I recently found this web site which showed how to build the "ultimate continuity tester." The link is here http://electronicdesign.com/analog/ultimate-continuity-tester-hides-many-tricks-its-sleeve
I built the tester and followed the schematic very carefully on a bread board and have rechecked several times. The tester has a buzzer attached, but it will not buzz when the probes are contacted, the buzzer will only make one chirp per contact. I'm assuming the problem is with one of the transistors or the resistors feeding the transistor. I would appreciate any ideals as to what the problem might be. Here is a link to the schematic http://electronicdesign.com/site-files/electronicdesign.com/files/archive/electronicdesign.com/files/29/19768/fig_01.gif
Thanks
I built the tester and followed the schematic very carefully on a bread board and have rechecked several times. The tester has a buzzer attached, but it will not buzz when the probes are contacted, the buzzer will only make one chirp per contact. I'm assuming the problem is with one of the transistors or the resistors feeding the transistor. I would appreciate any ideals as to what the problem might be. Here is a link to the schematic http://electronicdesign.com/site-files/electronicdesign.com/files/archive/electronicdesign.com/files/29/19768/fig_01.gif
Thanks