Band Pass Filter (CB19687E)

This bandpass filter has a simple feedback system. The component values can be calculated using the formulas found in the math section.

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Black light (CB7898E)
This circuit was found in a PE Hobbyst Handbook of 1989. It uses a black light fluorescent of the time....
Phase Shift Circuit from 0 to 360º (CB14621E)
This circuit can shift the phase of a signal from 0 to 360º. FETs admit equivalents and the...
Power control (CB23570E)
Using 5 transistors, one of which is a unijunction, this circuit was found in Radio Electronics magazine...