MATRIXSYNTH: Yamaha CS-01 II


Sunday, April 22, 2007

Yamaha CS-01 II

Two Yamaha CS01's up for auction. Shots via this auction saved here, and shots via this auction saved here.

6 comments:

  1. Title should reflect that these are CS-01 Mk II units.
    Rarer; allegedly have a different filter (I'm not sure of that, the standard CS01 had a filter on a chip module, would be very surprised if this had a discrete one) but, they do have a slider for resonance, instead of a switch. Otherwise, panel layout is Identical, I believe.

    Would love to see some internal pics and part numbers for these.

    ReplyDelete
  2. some archived list online (analog heaven?) documents an exchange between CS01 owners who've modded their units. they did a chip listing (mostly Yamaha custom chips, naturally) and indeed the Mk1 and Mk2 had different filter ICs. I don't think they did a capacitor count though.

    I have a Mk1 with two caps sitting beside the filter. I did a frequency sweep with the triangle voice while looking at the output on the scope - definitely 12db/oct.

    ReplyDelete
  3. I'll bet the auction one will go for more than the nicer BIN one. Just because humans are silly.

    ReplyDelete
  4. "I did a frequency sweep with the triangle voice while looking at the output on the scope - definitely 12db/oct."

    How can you get the filter slope with this test?

    ReplyDelete
  5. Good catch loscha. Post updated.

    ReplyDelete
  6. Answering Anonymous #2 above:
    "frequency sweep with triangle voice for filter slope"

    Lowpass filter attenuates higher harmonics, right? well, a triangle's pretty close to a sine (not too many higher harmonics - mostly fundamental). so at a given filter setting, you should see the amplitude of the waveform decrease as you increase frequency (press higher keys)
    -hooked up output to scope
    -set on 4' triangle voice
    -set filter slider to some lowish-middle setting, no resonance
    -pressed the following keys and, for each key, recorded measured frequency and mVpp output:
    F1, A1, C1, F2, A2, C2, F3, A3, C3.

    -calculated: 20log(mVpp@F3/mVpp@F2), 20log(mVpp@A3/mVpp@A2), 20log(mVpp@C3/mVpp@C2) and, on average, found filter slope to be about -10dB/oct (maybe some noise in my measurement, maybe I should have set the cutoff lower, etc)

    So I guess my Mk1 has a gentle rolloff...

    ReplyDelete

To reduce spam, comments for posts older than one week are not displayed until approved, usually same day. Do not insult people. For items for sale, do not ask if it is still available. Check the auction link and search for the item. Auctions are from various sellers and expire over time. Posts remain for the pics and historical purposes. This site is meant to be a daily snapshot of some of what was out there in the world of synths.

PREVIOUS PAGE NEXT PAGE HOME


Patch n Tweak
Switched On Make Synthesizer Evolution Vintage Synthesizers Creating Sound Fundlementals of Synthesizer Programming Kraftwerk

© Matrixsynth - All posts are presented here for informative, historical and educative purposes as applicable within fair use.
MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH