On Tuesday, May 11, 2021 at 5:48:49 PM UTC-4, bruce bowser wrote:

Use your laptop as an oscilloscope (app)
-- https://www.instructables.com/Use-Yo...-Oscilloscope/

20Hz to 20 KHz is barely usable for audio. There are cheap digital scope kits on Ebay. That article requires an app that sells for $10. Why not add a bit more and get something that actually works?

https://www.ebay.com/itm/264678652376 is DC to 200 KHz and is under $20.

My current scope is a Tektronix 2465A. It is four channel, and its -3dB point is 350 MHz. I got it for $189.42 on Ebay.