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PB109 VCO II

An other voltage controlled oscillator. It comes with a really beautifull shaped sinewave - stabel and with the same peak to peak over all frequencies. One can switch between square, triangle and sine wave. In the square/triangle mode one can change with a potentiometer from triangle to saw or the duty cycle of the square wave. In sine wave mode one can shape the sine wave to an interesting “sea saw” wave.
All OpAmps are the rail to rail MCP6002 ICs. For a perfect sine wave one should trim the 500R trim potentimeter to a symetrically wave.



Schematic



Paper PCB


Parts

  • Resistors:
  • 1x 1 kOhm
  • 1x 4.7 kOhm
  • 4x 10 kOhm
  • 10x 47 kOhm
  • 4x 100 kOhm
  • Capacitors:
  • 1x 22 nF
  • 1x 10 nF
  • 2x 10µF
  • Diodes:
  • 1x 1N4148
  • Semiconductors
  • 3x BC547 transistor
  • 2x MCP6002 OpAmp
  • Mechanical:
  • 2x IC socket, 8pins
  • 1x pin strip 1×14
  • 2x pin header, female 90° 1×3, 1×2
  • 2x pin header, male 90° 1×3, 1×2
  • 4x jumpers
  • 3x mini switch
  • Potentiometers:

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