This circuit was suggested by National Semiconductor in one of its manuals. The LM108 integrated circuit, uncommon nowadays, can be replaced by an equivalent. The power supply must be symmetrical.
In the figure we have an oscillator for microcontrollers capable of operating in the frequencies of 10,...
This circuit is from a French book from 1981. The components used are common and the indicator...
This circuit was found in a 1986 documentation and can use any operational amplifier like the 741...