The circuit is from Ferranti's 1974 transistor manual. Transistors are general purpose types, and the output waveform is rectangular. Components can be changed to other frequencies.
This circuit is from a Popular Electronics from 1993. The magazine is no longer printed, but the...
August 2017 - The PIC32MM microcontrollers of the Microchip 32-Bit Family can be obtained from...
This circuit was found in documentation from the 90s. Its purpose is to dial a programmed number...