The operational amplifier used in this circuit is uncommon today, but the configuration can be made with more modern operators. The power supply is symmetrical.
This circuit is from an Electronics World of 1964. The circuit can be made with modern...
The Variable Frequency Oscillator (VFO) or Variable Frequency Oscillator shown in the figure can...
This guitar effect circuit was found in a 2002 documentation. The circuit can be powered by a 9 V...