This charger was found in the February 1978 issue of Radio Electronics magazine. The circuit is for low current, only 150 mA, and has a 12 V transformer in the power source.
This configuration similar to many of this site was found in 1965 General Electric documentation. Modern...
In the figure we have the configuration of a logic switch with the TTL 7400 circuit. The...
This telegraph microtransmitter for a frequency determined by the coil and the crystal was found...