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Old 17th December 2008, 02:08 PM   #1
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Default Help me choose an amp please! (learner)

Hi

I've been looking for an electronic amplifier for ages and cant seem to get very far, maybe someone can help me out.

Not bothered if I have to assemble it but would be good if I didn't.
I can solder competently though.

Im looking at low budget, spec should be:

8ohms
20W RMS
50W Max
Stereo (or 2x mono if that will be the same?)
cheap as possible

I will be running x2 monacor SPH-30x 8ohm off them.

Thanks!
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Old 17th December 2008, 04:14 PM   #2
Dan2 is offline Dan2  South Africa
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is there a reason why u want a class d amp?? for that power rating i would go for a chip amp
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Old 17th December 2008, 05:03 PM   #3
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nope, I haven't a clue about amp class's. Whatever suits best.

Also would it be possible to have an amp without a power supply that meet these specs?

Why are all these little circuit amps so expensive!?
I was thinking they were like 10 for 20W RMS 8ohm stereo and didn't think I'd have to buy a separate power supply either.

Is there no cheap amps with a power supply that can be plugged into the wall socket with those specs?
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Old 17th December 2008, 05:33 PM   #4
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Look at the amp modules that Arjen sells, they will work with a 12v walwart. just do a search for his name.
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Old 18th December 2008, 09:29 AM   #5
Dan2 is offline Dan2  South Africa
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i dunno if a wall wart will give u enough current for a 20w x2 amp

Unfortunately you will need a power supply, which is a transformer, bridge rectifier and smoothing capacitors - and it will probably cost more than the amp itself (well the transformer anyway) luckily transformers last forever so maybe u can look around for a used one.

i still think you should go for a chip amp (although i hav never built a chip amp myself the schematics look pretty easy).

just remember not to skimp on the power supply or you will never enjoy the sound of the amp (any amp)
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Old 18th December 2008, 11:58 AM   #6
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Quote:
Originally posted by Dan2
i i still think you should go for a chip amp (although i hav never built a chip amp myself the schematics look pretty easy).
Well, why suggest one over a class D amp then?

A small class D amp of good quality, for example those from www.41hz.com, will match any chip amp at almost any cost in sound quality. That's because chip amps need a very good and expensive power supply before they start sounding reasonable whereas t-amps aren't particulary fuzzy about that.
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Old 18th December 2008, 03:50 PM   #7
Dan2 is offline Dan2  South Africa
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Saturnus thanks for correcting me, i have only seen the class D amp on Rod's site and that looked really complicated, but now checking it again the amp module is bought as a complete set ( http://www.sound.westhost.com/project114.htm ). sorry, i was wrong
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Old 18th December 2008, 04:06 PM   #8
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I think you actually will find a wall wart that can give you 40W. I use an adjustable-voltage 90W SMPS with my Tripath ClassD.

I've never used a 10 GBP Class D amp, but I can confirm that they work exceedingly well at the 35 EUR level. I'd blindly trust the 41Hz Amp32, at EUR 27 each.

Arjen's modules look promising too, but I can't vouch for them as I haven't heard them. The TI Class D chips are a bit cheaper than Tripath aren't they? There have been good reports of the TI TDA class-d chip designs on this forum.
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