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Old 14th February 2010, 01:37 AM   #1
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Default CMOY shootout!

I fancy building a CMOY for a bit of fun. Looking on eBay I noticed there are lots of different ones available. Its mad, help me choose one!

So whats the best sounding CMOY kit?
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Old 14th February 2010, 02:54 AM   #2
Pars is offline Pars  United States
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I think the best pcb I have seen is the JDS labs bass boost cmoy one. You can buy the pcb by itself:

JDS Labs - Store
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Old 14th February 2010, 02:50 PM   #3
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Looks good

What I'm really asking is which is the best sounding CMOY. Or, what is the best sounding circuit?
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Old 15th February 2010, 02:07 PM   #4
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Every cmoy uses essentially the same circuit - essentially a textbook implementation of a non-inverting opamp. Only trick is to pick a suitable opamp for the job - Notes on Audio Op-Amps is a good place to start, if a bit out of date. I wouldn't buy a kit off ebay based on the chip it contains - it'll likely be rubbish or fake.

OPA2132 gets a bad rap around here, but it really is a very good opamp, and very easy to use. OPA2227 is a slight upgrade. You'd also do well to consider AD8620. All these chips are dual opamps which will run happily from 9V and supply decent output current - perfect for a cmoy.

If you're after something a little bit fancier than the typical cmoy, AMB Lab's Mini3 or Tangent's Pimeta V2 are excellent choices.
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Old 15th February 2010, 02:46 PM   #5
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If you can handle SMD, give the MAX13330/MAX13331 a try.

It does 135mW into 32R @ 0.01% THD+N from a single 5V supply. DC-coupled even, if you dare.
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Old 15th February 2010, 04:48 PM   #6
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Thanks guys I'll check those out.

Any others to consider?
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Old 16th February 2010, 06:12 AM   #7
rabbitz is offline rabbitz  Australia
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Quote:
Originally Posted by Pars View Post
I think the best pcb I have seen is the JDS labs bass boost cmoy one. You can buy the pcb by itself:

JDS Labs - Store
Thanks very much for the link. Been looking for some PCBs.
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Old 16th February 2010, 07:20 PM   #8
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also check out Mini3. good sounding headphone amp, better than cmoy
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Old 16th February 2010, 08:03 PM   #9
nad is offline nad  United Kingdom
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Howdy Mike!

I had the same idea last week so I purchased on of these New Portable Hi-Fi Stereo CMOY Headphone Amp Amplifier* on eBay (end time 17-Feb-10 22:05:34 GMT) Hasn't arrived yet but for only 12ish delivered, it's worth a shot.
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Old 16th February 2010, 09:17 PM   #10
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Hi mate

Ive seen these on eBay. Let me know how it sounds.
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