Fourth-Order High Pass Filter 741 (CB25597E)

This 100 Hz filter was found in the August 1993 issue of Electronics Now. The components can be modified to operate at other frequencies.

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5 V x 2 A Power Supply (CB24187E)
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Telephone Line Simulator (CB16790E)
This circuit allows you to simulate an analog telephone line for the repair and testing of...
4-Quadrant Multiplier (CB24753E)
Found in July 1983 Radio Electronics magazine, this circuit uses a transconductance operational...