Hi Jesper,
this is exactly the thing I want to know. The III is the four channel device, as far as I know and the IV the two channel device, but the IV is not only half III. The IV has no master section with run generator and lfo, but may be the single channel is also different to the III.
I repaired Wolfgangs III two month ago. It has no oscillators at all, the tone is nothing but a resonating ladder filter, copied 1:1 from good old bob moog. If you turn the Noise/Tone pot to noise, the resonance is completely off, so also the impact click will not be audible. But on my schematics of the III there are 3 3086 per channel, these are containing transistor arrays to build this filter.
What I am wondering about is this pot on the IV called "Waveshape". Is this an osc or only an lfo? Maybe a good photo of both solder side and parts side would help.
Michael
----- Original Message -----
From: jesper@...
To: Simmons_Drums@yahoogroups.com
Sent: Monday, April 02, 2007 3:01 PM
Subject: [Simmons Drums] SDS-III vs SDS-IV internally
Hi List!
I'm looking inside my newly arrived SDS-IV due to a dead oscillator and I'm
comparing it to the schematics of SDS-III. Is it just me or aren't they
alike? There are no 3086's on the SDS-III schematics but quite a few in the
SDS-IV...
Anyone with a SDS-IV schematic around?
electronically yours, jesper
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