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Awesome,  thanks WAX!  I juuuuuuust finished my C64 tonight and didn't see this until just now... But I might have to open it again at some point and add the LFO...

This one's strictly for Cynthcart use:  audio in,  ground switch,  feedback circuit, 2 "no dead zone" pots,  pot disable switch,  & orange led.

Yeah,  sid#2 is bunk,  but they're sending me a replacement.

So I decided to go ahead with the rest of the mods while I wait for the sid#2's replacement to get here.  I used the "no dead spot" pot mod,  added RCA in's and out's,  added the feedback circuit, added some switches,  and the green led.  Everything is working great!  All I need to do is pop in the new sid when it gets here and hopefully it's done!

This site was a great help:

http://nealbeardahm.blogspot.com/2012/0 … -mods.html

Next I want to modify my other 64,  a breadbin with a 6581,  for use specifically with Cynthcart.

A million thanks to TylerBarnes for your help!

Here she is:::

:)

Anyways... I started by adding the sid2sid circuit and an input and output for sid #2 according to that feedback mod schematic posted earlier.

It seems like it is working,  except sid #2 is very,  very quiet. 

I have been doing research online and it appears this is a common problem with sid2sid installations,  however I could not find a general consensus on what the problem might be.  I plan on doing more research when I get home from work,  but in the meantime I was wondering if anybody knew what this issue might be,  and how to remedy it?

I am using 8580 sids in a C64c,  and I'm using a 2n3904 transistor in the sid2sid circuit.  One sid says MOE,  while the other says CSG (not sure if this makes any difference).  I took the audio out from the sid2sid board and sent it to the feedback pot,  then through a cap to the jack,  with a resistor to ground too. Took audio in pin from sid #2 and did the same stuff,  just like the schematic. 

I did not try switching the chips around yet cause I had to go to work.

Any help offered would be greatly appreciated,  thank you!

I understand.  I looked all over for 8580 sids and eBay seems to be the only place to find them these days,  unless you want to take apart an old 64.  At first when I looked there weren't any on eBay at all,  but now there are a few... I think they are somewhat rare to come by,  even on eBay.  Good luck!

^^^Thanks for being a troll,  for your information I already know how to make an LFO from a 555,  I just don't know where to connect it to the c64.  And I know how to use Google,  too.

What is wrong with asking questions to my fellow modders?!

Sold!