This commercial receiver from the year 1958 uses two AA cells as Power supply. The circuit is intend to receive MW station and the transistors are germanium types not easy to find today.
In the figure we have the way to compensate an operational amplifier. The circuit is valid for...
circuit is used to increase the sensivity of a relay. A 50 to 100 mA relay can be triggered with...
a This very low voltage regulator supports input voltages from 1.7 V to 5.5 V and is suitable for IoT...