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Hi Tom, I just posted a redrawn diagram to get a better overview of the effects order. Since, for some reason, the resolution is reduced after the file transfer, I put a copy here too

I can't help thinking that foot pedal control of the "brilliance" setting would be much more useful...!

Another Question about the exp wha circuit: none of you have audio or video where you can hear this effect? On my cs 80, with the pedal at full volume (full down) , you will hear the sound of the

yes. it's just and old wah-wah guitar pedal circuit.

Thanks David, What about PH3..?... would that be the actual "wah" photocell...? Cheers, Tom

Hi Tom! Quick note since I’m at work. I’m looking at the big, fold-out schematic at the PRA EXP WAH Circuit all the way at the top right. The foot pedal voltage comes in on EI(52) and buffered

Hi folks, Not been here for a long time... but I thought I'd make a quick post. I've been playing the 80's a lot recently... and have gotten into altering the Brilliance fader during play. It's

Hi, I now have all IGxxxx voice chips back in stock including the VCOs and VCFs. Doug synthparts.com

I'm sorry I can't provide any further details about where the grounds join together or join back to the grounds from the PSU; I just don't remember. One detail I can provide is that it was power

I’m keen to know where the grounds should be linked. I’m seeing the M card ground is 0.3 ohm with respect to the logic power ground, but around 2k to the +/-15V ground. I’m guessing that

Hi Lucid Sound, I remember that in the case i mentioned, some of the voltages I measured would change unexpectedly when I played up and down the keyboard, thus giving me the clue that the analog and

I'd check if all the intended ground connections are intact. I've seen units where the +6.5/-8.5 (whatever it is LOL) volts, (or the other rail) become "decoupled" from each other when they lose

Today I had a CS80 in for a service. Basically most of the voices were working, but a couple were dead and there was the usual problem with unequal volume and filter cutoff. Nothing too drastic then.

Hi all. As many of you know who’ve repaired CS-80s (and related), the Yamaha schematics and board layouts are full of errors. In addition, in my work in replacing parts on various boards, it’s

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the yamahacs80 group. File : /EDA Project/easyeda M-board schematic.pdf

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the yamahacs80 group. File : /EDA Project/m-board layout.png Uploaded by

Hello David Get to all the forums and maillists, and you will find them filled with postings about it. Florian

Hi all. Just passing on a couple of articles I’ve seen lately that should be of interest. First, an SY-1 on eBay. Currently $400 with no bids and $550 buy-it-now.

Happy End! 2017-02-27 19:23 GMT+01:00 David Rogoff david@... [yamahacs80] < yamahacs80@...>:

Great news! FYI, when I had similar problems with TSB cap shorts, it was confusing because it didn’t show up as a short to ground. Instead, the short was between +15 and and -15. Something about