Found in a 1969’s EDN, this circuit provides 4.5 V with a 100mA current for digital logic. The circuit uses transistors from the era.
This version of triac control is from a 1968 documentation. The circuit uses components from the...
This circuit emits a signal in the AM range, whose modulation frequency depends on the intensity of the...
In this circuit the CA3140, an operational amplifier, is used as a comparator with the zener diode...