This circuit was found in Ferranti's 1974 transistor manual. The transistors are from the period and the frequencies generated are between 50 Hz and 2 kHz.
This circuit was found in the July 1969 issue of Radio Electronics magazine. It also appeared in...
We found this circuit in the August 1994 Electronics Now magazine. The circuit is based on the...
This 4.5 MHz oscillator, or according to the crystal, was found in American documentation from the...