Infrared detector (CB7814E)

This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits equivalent and the phototransistor can be of any type.

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Hartley Oscillator (CB4255E)
In the figure we have the typical configuration of a Hartley oscillator. This circuit generates...
Photo Relay with the 2N3055 (CB12035E)
Carefully removing (and a lot of work) the cover of a metallic 2N3055 to expose its joints it...
Electronic Bait (CB4568E)
This fish flame circuit was found in a 1971 magazine. The circuit can still be mounted with BC558...