Negative Feedback Stage (CB6131E)

This circuit is from a 1967 US publication. The configuration can serve as a basis for designs with modern components.

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Zener Coupling (CB4139E)
According to the consulted American publication of the 1980s, a zener diode can be used for DC...
RIAA Preamplifier III (CB958E)
This circuit was adapted from an Italian publication that no longer exists. This is “Onda Quadra”...
Horizontal Bar TV Generator (CB524E)
This circuit produces horizontal lines or bars in a analog TV tuned between channels 2 and 5. L1...