This circuit is from 1967 General Electric documentation. It uses SUS which are not very common components today. The maximum frequency should not exceed a few kilohertz.
This linear LED scale circuit was found in the February 1992 issue of Radio Electronics magazine. Note...
This circuit was found in an American documentation from 1969. The circuit is a multi-indicator with...
Found in a 90s Popular Electronics, this circuit is intended for amplifying analog video signals....