Suggested by a Philips documentation from 1970, this circuit uses period components, operating at 50 Hz. The current consumed is 10 A and the input voltage is 12 V.
Found in a QST from the 90's this circuit is suitable for the medium and short-wave range. |...
We found this circuit in documentation from the 1950s. The circuit basically applies to germanium...
We can also use the 4011 on this CMOS circuit that makes use of a crystal headset. The power...