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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Variable Attenuator (CB14144E)
The circuit shown in the figure was suggested by National Semiconductor in its 1994 Linear...
LED Photo Flasher (CB20948E)
This circuit can be controlled by an LDR causing an LED to flash at a frequency given by C2. The...
Simple Hybrid Switching Power Supply (CB26022E)
This hybrid power supply circuit was found in the August 1997 issue of Electronics Now magazine. The...