forums (and the internet at large) for such a thing, however had little luck in finding anything. I would prefer the amplifier to be mains powered, and I do not want to build one from a kit.

Minion 30th March 2012 10:14 PM

Every chip amp IC has a Datasheet that has the information on opperating the chip which includes a schematic so just look up the Datasheets for the chips (EG:TDA2030 , TDA2040 , TDA2050 , TDA7293 , TDA7294 , LM3886 ect) ....

What do you mean by "Mains Powered" ?? Pretty much any amp that doesn"t run off of batteries is mains powered through a Transformer and DC power supply .......

If you mean powered directly off of the mains then it is both unsafe and not practical if not impossible .......


nigelwright7557 30th March 2012 10:30 PM

There is a vast range on ebay.

areed 30th March 2012 11:10 PM

Are the example circuits on the datasheets generally the best ones to start with then? By mains powered I did mean via a transformer, I mentioned this in the hope that suggested circuits would include more specifically what would be good to use for a power supply.

mikejennens 31st March 2012 12:39 AM

Where are you located and what's your budget? Have you looked at DIY Chip Amplifier Kits, PCB's, Components and Information. and/or
They both sell some very good kits, are affordable, and have a lot of support through their own websites and on this forum.

pacificblue 31st March 2012 06:39 AM

Relatively simple is a flexible description. If you check the Forum, you will find that the more common ICs like LM38xx, TDA72xx, TDA20xx are perceived as easy-to-build by some and as complex and difficult by others.

Really simple are many of the TDAs designed for cars, e.g. the TDA85xx series. They need as little as an input cap per channel, a resistor and a single rail power supply.

For useful recommendations it would help, if you were more specific about the type of amp. Mono, stereo, multi-channel? What speakers do you plan to connect? How loud does it need to be? Does sound quality matter?

AndrewT 31st March 2012 11:27 AM

Decibel Dungeon and Elliot Sound Products are two good sites to get you started.
Both include very simple to medium complicated.
Both include background for beginners.

KatieandDad 31st March 2012 11:37 AM

If you are on low budget I would suggest looking at the PSU first.

See what PSU you can afford and then work up from there.

The three biggest costs in a DIY build are PSU, Heatsink and Case. Most of the gainclones don't need enormous heatsinks and every project is going to need a case of some kind. That leaves the PSU.

areed 31st March 2012 03:43 PM

My budget for this project is limited, as it is my first real attempt at such a device so I would prefer not to have to spend large sums of money in case it does not work out. As such, I am not looking for audiophile-grade sound quality or huge amounts of power. The amp will be connected to a couple of moderately sized bookshelf speakers (not of fantastic quality).

Thanks for the website suggestions, the first one is blocked by Avast but the second one looks promising, particularly this project: Opamp Based Power Amp Where would be a good place to buy a suitable PSU/heatsink (and also other components I guess)? I live in the UK.

AndrewT 31st March 2012 06:57 PM

Ebay for heatsink and transformer bargains. But you will have to be patient.
Be very wary of semiconductors and capacitors, especially from the Far East.

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