This balance indicator for stereo amplifiers was found in an 80's Elektor. The components used are common. Zeners are 1.8 V or close to that value.
This antenna amplifier or booster for receivers from 100 kHz to 30 MHz was published in a...
Found in a 1993 Electronics Hobbyst Handbook, this passive circuit can be used with common...
This circuit was obtained from a 2005 Linear Technology application manual. The circuit is...