This circuit was obtained in an 80s documentation on telephony. The components used are TTL, and the power must be made with 5 V.
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...