Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
The integrated circuit used is uncommon today. The numbering in parentheses is for the second...
This circuit uses two relays to reverse the direction of rotation of a direct current motor. It...
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...