Variable Frequency Oscillator (CB22465E)

This VFO circuit generates signals from 2 Hz to 50 Hz. We found it in Popular Electronics from 1992. Transistors are common general-purpose types.

5 to 15 V x 50 mA Converter (CB26058E)
This circuit is based on the DCP010515 integrated circuit found in the August 1998 issue of...
Tachometer with Direction of Rotation Indicator (CB11572E)
The circuit presented is from an old magazine having been translated and published in a national...
900 MHz Amplifier THS3491 Using Single Source (CB19657E)
The configurations of the two previous circuits can be modified to operate with a simple power...