555 Timer Variable Loud Buzzer
This buzzer toy is very loud when hooked up to a large TV speaker you pulled out of that old broken TV. Also includes to wires attached to the button, when you touch them it makes dirty sounding buzzes with lots of interference.
You will need a button, 555IC, 3.3uf capacitor, 500k variable resistor, and wires. This project is based on the 555 Mind Mangler I found at instructables.com http://www.instructables.com/id/555-Mind-Mangler/