I bought this large alarm bell for 5 dollars at a Habitat for Humanity Restore. I modified it by bypassing the mechanical oscillator, to make it ring only once per press of the button. I used a MOSFET to drive the bell because the bell was too powerful to be controlled directly. I used it to replace the buzzer in my solar power/ dinner bell system. I needed it to ring only once so my dad couldn't be annoying and hold the button down too long. Also, it could have been so loud that the neighbors might think it was a fire alarm. Its original purpose was to be a security alarm. I thought it would be cool to have a 7 inch diameter alarm bell.
