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If you build, design or test anything electronic and you don't have an
oscilloscope
then I've got a treat for you. You can get the full details on
how to build this neat little sound card scope from my website
at HomeDIYElectronics.com you can see the sound card oscilloscope displaying
two signals from the astable multivibrator circuit running
at 1KHz. The waveforms
are from the collector and base of one of the transistors
Start with
a copperless perforated board about 60 mm by 50mm
The circuit has two identical channels
There is an input resistor, a potentiometer
and two protection diodes. Place the components
including the wire posts that I show you how to make
on the website. I used some large trimmers from my junkbox
you can use smaller ones like this or panel mounted
potentiometers like this one. Bend and twist the component
leads on the underside of the board then solder all the joints
attach the cable with the stereo plug on the other end
this goes to your microphone input you could cut one end
off of the standard 3.5mm audio cable to make it easier.
The finished probe with input leads. Red lead is the common.
The frequency feature of this software shows components of the input signal. The square wave input has a 1KHz fundamental with lower amplitude components every 1KHz
You can even do an X-Y plot
to show a nice pattern from the inputs
Don't forget to visit my website at HomeDIYElectronics.com