This circuit was obtained in a 90s Popular Electronics. It is used for tuning on AM radios. The field effect transistors used support equivalents.
This simple experimental circuit using only transistor produces a tone given by C1 and C2. Tone is...
This circuit was found in Popular Electronics from 1993. The 1458 consists of a double 555. The...
This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio...