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 circuit was obtained in the magazine Eletronica Prática 9 of 1977. The Italian magazine no...
This circuit was found in the 1960 Mullard transistor reference manual. The circuit can be...
The circuit presented may use any general purpose transistor. The indicator is an LED and...