IR remote control emitter (CB7020E)

This circuit was found in 1980's Radio Electronics. The circuit produces a 1500 Hz modulate 35 kHz. The components used are still common.

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Nuclear Radiation Detector (CB12599E)
This circuit uses a large surface diode to detect radiation (alpha and beta particles, in addition to...
Phonographic preamplifier (CB12883E)
This preamplifier for the phonographic capsule was obtained in an Argentine publication from 1973....
Zero Crossing Detector (CB12450E)
This circuit is from a 1993 publication and can be implemented with any optical isolator that has...