Hello. I am currently in school for EET. I like to go online and find circuits to build with my xk-700 trainer kit. The other day I built the Buzzit circuit which is suppose to make different alarm type sounds. So I built the circuit and somehow it didn't do what it should. However I picked up a radio station and was able to change it with the potentiometer (spelling). I took it apart and now when I try it again, I cant find how I did that. Would anyone know what I did. HEre were the active components. 1M variable resistor or potentiometer, 33K, 1K, pnp and npn transistor, 100n capacitor and speaker.