The TAA300 integrated circuit is not common today. In fact, the circuit shown is from a Dutch Philips documentation from 1969. The output is 8 ohm speaker and 9 V power supply.
This configuration was found in old documentation and is valid for most general purpose NPN...
This circuit uses a capacitor to store energy. The capacitor is charged by closing S1 by a moment. Them,...
This circuit was obtained from a Popular Electronics of the 80's. It is set to a certain pulse...