Fog horn electronic circuit project

A very simple fog horn electronic circuit project can be designed using three transistors and some other common electronic parts . This fog horn electronic circuit project is activated when the push button is pressed .

When the push button is pressed the 100uF capacitor will take time to charge and this will provide the rising pitch and this will provide the rising pitch and volume . When the push-button is released, the level and pitch will die away. This electronic project circuit must be powered from a 9 volt dc power supply ( it can be powered from a 9 volt battery) .