This is a small Voltage-Controlled Oscillator - the heart of every analog synthesizer. It provides a square and a triangle wave, and it could be hard synced, too.

The OpAmp is a rail to rail MCP6002 from Microchip.

It is designed to use for experimts and development together with a breadboard.

If one wants to use it as a sound source one should put a resistor and a 47µF capacitor to the output:

 square out----470 Ohm-----||-------Line Out
                        |
                      120 Ohm
                        |
                       GND

 triangle out----470 Ohm-----||-------Line Out
                         |
                       470 Ohm
                         |
                        GND                      

vc_oscillator_12.zip

• Resistors:
• 1x 1 kOhm
• 2x 10 kOhm
• 1x 12 kOhm
• 6x 47 kOhm
• 1x 100 kOhm
• Capacitors:
• 1x 3.3 nF (foil)
• Electrolytic Capacitors:
• 2x 10 µF
• Semiconductors:
• 1x LED
• 1x OpAmp MCP6002
• 1x BC547 transistor
• Mechanical:
• 1x IC socket, 8 pin
• 2x pin strip 3 pin
• Potentiometers:
• 1x 100 kOhm

The Voltage Controlled Oscillator was designed by Wolfgang Spahn 2020.
It is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.