Obtained from a 1969 neon lamp documentation, this circuit shows how to assemble an indicated circuit triggered by - 24V pulses. The neon lamp is of the era type.
This circuit can operate in a 100 dB range with signals of up to 100 MHz frequencies. Similar...
This audio level indication system for microphones was found in Radio Electronics from the 90s....
This circuit was found in a 90’s Electronic Design. The circuit uses components that are still...