This constant current charger from 1997 Linear Technology Applications uses common components at the time. The transformer is the critical component, being designed according to the load voltage.
The circuit presented was found in the 1994 Linear Applications Handbook from National...
This circuit, which in our times would be called a shield, can also be used with other loads. The...
This circuit is intended for amplification of signals in the range of 1.8 to 20 MHz. The...