We found this circuit in a 1962 publication by General Electric. The circuit applies to common fluorescents in the 117 V power grid but can be changed to other grid voltages.
Capacitance to voltage converter (CB6075E) This Texas Instruments circuit can be used on a...
The signals from this circuit obtained from the 1965 Radio Shack documentation are picked up from...
Found in Popular Electronics from the 1980s, this circuit uses two operational amplifiers from...