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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Wien Bridge Oscillator (CB8699E)
Found in Harris' 90s documentation, this circuit uses a zener as a stabilizer. The signals...
Gain control with 741 and JFET (CB25572E)
This circuit was found in the April 1993 Electronics Now magazine. With it, it is possible to...
40 mA Constant Current Source (CB6632E)
The setting of this power supply is only 0.1%. We found it in a 1969 US documentation. Transistors...