What’s All This Hassler Spice Stuff, Anyhow? (.PDF Download)

Back in May 1995, Bob Pease wrote an article about the “hassler” circuit used by analog great Bob Widlar. The circuit sensed loud voices and would emit a near-ultrasonic squeal to dissuade further yelling or boisterous behavior. Widlar designed the circuit to quiet anyone yelling in his office. It also

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