Found in an RF Design from the 90's this circuit is intended for crystals of less than 1 MHz. Transistors are types of general use today.
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...