This Intersil circuit was found in a 1980s documentation. Operational are of the time, but current equivalents can be experienced. The graph with the circuit performance is given next to the diagram.
We obtained this circuit in a Maxim documentation from the 90s. The circuit is based on the...
This indicator or VU meter for stereo amplifiers was found in a 90s Radio Electronics. The...
This circuit was found in 1967 General Electric documentation. The transistors of the time can be...