Subwoofer Filter (CIR25262E)

This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit is part of a home theater sound system.

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Optical trigger (CB20692E)
This Schmitt optical trigger with LDR was found in old documentation. The relay must be sensitive, or an...
Low frequency linear modulator (CB7305E)
Found in an Electronic Design from 1968 this circuit generates a linear sawtooth signal modulated...
Variable pulse generator 2N2646 (CB23921E)
This unijunction transistor circuit was found in Radio Electronics magazine from July 1968. The...