Siren in a box (CB7093E)

Found in Elementary Electronics from 1970, this circuit is a toy for generating different types of sound effects. The circuit is battery powered.

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Small Inverter (CB11943E)
This traditional configuration can provide high voltages for an electric fence, for science...
2 to 24 kHz Low Pass Filter 741 (CB16756E)
We found this filter configuration in an old documentation. It is one of many possible ones that...
Conductivity Meter (CB13503E)
This circuit measures the conductivity of a saline solution, which is affected by the electrolysis effect....