Voltage divider (CB21650E)

This precision circuit, which also functions as a bridge, was found in a February 1967 Popular Electronics. The circuit requires precision resistors.

Symmetrical 15 V Power Supply (CB19622E)
This source is used to supply circuits with operational amplifiers, being originally created for...
Square Wave Generator (CB19372E)
The transistors in this 80's documentation project may be BC548, the most modern equivalents of...
Constant Current Source for LEDs (CB915E)
This circuit uses a FET to drive an LED with constante currente. The current up to 20 mA can be...