Voice activated switch (CB8434E)

This sound or voice relay was found in a Popular Electronics. It includes an amplification stage and can be used as a shield.

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Photodiode Amplifier (CB4846E)
This setting appears multiple times on the site from different sources. This is from a 2000 manual...
20 W Darlington Amplifier (CB9054E)
This amplifier was found in a 1970s documentation. Darlington transistors can be replaced for modern...
Three Phase Motor Protector (CB12109E)
This circuit is from a Modern Electronics from April 1990. The circuit can be assembled with BC558...