Soundcard oscilloscope probe with led protection

168

01:30:40

Here is a good sound card probe,it uses 2 LEDs to protect the computer from too much voltage. The LEDs will clamp the voltage when it goes over the forward voltage drop

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published 9 years ago

lmccoig

9 years ago

Thanks for sharing this circuit.

lmccoig

9 years ago

Just thinking, how about second circuit for two channel scope if stereo input?

hurz

9 years ago

But why the asymmetric LED threshold voltages 1 & 2V?

lmccoig

8 years ago

Several devices I have only allow built in microphone with oscilloscope software and external mic input is not active to be displayed.

lmccoig

7 years ago

My current sound card is 150 to 4000 Hertz range and that frequently limits

lmccoig

7 years ago

My current sound card is 150 to 4000 Hertz and lower limit is factor that must be considered.

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