Obtained in a 1969 Ferranti documentation, this circuit dissipates only 2.2 mW with 4.5 V. The circuit can be designed based on modern equivalent transistors.
This circuit, which can be used on an optical link, is suggested by the Texas Instruments...
The operating voltage of this circuit is 18 V, and the source current is 3.5 A. The circuit is...
This circuit is from the time when seat belts were still being adopted. Obtained from a 1976...