Motion Detector (CB6662E)

This Philips circuit of the 70's makes use of components of the time. The DZD40 is an uncommon integrated circuit today.

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Squarer Oscillator LM139 (CB4008E)
This traditional configuration that any Series 139 comparator can use is found in the 1990...
Piezoelectric Transducer Amplifier (CB13095E)
The circuit shown in the figure can be used to detect vibrations or to provide amplified acoustic...
Mini Organ (CB21653E)
This toy organ was found in Popular Electronics from January 1967. It can be constructed from...