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wohali/VCO153_changes.md

Last active June 21, 2019 22:01
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VCO153_changes.md

Changes in the VCO153 circuit

  • Freq input

    • R65 added
    • R20 changed 150k -> 249k
    • R23 changed 2M2 -> 3M3

  • PWM

    • R64 added (to limit range to 50%-90%...helps with DC offset a little)
    • PWM LVL pot in series with PWM In

  • FM Control

    • R21 changed 51k1 -> 470k
    • FM pot slider -> SPDT
      • one side of SPDT -> R21
      • other side of SPDT -> new R70, 470k
      • R70 ->

  • Exp converter (Q1)

    • R2 changed 680k -> 1M

  • Sine shaper

    • New offset adjust circuit
    • R53 changed 150k -> 100k
    • Missing zener D10
    • Missing R66, (V)R67, R68, R69
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