Sensitive triac controller (CB7864E)

This circuit, which can be used as a shield, was found in a 90s Electronic Design. The circuit uses a diac and the transistor can be general-purpose.

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Variable Frequency Crystal Oscillator (2) (CB12257E)
Frequencies from 1 to 10 MHz can be obtained with a small adjustment of the variable in a narrow...
Two Controls Flasher (CB16241E)
This flasher of two incandescent lamps was discovered in a 1983 documentation and it has two...
Treble Booster (CB12322E)
We found this trebble booster circuit in a 1990 documentation. The components are current, and the...