This circuit is from the 80's documentation. The integrated circuit is from the time but can be implemented with modern equivalents. The power supply must be symmetrical.
We found this circuit of a transistor siren in a recent English publication. All components are still...
This circuit was found in the Spanish magazine that no more existis Mundo Electrónico, in a...
This circuit can operate with 5 uV to 1 mV input signals from low impedance sources such as...