The circuit shown is for testing both signal diodes (low current) and rectifiers (high current). The circuit is from a 2000 Poptronics, and the transformer has a secondary winding of 100 to 300 mA.
With this circuit, of a 1977 Radio Shack documentation, it is possible to demonstrate the...
In this charger, the charging current is basically limited by the LEDs. The transformer is a low...
This circuit was obtained in a 1986 documentation consisting of an active frequency divider for...