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.
Taken from a 1954 book by Rufus Turner, this amplifying step with PT2A transistors provides an...
This circuit was obtained from an American documentation from 1976. The circuit can be adapted to...
This oscillator can be controlled by light if we use an LDR as a sensor, or by temperature, if we...