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.
We found this circuit that was part of a teaching set in a Radio Electronics magazine from June...
This circuit generates control signals for stepper motors. We found it in a 90s Popular...
This circuit was originally found in a 1968 publication. In the current version, a source must be...