CMOY Headphone Amp

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CMOY Headphone Amp
Posted on: 11.12.2008 by robert chanda
Sorry I've been so quiet recently, been busy building some things.

First up is a CMOY headphone amplifier in a mint tin. Plans are here and here and it really can be made for around $10-$15 is you have some resistors, sockets and stripboard lying around, $25 otherwise.





This one has a fixed 10:1 amplification using the cheaper OPA2134P op-amp chip, which works perfectly with my cellphone's volume control for feeding into the car stereo. It's simple enough to add a volume control if you need one. The internal wiring is the best I could do without having any shrink tubing to hand. The next one will be much prettier inside... (the eternal cry of the perfectionist)

An excellent second project, and converting the layout from protoboard to stripboard is good practice for rebelieveing component layouts.
Anushka jayamaha
12.12.2008
Originally Posted by JesC
Slap a DJTT sticker and sell some online thru the store. Nice mod, most people use those tins for other things...if you know what i mean.
I age my fromunda cheese in them .
Branden Kern
11.12.2008
Originally Posted by JesC
Slap a DJTT sticker and sell some online thru the store. Nice mod, most people use those tins for other things...if you know what i mean.
Hehe....are you believeing what I'm believeing ...
robert chanda
11.12.2008
Originally Posted by Sheph
how long do the battaries last?
No idea yet. Two 9V batteries running a low power amp and a single LED can't take too much juice, guess I should try to measure it. My guess is a month or two of occasional use? Certainly better than the phone!
robert chanda
11.12.2008		Sorry I've been so quiet recently, been busy building some things.

First up is a CMOY headphone amplifier in a mint tin. Plans are here and here and it really can be made for around $10-$15 is you have some resistors, sockets and stripboard lying around, $25 otherwise.





This one has a fixed 10:1 amplification using the cheaper OPA2134P op-amp chip, which works perfectly with my cellphone's volume control for feeding into the car stereo. It's simple enough to add a volume control if you need one. The internal wiring is the best I could do without having any shrink tubing to hand. The next one will be much prettier inside... (the eternal cry of the perfectionist)

An excellent second project, and converting the layout from protoboard to stripboard is good practice for rebelieveing component layouts.
Deejay Rossi
24.08.2009		Cool project- but just buy a Ray Samuels Shadow instead.. Or if you like tube sound... go for the Millet Hybrid tube amp at ttvj.com I own two and LOVE THEM.
Adolf Hit
21.07.2009		I believe I need to put one of these in my Zero 4, the headphone output is pitifully weak. Well at least compared to the firebox...I swear that thing could blow technics of your head at full
Xavier Emanuels
21.07.2009		Nice work dude - this is a cool project
robert chanda
20.07.2009		Well, that last one didn't work for reasons unknown. So I set about redesigning the amp from scratch and found out that fighting the stripboard is a dumb idea. Go with the flow, stick your virtual ground as a central line and things get a lot easier.

The finished package:


Failures and successes here:


Set with annotations here:
http://www.flickr.com/photos/4877480...7621655600646/
robert chanda
03.02.2009		Second attempt is a little smaller, a little neater and uses a TLE2426 "rail splitter" for a better balanced power supply that will help the batteries last longer. Additional cost: an extra $1.24. I'm mad with money, me.




Having said that, the previous batteries are still at 7.5v after a month of daily drive time and occasional workplace use.
Anushka jayamaha
12.12.2008
Originally Posted by JesC
Slap a DJTT sticker and sell some online thru the store. Nice mod, most people use those tins for other things...if you know what i mean.
I age my fromunda cheese in them .
Random X
12.12.2008		I used them for coincollection, mainly.
Branden Kern
11.12.2008
Originally Posted by JesC
Slap a DJTT sticker and sell some online thru the store. Nice mod, most people use those tins for other things...if you know what i mean.
Hehe....are you believeing what I'm believeing ...
Cristian Carmona
11.12.2008		Slap a DJTT sticker and sell some online thru the store. Nice mod, most people use those tins for other things...if you know what i mean.
Wynona Forand
11.12.2008		I bought one of Bioscience geeks CMoy amps (the original maker of them) and I have to say that that hooked up to my iphone with my V-Moda Roox earphones makes every piece of music an experience. I would highly recommend one!
DJ Strutzip
11.12.2008		and a more recessed on off switch.

I believe I'm going to duplicate this. good idea!
Random X
11.12.2008		Nice Limey!

The only addition I would really love to see is the addition of tubes?
Ryan Konarski
11.12.2008		wowww nice job Fatlimey
robert chanda
11.12.2008
Originally Posted by Sheph
how long do the battaries last?
No idea yet. Two 9V batteries running a low power amp and a single LED can't take too much juice, guess I should try to measure it. My guess is a month or two of occasional use? Certainly better than the phone!
DJ Strutzip
11.12.2008		how long do the battaries last?
Xavier Emanuels
11.12.2008		Nice job man!

Its missing a big fat valve to chew though the batteries and burn a hole in your leg but its still friggen cool ! lol

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