Found in a 1970 EEE, this circuit can be applied to TTL ports. The supply is 5 V and the frequency, which depends on the crystal, can be between 1 and 3 MHz.
This circuit was found in the September 1974 issue of Radio Electronics magazine. The circuit uses...
This circuit was obtained from the February 1992 Radio Electronics magazine. In it, a bar of 4...
This inverse transistor breakdown circuit was found in a 1967 documentation. It applies to modern...