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Cmoy Panel components? (help a kid)

post #1 of 3
6/21/11 at 3:32pm
Thread Starter 

Hello guys, I read this forum a lot but never joined it, until now redface.gif . The reason why I made this thread was to ask my fellow friends, who knw more than I do about some problems which I am having building Cmoy. Follwing are the 3 problems which I am having.

 

 

 

 

1. How to find the left and right channel of the I/O jack and also the ground? 

 

     Tangentsoft says "The basic procedure is to hook some kind of patch cable up to the jack and then use your ohmmeter to find out what part of the cable   goes to which pin or lug on the jack." I seriously dont know how to proceed forward with the stated procedure. Please shed some light.Here is the picture of my I/O jacks I will also provide the link of the its datasheet 

iojack.PNGi11.PNGi22.PNG

 

Datasheet - http://products.cui.com/CUI_SJ1-3513_Datasheet.pdf?fileID=5769    

 

 

 

 

 

2. The potentiometer (volume control)

 

I cannot understand which pin (of the volume control) to solder to which part of the I/O jacks. For example in the picture annotated-evj.jpg it says intput 1 and input 2. What i dnt undersatnd is which pin ( i1 or i2 etc ) should be soldered to the left or right channel of the I/O jacks? vcontrol.PNG

 

 

 

 

 

3. Switch

 

I am not able to understand the role of the middle pin in the switch. Do I have to solder the middle pin to anything? or just leave it alone?

switch.PNG

 

 

Thanks

 

 

PS: For the section of Assembling Panel components, Tangensofts tells us to read the following link http://tangentsoft.net/audio/pancomp.html .

I read all of it but I am just 15 years old. So for me, it is really hard to understand the technical terms. I spent the last 2 days trying to find answers for my asked Questions until I made this thread to ask help from my seniors who know a lot more than menormal_smile%20.gif. Again, I would really appreciate your help guys as I have been stressed out and demotivated as I cannot proceed forward with my Cmoy amp frown.gif. 

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post #2 of 3
6/21/11 at 4:01pm

http://tangentsoft.net/audio/cmoy-tutorial/assy.html

 

Please refer to the picture about 2/3 of the way down to the bottom. You'll see a hand holding a male 1/8" audio jack with three alligator clips on it. This is exactly what you need to do. There is a description to go with it but I will briefly tell you what to do. Attach three test leads to one end of a male-to-male 1/8" cable, and plug the other end into the jack itself. Set your multimeter to read resistivity (ohms). Attach one of the multimeter's leads to one of the alligator clips, then touch the other lead to each various pins sticking out of the jack, one at a time. Lo and behold, one of them will have zero resistance and the others will have infinite because they are not attached. You use this to determine which pins correspond to the tip, ring, and ground. Heck, my 1/8" jacks that I ordered had five pins and two were dummies...this is why what Tangent is telling you to do is good practice, since there is no standard pinout, generally.

 

The pot is labeled input 1, input 2, output 1, and output 2 because that is exactly what it is. A stereo potentiometer has no left or right, it is simply two individual potentiometers attached to each other and connected to the same shaft. Therefore, you can make input 1 and output 1 left or right if you would like, and likewise, input 2 and output 2 can be left or right. The two ground pins get soldered to the ground, so you can solder one wire to both of them at the same time and then solder that to the ground...that's what I did, it's easier.

 

For the power switch, use your resistivity meter again. Find out which two pins will make the multimeter switch between zero and infinite resistivity and use those. Ignore the other one.

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post #3 of 3
6/21/11 at 4:02pm

Welcome to the forum.

 


Doesn't matter left or right for input/output 1 or 2 on the pot. Just follow through the whole way to the output with left or right. You'll know they are reversed when you listen to your favorite song and it sounds out of whack or not quite right.

 

Do you have a multimeter?

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