This circuit was found in an English magazine from 1977. Signal inputs and outputs must be shielded, and the circuit can be powered by battery, since its consumption is low.
This circuit is based on the LT1004, LT1167, LT307 or LT1490 from Analog Devices. The circuit was...
This circuit, indicated by Texas Instruments, uses a high voltage regulator and a Darlington also...
This circuit is suggested by Texas Instruments and can be used on an assembly line to drive an...