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-   -   resistors in cmoy (http://www.diyaudio.com/forums/headphone-systems/220025-resistors-cmoy.html)

sharon1 19th September 2012 04:49 PM

resistors in cmoy
 
im planing to build a cmoy amp from this schematics
How to Build the CMoy Pocket Amplifier
for start
now here in Israel is apparently is hard to get 1% resistor

if i take 5% resistor on all of the circuit how awful it will be?
or i make a effort to find a 1% resistor?
i will using the opa2107AP

Fredfred2004 19th September 2012 11:04 PM

5% are fine you just need to match them using a multimeter

sharon1 20th September 2012 07:22 AM

you mean choose the closest?

sofaspud 20th September 2012 07:40 AM

They are all standard values. What you need to do, though, is match the gain resistor values so you maintain channel balance, eg if R3 measures 1012Ω on both channels but R4 is 9600Ω on one channel but 10400Ω on the other, you'll have more gain in one channel.

sharon1 20th September 2012 07:56 AM

hate you E24 series....

Fredfred2004 20th September 2012 08:33 AM

What values are you chasing, why are they so hard to get ?

sharon1 20th September 2012 08:53 AM

Part Lists and Suggestions

not alt.parts
i really don't understand either is make me mad...
minimum order of the 1% is 100 per value is not expensive but i don't have what do to with the rest

Fredfred2004 20th September 2012 08:59 AM

If you want to pm me your address I'll send you some for free,

if that helps, I have loads :-)

cheers

sharon1 22nd September 2012 06:54 PM

connection
 
1 Attachment(s)
the connection are good?
is the first time that i soldering ic's
i will answer only in on Monday

patkwok 28th September 2012 11:00 AM

Quote:

Originally Posted by sharon1 (Post 3171039)
im planing to build a cmoy amp from this schematics
How to Build the CMoy Pocket Amplifier
for start
now here in Israel is apparently is hard to get 1% resistor

if i take 5% resistor on all of the circuit how awful it will be?
or i make a effort to find a 1% resistor?
i will using the opa2107AP

I am also interested to build a CMOY for my Grado MS1i.
However, I can't find information from the website you post. Can anyone give me some more detail?

Many thanks.


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