Third Order Low Pass Filter (CB25264E)

This circuit was found in the December 1990 issue of Radio Electronics magazine. It was used in a home theater sound system.

Varicap Variable Frequency Oscillator (CB4587E)
The great advantage of the circuit shown in the figure is that its frequency is controlled by a...
TTL to MOS Converter (CB5106E)
This circuit can be used as a shield for microcontrollers. The circuit is from American...
Transistorized Oscilloscope (CB11568E)
Mounting an oscilloscope is the dream of many of our Internet users, although it comes up against...