Found in a 90’s 73 magazine for radio amateurs, this circuit provides a few milliamps of output with -15 V from a 3 V input, when the consumption will be 10 mA.
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...