I found this circuit that can make my laptop work as oscilloscope:
Can this circuit work with my android phone while am using this app?
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1Most audio inputs are AC-coupled, so you won't be able to measure DC, and limited to maybe 20 kHz of bandwidth – sstobbe May 26 '17 at 16:32
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THere are audio scopes for Android too. https://play.google.com/store/apps/details?id=com.nchsoftware.pocketwavepad_free – Tony Stewart EE75 May 26 '17 at 16:32
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1One reason the above circuit won't work, is a PC has a separate 3.5 mm jack for a microphone, and a smartphone uses a single four-conductor 3.5 mm jack (TRRS) for both microphone and headphones. – tcrosley May 26 '17 at 16:36
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stereo jakcs no work for audio input in smartphones......! – gilberto de oliveira Paula Aug 14 '21 at 21:29
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The Google Play page for the app you linked has a section for microphone support which includes a link to an instructable for a circuit:
***** Microphone SUPPORT ****** The second option is the microphone input to the android device. This can be used to attach a scope lead to the jack socket. More information can be found at the following website. http://www.instructables.com/id/A-Preamplifier-for-Smartphone-Oscilloscopes/ Features include, triggering for different impulse and continuous signals. In addition to this there is level measurement and fundamental frequency readings
DigitalNinja
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