Test interface (CB8222E)

Found in 90s Popular Electronics this circuit amplifies signals over a wide range of frequencies.

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Electronic trigger (CB8303E)
Found in a 1980s English magazine, this trigger circuit can have different types of inputs...
Square oscillator (CB9100E)
Generating a square signal (50% active cycle), this circuit was found in Siliconix documentation from...
H Bridge bidirectional sensor (CB5397E)
This current sensing circuit for applications up to 10 A has been found in a Linear Technology...