This JFET amplifier stage was found in the Encyclopedia of Electronic Circuits Volume 5 from 1995. Any JFET can be used and the bias controlled externally.
This filter can be used to eliminate hum in sound equipment. Operational amplifiers can be 741 and...
This signal amplifier for ATV in the 427 to 439 MHz band was found in a magazine 73 for radio...
This simple three-LED sensor uses an NTC at the input. The circuit is based on an uncommon...