Re: Low spec 'scope.

On a sunny day (Wed, 28 Aug 2024 08:39:25 +0100) it happened
liz@poppyrecords.invalid.invalid (Liz Tuddenham) wrote in
<1qyzrl3.ocj6lm4e4yaN%liz@poppyrecords.invalid.invalid>:

The recent thread on high-end oscilloscopes has reminded me of a project
that I shelved some years ago and might be due for resurrection:  I am
looking for a real-time display about 3" x 4" that can behave as an X-Y
oscilloscope with a bandwidth of about 100 Kc/s; a flat panel would be
ideal. 
>
Currently I am using an actual X-Y oscillocsope to monitor the output
from a stereo gramophone cartridge, which allows me to check historic
discs for damage or faulty recording geometry.  The tube is about 14"
long, which means it has to be a standalone shelf unit and I can't build
anything like it into portable equipment.
>
I've not come across anything like this, but I'm sure such things either
exist or can be made by adapting something that is readily available.  I
have never been down the digital route, so anything that would need a
lot of programming from scratch will never get built.

This was an experiment:
 https://panteltje.nl/panteltje/pic/scope_pic/
works for audio, has spectral display too,
can also send screendump as text file to Usenet.
Control via RS232 or some buttons if you can code.

Cost? Maybe the LCD is the most expensive part, 5 dollars?
Display has low resolution, so I did a shift right a couple of times to divide the output.
A better display will give better resolution.
There are plenty of single chip cheap digital scopes on ebay.
 https://www.ebay.nl/itm/315279795435
  have not tried that one :-)