Building a CMoy for my Koss.

[Schalldampfer]

Hello, I'm a total newbie requesting help from you experts on buildling a CMoy. I've been referred here by some members on another forum. Currently, I have this:
http://www.bswusa.com/proditem.asp?item=PRO3AA
And a Creative Zen Micro.
The stock earphones are of decent quality, but I want something more, and thus my Koss comes into play. I've most of the things planned out in my head and now need to get the materials, but I can't seem to find an op amp in a store nearby. I have access to Fry's and RadioShack. My thanks in advance for your help.

 

[rellik]

look here for a great cmoy resource: http://tangentsoft.net/audio/cmoy-tutorial/

on the site are many diy beninner stuff, like supplies, what you should have as a diyer, and more stuff

 

[Schalldampfer]

Thanks, rellik, but that's where I started from. I need to know where I might be able to purchase an op amp, as I seem to have all the other materials covered.

 

[Schalldampfer]

Uh... where can I get a decent op amp, do you think? And it has to be an offline shop.

 

[skyskraper]

where exactly are you located?

 

[Schalldampfer]

I'm in Houston.

 

[skyskraper]

http://www.ralphselectronics.com/
http://www.epo-houston.com/
http://www.ace4parts.com/

these are just the first three hits on google, im sure there are many more out there, check the yellow pages.

 

[Schalldampfer]

Thanks, sky. I now have another qusetion: will using carbon resistors instead of metal film ones dramatically impact the performance? And I think I will have to shop online for some of these...

 

[skyskraper]

why dont u try go to these places first and see what they have? im sure they'll have metal film resistors.

in another thread pars (i think it was) mentioned fry's have metal film resistors.

 

[Schalldampfer]

Well, I checked all of them and none of them had the Op Amp. So I guess I'll have to order everything from DigiKey or Newark. Might as well return everything I bought and order now. Thanks for the help, though, sky.

 

[Pars]

RadioShack has a 50-pc metal film resistor assortment for ~$5 that has every value you need for a CMoy... in fact if they match well you can possibly get 2 CMoys out of it. They also carry a TL082 opamp, that, while not great, will work. The pot your out of luck anywhere except Digikey (or get one of the Alps RK097s with built in switch from Tangent).

resistor assortment:

op amp:

 

[skyskraper]

did u call them or just look on their websites? i find a phone call to be more powerful then 5 mins with a browser, especially for electronics stores

 

[Schalldampfer]

Thanks, Pars. I'll look into them. But if I were to use all parts from RadioShack, what should I do about the metal film resistors? The only ones they had were carbon resistors. And yes, Skyskraper, I did call them and had the guys check the inventory. If I am to order online, is DigiKey a credible website?

 

[ben.phelps]

while browsing at radio shack here in colorad osprings, i foound a dip-8 texas instruments op-amp. i dont know any of the specs, and it probably isnt anything that great, but it might work for you.

 

[cetoole]

Digikey is a very reputable website, I have used them several times, as has probably 99% of the people in the DIY section of the forums who live in the USA. One thing to watch out for, for small orders (under $25) there is a $5 handling charge slapped on, so you might wanna check out mouser, another great site that I am about to place a rather large order with.