We found this circuit in a 1982 documentation. It uses a CA3140 or equivalent operational amplifier and does not require a symmetrical source. The output is 1 Vpp wide.
This circuit was found in July 1986 Radio Electronics magazine. The maximum current is 1.5 A. The...
This circuit activates 5 LEDs according to the level of the analog input signal and can be used...
This circuit is from an old American documentation and its use in motorcycles with 12 V is...