AC voltage probe (CB8185E)

This circuit for voltages up to about 20 V was found in a 90s Popular Electronics. The LED can be of any type or color.

Car Amplifier (CB24019E)
This amplifier stage was equipped with a Motorola radio from the 70s. The transistors were from...
Crystal Pickup Preamplifier (CB16752E)
This version of the preamplifier is one of many that the reader will find on this website using the...
10 A Automotive Power Source (CB17019E)
This 13.8 V power supply with 10 A was found in a 1997 documentation. It is intended for the...