This circuit implements two logic functions at the same time. The diodes are for general use and the resistors have typical values of 2k2 for logic of 5 V.
Found in an English publication from 1967, this circuit generates 5 kHz signals with harmonics that...
Found in the June 1962 Radio Electronics magazine, this circuit uses 4 transistors. The range...
This circuit is suggested by Motorola and makes use of a phototransistor with its own...