This receiver was found in a 1924 book by Gernsback. The circuit uses three tubes and is powered by 3 batteries of different voltages, common at the time.
This static switch or electronic contactor was found in a 1968 Motorola publication. The triac...
This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is...
This circuit measures the power of a transmitter being sandwiched between the antenna output and the...