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.
This simple transistorized game that appears in other versions in this section and website, was...
Microsemi Le87557 Differential Amplifier Mouser Electronics offers Microsemi Le87557 single...
In the figure we have an interesting configuration in which we took advantage of the very high...