This simple 12 V power supply with current up to 2 A was found in a Popular Electronics from the 90s. The zener diode is 14 V and transistor Q2 can be a TIP42.
I found this circuit in a July 1982 English magazine. The circuit is still viable by simply using...
This simple general-purpose circuit was found in a 1987 publication. It is a simple preamplifier powered...
This configuration has already been found in other manuals, as the LM117 is manufactured by...