Hi Folks,
I need some troubleshooting help on an electronic project that I built
about a dozen years ago. I built an electronic sensor that turns my dust
collector on and off whenever I turn on one of my woodworking pieces of
equipment (table saw, planer, jointer, etc.). This has worked fine until a
while ago. Now I have to manually start and stop the collector with a
by-pass switch. When I looked at the sensor it had blown the fuse (250
volt, 2 amp) and also one of the resistors (3.3k, 2 watt). I replaced the
fuse and the resistor. When I started one of my machines the dust
collector did not start so I immediately turned off the machine. The fuse
was not blown but the resistor was to hot to touch. I think had I left the
machine on longer the resistor would have blown and then the fuse would
have followed suit.
So, after all of that I need help in finding out what could be causing
this. This sensor has 2 transistors, some capacitors, several resistors, 4
diodes, rectifier, relay, potentiometer, and a fuse. I have 3 jpegs that I
can send to anyone that would like to give me a hand in this. They cover
the complete article along with schematic and parts list.
Also, how do you check a transistor to see if it is good. Does it have to
be out of the circuit.
Thanks for any and all help,
Jim V.
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