DOORBELL SOUND
Categories : Series 2 Voice & Sound Generator ,  Ringing Alarm Sound , 
This economical two-transistor project can be put together by a novice in less than 15 minutes. Ideal as a class-room exercise in soldering and basic transistor function the FK240 comes complete with a 8 Ohm 0.25W speaker. The project can be practically applied in domestic and retail applications.
Technical Specification