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-   -   Virtual breadboard of a mono CMOY. Have a few questions (http://www.diyaudio.com/forums/chip-amps/209922-virtual-breadboard-mono-cmoy-have-few-questions.html)

alfa147x 1st April 2012 05:05 AM

Virtual breadboard of a mono CMOY. Have a few questions
 
http://i.imgur.com/E6iKP.png
http://i.imgur.com/NJa2T.png
Based off of this PDF

How does the breadboard look?
I can't figure out where all the "ground" symbols are actually connected to. Any ideas?

AndrewT 1st April 2012 10:56 AM

Create an Audio Ground for the amplifier.
Create a Signal Ground for the input.
The junction between the batteries is your Zero Volts.
Join all these grounds together at the Audio Ground.

epicyclic 1st April 2012 12:29 PM

Hi



Theres no connection from the centre of the batteries to centre of C4 and
C5

Edited some comments as believe i was misreading the small print on the PDF

pacificblue 1st April 2012 02:17 PM

Compare your schematic to the original. Think about S2 in your schematic again and what happens, when you flip it. Correct your schematic accordingly. Then start the breadboard layout again.

All the ground symbols are connected to each other. It can make sense to connect them groupwise and then join the groups, as Andrew suggested, but that's probably breaking a fly on the wheel in this context.

Don't create a ground between the batteries. Batteries may discharge at different rates or may come at different charge levels already and your ground would not be reliably at half supply. It is better to stick to the original schematic, create a single supply and a virtual ground.

alfa147x 1st April 2012 05:37 PM

So once I create the virtual ground I can then connect anything that calls for a ground to it? Does this also work for the return from the headphone/speaker?

Thanks for the help. I don't know why I forgot to create the virtual ground on the power side. I'm using fritzing and while it was easy it was a bit of learning curve.

Thanks again!

alfa147x 1st April 2012 06:29 PM

http://i.imgur.com/hoUkc.png
I've added the virtual ground that I forgot.

Also what does S2 stand for?

AlexQS 1st April 2012 07:53 PM

Quote:

Originally Posted by alfa147x (Post 2968903)

Also what does S2 stand for?

It's hard for me to read "S2" on your diagram. Are you talking about the top left corner of your diagram. That looks like an on/off power switch in line with the batteries,.... I can't see for sure if that says "S2" "B2" or "82" but it's a switch in the top left.

alfa147x 1st April 2012 08:05 PM

Here is a link to the full size image for the diagram:
http://i.imgur.com/zDlAR.png
Quote:

Originally Posted by AlexQS (Post 2968997)
It's hard for me to read "S2" on your diagram. Are you talking about the top left corner of your diagram. That looks like an on/off power switch in line with the batteries,.... I can't see for sure if that says "S2" "B2" or "82" but it's a switch in the top left.

Oh. I was talking about this:

Quote:

Originally Posted by pacificblue (Post 2968563)
Compare your schematic to the original. Think about S2 in your schematic again and what happens, when you flip it.


AlexQS 1st April 2012 08:21 PM

Quote:

Originally Posted by alfa147x (Post 2969010)
Here is a link to the full size image for the diagram:
http://i.imgur.com/zDlAR.png


Oh. I was talking about this:

Ahh,.. I see. I do pay attention to Pacificblue, has more experience than I do. :)

alfa147x 1st April 2012 09:30 PM

Quote:

Originally Posted by AlexQS (Post 2969031)
Ahh,.. I see. I do pay attention to Pacificblue, has more experience than I do. :)

I'm paying attention to everyone. Everyone has more experience than I do ;) lol

Here is my attempt at dual mono op amp setup:
http://i.imgur.com/KYYXN.png
Link to larger version

I based it off of the OPA637/627 I'm not 100% those are the chips I want to use.

How does that diagram look? I've placed an X on the extra capacitor I've placed.

I've read the datasheet on the OPA637 multiple times but I can't seem to figure out how to decipher it's ideal power requirements are . I was able to figure out the max is 36 and the min is 9.

My next step is to figure out how to supply about 18 volts @ 13 mA to each chip. I'm assuming that would be the ideal amount per chip.

Thanks for the help!


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