PB101 Sync VCO

The Sync VCO is actually a pair of oscillators, a normal voltage controled oscillator and an other oscillator that syncronice the first one. It comes with a triangle and a square wave output.
In changing the capacitores one can change the range for the oscillators. The value should be between 10 and 50nF.

The circuit is based on a classic Voltage Controlled Oscillator (VCO). One can find for example the basic schematic in the data sheet of the LM358 OpAmp.


Schematic

That's the schematic for one oscillator:


Hardware


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
  • Electrolytic Capacitors:
  • 2 x 10µF
  • Diodes:
  • 1x 1N4148
  • Semiconductors
  • 2x BC547 transistor
  • 2x LM358 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
  • 1x mini switch
  • Potentiometers:
  • 2x 10k
  • 1x 100k