Temperature control (CB21275E)

This circuit was found in an Electronic Design from the 90's. It makes use of components from the time. Triac is according to the controlled load.

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Musical Horn (CB23653E)
This circuit was found in a Radio Electronics from May 1965. The transistor is a power transistor and in...
High pass variable filter (CB7571E)
Found in an American paper from the 90's, this circuit can be adjusted to pass frequencies above 30 to 300...
Constant Volume Amplifier (CB26275E)
This circuit is from a 1990s publication by William Sheets. The circuit consists of a stage whose...