We found this circuit in December 1986, Radio Electronics magazine. It uses 3 inverters and has the frequency determined by the crystal. The power supply is 5 V.
This circuit was found in 1966 General Electric documentation. The circuit uses components from the era...
We found this circuit in a magazine 73 for radio amateurs from the 80's. The circuit makes use of an...
This circuit uses one of the first comercial transistor and is from a 1958’s magazine. Tone...