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Author Topic: K-12 student $20 scope circuit  (Read 2283 times)

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Offline MephitusTopic starter

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K-12 student $20 scope circuit
« on: January 07, 2016, 06:06:45 pm »
Original page: http://www.ece.utah.edu/~ecectools/_Outreach/_Outreach.htm
PDF: http://www.ece.utah.edu/~ecectools/_Outreach/StephenSiebOscilloscope/SSieb20DollarOscRev2.pdf

I was looking around the locally available free EE curriculum and found this rather nifty little circuit project for a PIC controlled and very very basic scope. Thought it would be worth posting for others to use or have as a starter educational project. There are other circuits and such available on the link above. Share and enjoy!
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Offline eugenenine

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Re: K-12 student $20 scope circuit
« Reply #1 on: January 08, 2016, 09:51:35 pm »
Amni reading that correct that they are connecting the pic's ground to 5v?
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Offline SPRX

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Re: K-12 student $20 scope circuit
« Reply #2 on: January 08, 2016, 11:22:33 pm »

eugenenine, it is correct. PIC Gnd should be connected to +5v to achieve specified input of -4.5 to +4.0 V. In the schematic, input Gnd id is also connected to +5v
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Offline Jay_Diddy_B

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Re: K-12 student $20 scope circuit
« Reply #3 on: January 08, 2016, 11:53:34 pm »
Hi,

Don't trust somebody who wires the protection diodes like this:



Jay_Diddy_B

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Offline LukeW

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Re: K-12 student $20 scope circuit
« Reply #4 on: January 09, 2016, 12:01:16 am »
Quote from: eugenenine on January 08, 2016, 09:51:35 pm
Amni reading that correct that they are connecting the pic's ground to 5v?

It might be easier to get your head around it if you "rename" the +5V rail to ground, the ground to -5V and the +9V rail to +4V.

Still looks like a very dodgy design though.
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Online Andy Watson

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Re: K-12 student $20 scope circuit
« Reply #5 on: January 09, 2016, 12:24:34 am »
Quote from: Jay_Diddy_B on January 08, 2016, 11:53:34 pm
Don't trust somebody who wires the protection diodes like this:
Looks like whoever drafted the schematic was having a bit of an "off" day. The button/switch inputs apparently sense the "+5V" ground.

I'm sensing undergrad group-project write-up !

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