Reverse polarity protection 2 (CB22140E)

This circuit has an improvement over the previous one as it also has an LED indicator for correct polarity.

Small Resistance Meter (CB17219E)
This circuit, with the help of a 15 V x 1 A source, allows to measure small resistances,...
1 W LM386 Amplifier (CB15589E)
With only one integrated circuit and few additional components, this amplifier has an output power...
Loop Antenna Tuner (CB26262E)
This antenna tuner was found in a 1995 publication in the 1993 Electronics Hobbyists Handbook. The coil...