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True $20 Cmoy?

post #1 of 31
12/27/10 at 4:49pm
Thread Starter 

Hello,

I'm considering a portable amp for my Beyer DT770 80ohm.  From reading here, it sounds like a cmoy is just the ticket for my first amp.  Using the tangent parts list, the most basic cost is edging dangerously close to $30 from digikey and over 25 from mouser.  I'd like to solder my own amp: how can I get parts for under $20?.

 

I might be able to get my hands on an old pc or something similar to steal parts from--is this worth the effort?  I'm not even on the 'starving student' budget.  Any help? 

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post #2 of 31
12/27/10 at 5:42pm

Where are you? what country

 

cheers

FRED

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post #3 of 31
12/28/10 at 11:15am
Thread Starter 

I'm in Arizona.  I was looking at my costs, and it seems that most of the outlay is going into the switches, sockets, and various accessories.  Does anyone have any suggestions on where I may be able to scavenge these parts?  I'm willing to shell out the 6 bucks for a decent op amp, but don't care about the nobs and such. 

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post #4 of 31
12/28/10 at 11:17am
Quote:
Originally Posted by arw45 View Post

Hello,

I'm considering a portable amp for my Beyer DT770 80ohm.  From reading here, it sounds like a cmoy is just the ticket for my first amp.  Using the tangent parts list, the most basic cost is edging dangerously close to $30 from digikey and over 25 from mouser.  I'd like to solder my own amp: how can I get parts for under $20?.

 

I might be able to get my hands on an old pc or something similar to steal parts from--is this worth the effort?  I'm not even on the 'starving student' budget.  Any help? 


 

a desktop amp might suit the DT770's a bit better, even the 32ohm model is power hungry, though if you really are on a budget,a  cmoy is better than nothing

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post #5 of 31
12/28/10 at 12:36pm
Thread Starter 

I would definitely enjoy a desktop model, but those are out of my budget.  I will probably be using this with an ipod, so mobility is a big +.  I am also considering this project as a good way to get some soldering experience. 

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post #6 of 31
12/28/10 at 1:30pm

How about a Szekeres?
 

Quote:
Originally Posted by buffalowings View Post



Quote:
Originally Posted by arw45 View Post

Hello,

I'm considering a portable amp for my Beyer DT770 80ohm.  From reading here, it sounds like a cmoy is just the ticket for my first amp.  Using the tangent parts list, the most basic cost is edging dangerously close to $30 from digikey and over 25 from mouser.  I'd like to solder my own amp: how can I get parts for under $20?.

 

I might be able to get my hands on an old pc or something similar to steal parts from--is this worth the effort?  I'm not even on the 'starving student' budget.  Any help? 


 

a desktop amp might suit the DT770's a bit better, even the 32ohm model is power hungry, though if you really are on a budget,a  cmoy is better than nothing

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post #7 of 31
12/28/10 at 1:58pm
Thread Starter 

Reading up on the Szekeres : but apparently parts are about $50... I'm trying to stick to a $20 budget.

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post #8 of 31
12/28/10 at 2:54pm

The $20 budget is pretty tight for a Cmoy. mega-congratulations if you can pull it off. 

I have considered running a $75 amplifier challenge at NYC/NJ area meets. "what can you build for $75" and we all compare.

 

On that note, if you are using DIY as a way to save money it really isnt*. DIY audio is mostly a way to find a personal reward in building stuff for yourself, and on occasion you get to hear things that may not be commercially available.

 

*At silly price points (~$400? and up) DIY starts to pay off. Until you consider what you would make flipping burgers instead of building DIY audio gear. Its still not about saving money when you sink a lot into it.

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post #9 of 31
12/28/10 at 3:01pm

Nikongod, that sounds like fun...I would enter that.
 

Quote:
Originally Posted by nikongod View Post

The $20 budget is pretty tight for a Cmoy. mega-congratulations if you can pull it off. 

I have considered running a $75 amplifier challenge at NYC/NJ area meets. "what can you build for $75" and we all compare.

 

On that note, if you are using DIY as a way to save money it really isnt*. DIY audio is mostly a way to find a personal reward in building stuff for yourself, and on occasion you get to hear things that may not be commercially available.

 

*At silly price points (~$400? and up) DIY starts to pay off. Until you consider what you would make flipping burgers instead of building DIY audio gear. Its still not about saving money when you sink a lot into it.

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post #10 of 31
12/28/10 at 6:21pm

Was looking at cmoy kits this weekend and saw this kit on sale for around $15.

http://www.electricsumo.com/shop/new-banzai-v2-cmoy-hi-fi-audiophile-headphone-amplifier-kit/ 

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post #11 of 31
12/28/10 at 6:26pm
Quote:

Originally Posted by nikongod View Post

 

On that note, if you are using DIY as a way to save money it really isnt*. DIY audio is mostly a way to find a personal reward in building stuff for yourself, and on occasion you get to hear things that may not be commercially available.

 

*At silly price points (~$400? and up) DIY starts to pay off. Until you consider what you would make flipping burgers instead of building DIY audio gear. Its still not about saving money when you sink a lot into it.


QFT.  And so it is written...

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post #12 of 31
12/28/10 at 8:04pm

That's totally kewl geek! Thanks for the link.

I picked one up for S&G's for when I'm done with my current DIY project.

Always wanted to build one of these. 

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post #13 of 31
12/29/10 at 5:46am

Me too!  I cannot wait until it gets here.

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post #14 of 31
12/29/10 at 6:37am

The only thing that may be worrisome is the ground between the two 9V batteries.  I am not sure if this circuit can compensate for the batteries being at different voltages (i.e. one battery draining faster than the other).

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post #15 of 31
12/29/10 at 6:46am

 Here is the Schematic

cmoybb.jpg

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