Audio Booster (CB6181E)

This reinforcing stages from a 1960s documentation. No information is given about the transformer and the transistor admits equivalents.

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Photoelectric Alarm (CB16921E)
This circuit is from an old European documentation, already influencing the unijunction oscillator that...
Triggered amplifier (CB9007E)
Being able to function as a shield, this amplifier was found in documentation from the 70s....
Photodiode Amplifier (CB11549E)
This circuit is suggested by the Texas Instruments Linear Circuits Applications, based on the FET...