6 V x 5 mA regulator (CB21537E)

This 6V regulator with FET was found in an old Electronic Design. FET and transistor admit modern equivalents.

Simple Symmetric Power Supply (CB12663E)
The power supply shown has the circuit shown in the figure, and transformers of 5 + 5, 6 + 6, 7.5...
Simple Continuity Test (CB20416E)
This sensitive continuity test uses two transistors and has a common LED as indicator. The input...
Low Frequency Rectangular Generator (CB1448E)
This circuit was obtained in an American publication of 1977. The circuit generates rectangular...