Electronics > Beginners

Analog Oscilloscope Dual Trace 20-100MHz For Under $50 In The USA?

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admiralk:
This is a little too far to pick up, but is an example of were to look. https://tampa.craigslist.org/pnl/ele/d/saint-petersburg-oscilloscope/7000822240.html

I got the 60 MHz Goldstar they had a while back and it works fine. I also got a LG with a function generator for $25 due to a bad channel in the scope, but that seems to be working fine since I got it home. Colleges are probably the best place to look besides hamfests. Just do not expect to find one tomorrow.

james_s:
It's true that it's always a risk, but when one has no other viable option it's a risk I think is generally worth taking. They could also overextend themselves and buy something new that is over their budget and accidentally blow it up just as easily.

Ultimately life in general is a series of calculated risks. Make halfway sensible choices and you can usually come out ahead over time.

MarkF:
+1 on scrubbing home address.  Just your "state" would be as far as I would go.


The entry level PicoScope might be a good starter setup.
10 MHz scope, two probes and built-in signal generator for $139 minus the EEVblog discount (6%).
https://www.tequipment.net/Pico/2204A/PC-Based-Oscilloscopes/?v=0

Personally, I'm not big on USB scopes.  I prefer stand-alone units.
A PicoScope would fit the bill until you can afford a DSO.

rstofer:
Well, I really like the Analog Discovery 2 so I suppose I can't complain about USB scopes. 

It's the USB thing that worries me.  I don't want an 'oopsie' on my part trashing my computer.  If it would work, and it should, I would run the gadget through a powered USB hub.  That doesn't provide total isolation but it's a start.  There are USB isolators but they tend to be pretty slow.  Or at least the ones I have seen.

Maybe something like this:
https://www.amazon.com/Adafruit-USB-Isolator-Isolated-ADA2107/dp/B01GQFVB32

Everybody probably has an old clunker computer laying around.  Use that for the display and save the high dollar laptop for more important things.  Assuming the OS is current enough to support the PicoScope software.

ccktek:
Have you found anything yet?  If not, I have a good, working TEK 2215 that's yours for the cost of postage from Portland OR.

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