Alarm siren (CB26231E)

This circuit with two 555s was found in the Encyclopedia of Electronic Circuits volume 5 of 1995. The power is high due to the use of 2N3055.

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Schmitt Trigger (CB21849E)
We found this circuit in the 1974 Ferranti transistor manual. Transistors are from the time, being...
Linearity corrector for thermistor (CB21387E)
This temperature sensor circuit was found in an old American documentation. The components used...
Bass and Treble Filter (CB19812E)
This separator filter is from an old publication. The capacitor can have 10 to 47 uF of the...