Generic prebuilt cMoy amp

General Information

A CMoy is a pocket headphone amplifier originally designed by Chu Moy on the Headphone Resource Site and public discussion Forums.

The headphone amplifier is designed around single or dual-channel op-amps such as Burr-Brown's OPA2134 or OPA2132PA, however, a wide variety of op-amps have been successfully implemented. The amplifier's design is quite simple. It consists of only a few components, can be assembled on a small section of protoboard, has a lower parts cost than other headphone amplifiers, and can run for many hours on a single 9 volt battery. In spite of this, a well-made CMoy amplifier can drive even demanding headphones, like Sennheiser's HD600 or low impedance Grados quite well. These characteristics have made it very popular among DIY hobbyists, especially those who have not built an amplifier before. The CMoy headphone amplifier can be fit into Altoids tins and can often be found for sale on eBay by searching for "CMoy".[1]
(Photo from Wikipedia)

Latest reviews

Pros: Volume Boost, Some Extra Bass
Cons: Could be fragile
Stepped up to a CMOY OPAMP 2227 from my FiiO E5. Definitely a nicer volume boost, also adds some bass to my already booming HFi-580s. Fun little amp to have on the go for a good price. Haven't compared it against really high end stuff though, so can't say if it's a great audio quality booster. But for 25 - 45 bucks, they're a nice way to power cans that need it, or give a little kick to ones that don't.
Pros: not sure
Cons: not sure
i bought one of these CMOYS off ebay and really can't say i notice anything. maybe if i had headphones that really needed an amp? but my phones have low impedance, so if the CMOY is doing anything, i can't tell.


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