Hi David
I seemed to understand that according to Crow studies about CS-80 the signal is strangely turned to stereo then re-converted to mono
The signal then gets buffered and sent to the chorusing/tremolo 'OE2' circuit board where the mono signal is turned into a stereo effect when the chorus or tremolo is turned on. Note that if the effects are off, the output signals from the OE2 board are the same. Tracing the audio signal through the OE2 board showed that things were still fine. These signals then proceed to the OE1 board for blending: 4 VCAs are used to 'move' the audio around the stereo image on the OE2 board, and these 4 VCA outputs are mixed back into 2 signals on the OE1 board. The signals then return to the PRA board for final line-level amplification. The output signals from the line amp circuit section were incorrect: the RIGHT signal was fine, but the LEFT signal was very faint. The problem must be in the amplifier circuit for the LEFT channel on the PRA board, then (end quote)
Maybe I'm wrong !
BTW David , being you able to make A/B comparisons , what do you think about ringmodulator in CS-80V 1.5?
Max
----- Original Message -----
Sent: Tuesday, June 21, 2005 10:42 PM
Subject: Re: [yamahacs80] CS-80 ring modulator
oasysfan2 wrote:
>I've been discussing the sound of the CS-80 ring modulator on the
>CS-80V group, and I wanted to ask for your insight here. Listening to
>Richard Lawson's demo,
>
>http://www.rlmusic.co.uk/mals_site/mp3s/cs80_700.mp3
>
>it sounds like the CS-80 RM is mono. i.e. the ring modulation between
>:09 and 0:19 doesn't pan back and forth. What's confusing is I found
>another CS-80 RM example in which the RM sound definitely moves back
>and forth in the stereo field.
>
>http://personal.inet.fi/private/matador/cs-80_user_ringmod.mp3
>
>What am I hearing? Is it because chorus is on (not sure if it is),
>and the RM is subject to the stereo chorus? Thanks for any help in
>better understanding the original.
>
>
The ring-mod is mono. In fact, the whole CS-80 is mono until it gets to
the chorus. Here's the detailed block diagram:
http://www.synthfool.com/schematics/cs80_2.jpg. You can see the the
signal becomes stereo on the OE2 board, which is the guts of the
chorus/tremelo.
David