Transistorized AM radio (CB8392E)

Found in a 1980s amateur radio QST magazine, this is the conventional circuit of a medium-wave radio. Coils and transformers are commercial types.

| Clique na imagem para ampliar |

RIAA Preamplifier III (CB958E)
This circuit was adapted from an Italian publication that no longer exists. This is “Onda Quadra”...
Linear thermometer (CB9359E)
This circuit was obtained in an Electronic Engineering of the 90s. The operational amplifiers and...
Alarm with lock (CB8973E)
The basic component of this circuit is a general-purpose SCR. The voltage is according to the...