Tindie

cMoy Headphone amplifier with standard enclosure

Designed by Akafugu Corporation

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cMoy headphone amplifier kit with fancy aluminum/acrylic enclosure

The cMoy Headphone Amplifier is a headphone amplifier kit suitable for use with portable audio equipment, smartphones, computers etc.

The cMoy is a minimalist headphone amplifier based around a single dual-channel opamp. It is based on a design well-known in the DIY Audio community. We’ve made it into an open source hardware kit that is easy to assemble for anyone looking for a starting point into the world of DIY audio.

We use high-quality parts sourced in Japan, including Rubycon capacitors and a Burr Brown OPA2134PA opamp. The potentiometer is a 10kΩ ALPS potentiometer with built-in on/off switch.

The cMoy comes as a kit, and includes the PCB board and all the components you need.

This version of the kit comes with a brushed aluminum case, with custom acrylic front and back panels. It is made in Japan by Takachi.

The only thing you will need to add yourself is a 9V battery, audio cable (mini jack male-male) and headphones.

2 reviews

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Reviewed By

Thomas

Pretty nice

March 29, 2016 - cMoy Headphone amplifier with standard enclosure

It's a pretty nice kit. Everything seems to be high quality. It has easy to follow instructions and didn't take long to put together. As far as function. I haven't had it long enough to really give it a test.

Reviewed By

Daniel

Enjoyable project.

Jan. 3, 2014 - cMoy Headphone amplifier with standard enclosure

PCB is laid out really easy and except for a few errors the online instructions walk you through the enitre build. Just check all your parts with the schematic. I did get sent the wrong resistors but was told that would help me out if I decided to buy from them again. Cost about 2$ including shipping to get the right ones from digi-key. If I continue using it like I have been I might hack it to plug in via USB or something. The nive volt thing gets old quick. If you've been thinking about a quick project this one is painless.

Response from the Seller

Jan. 4, 2014

Thanks for the review, and sorry again for the component mixup.
If you send us an email with the instruction errors you found, we'll fix the page.

About running from USB:
The amplifier requires a dual supply of at least +-4V to run properly.
When running it on a 9V battery, +-4.5V is obtained by using a simple voltage splitter (using R2 and C1). Splitting the USB 5V PSU would only yield around +-2.5V, which wouldn't be enough, so to power the amp from USB additional circuitry is needed (for instance a DC-DC boost converter etc.)

Running off a 9V power adapter is possible though, but it might pick up 50/60Hz hum, so some extra filter might be needed for best results.