Questions regarding building the CMoy

[tropicalrips 0]

Sure? 

I'll be at Suntec at 5pm....

Haha, can I come along too, then can "qin jiao qin jiao" the shifu

SGH mini meet?

[jasonhanjk 0]

You all really on ahh?

 

kenshiz, I bring the 2 cap while you bring the drawing.

PM you guys my handphone number...

[tropicalrips 0]

ok i'm on

i hav a Rolls HA204 portable amp that can drive 4 cans at once, may come in handy if we want to listen to the same thing at the same time will bring it along

[tropicalrips 0]

5pm? or earlier?

[kenshinz 0]

I've drawn the layout following what Jason has shown me and the original layout shown on Tangent's site. So, Jason can help me check if I've done anything wrong ? Btw I've based the Op-amp on the OPA 2132PA or OPA 2134PA, both which are dual channel. Thanks a million !!

Edited October 24, 2003 by kenshinz

[tropicalrips 0]

jason,

i hav opened up my rolls ha204 amp, the "something else" u saw on it is another OP-amp i think... so it has a total of 5 op-amps, but that hidden one has a different number from the rest, and i think its wired to input side, between the other 4 op-amps & output side, not sure what it actually does.

 

i think u r right about it being similar to the CMoy, but the numbers on the Op-amp is different.

 

Kenshinz, u think your Cmoy can be ready by the next meet? hope to see what it can do

[kenshinz 0]

Will try my best to make sure its done by then... that is if I don't blow myself up making one in the mean time

[tropicalrips 0]

hey i'm also interested in building one for myself

maybe we can help each other out.

i'm in SLS everyday, so i can get the parts more easily, but i don't know what are needed...

maybe u can giv me a list and i can get parts for both of us, i can follow your board layout

Edited October 24, 2003 by tropicalrips

[kenshinz 0]

No problem always good to have another person working together. For the guide and parts list, I got them off Tangent's site, I think its best if you read through it 1st. the link is provided below. I might be going down on Monday to SLT. Will give you a call if I'm there, so we can go shop for the parts together ?

 

http://www.tangentsoft.net/audio/

[jtfoo 0]

Hi Kenshinz,

 

From your drawing, your switch only switches the LED, but doesn't affect the Vsupply to the opamps.

[kenshinz 0]

Opps.... haha ok made a mistake there

Eh.. so how should I wire the switch ?? Thanks for pointing out the error

[jtfoo 0]

Opps.... haha ok made a mistake there

Eh.. so how should I wire the switch ?? Thanks for pointing out the error

Something like this

[jasonhanjk 0]

In this topology, you should buy a double switch that connects the + of the first battery and the - of the second one. The drawings everything looks correct.

 

tropicalrips,

the first opamp is to amplify the audio signal. The second one is to control the volume for each output.

[kenshinz 0]

Ok now got a small problem... actually kinda major... happen to be bugis this afternoon, so decided to go over to SLT to take a look, managed to find all the parts but....I can't find the op-amp. I pratically went to all the shops selling electronic parts in SLT, and they all tell me "Sorry we don't carry op-amp". How now ??

[ckng 0]

Ok now got a small problem... actually kinda major... happen to be bugis this afternoon, so decided to go over to SLT to take a look, managed to find all the parts but....I can't find the op-amp. I pratically went to all the shops selling electronic parts in SLT, and they all tell me "Sorry we don't carry op-amp". How now ??

 

Try ordering the op-amp from RS Components. The Burr-Brown OPA2132 should be readily available.

 

Which op-amp are you trying to buy anyway? I won't really be surprised if you just ask for "do you sell op-amp?" and get a negative response.

 

Regards

CK