Hand Soldered LED Oscilloscope -- Episode 408

LED oscilloscopes can be cheap and fascinating tools to look at some curvy signals, but the resolution is so poor! When Dave decided to build an XY LED oscilloscope, he wanted to go bigger as well and solder up 400 10mm LEDs. With an XY oscilloscope, you can take a look at Lissajous figures and even watch oscilloscope music on it!

Bill of Materials

Product Name	Manufacturer	Quantity	Buy Kit
LED	KINGBRIGHT	400	Buy Now
PCB, Pad Per Hole	MCM	1	Buy Now
74HC540N	NEXPERIA	3	Buy Now

Additional Parts:

Product Name	Quantity
LM3914 Bar/Dot LED driver	1
1k, 2k2 1/2W resistors	1

Hand Soldered LED Oscilloscope

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kmikemoo over 6 years ago

That was really cool. I never knew such a thing existed. It's kind of hypnotic. Put something like that on your desk and just watch the people get pulled in.
I wonder if I can voltage divide this to get it to display mains voltage...
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davedarko over 6 years ago in reply to kmikemoo

Thanks! You would need another frequency to show mains, otherwise if the frequencies are the same then you will only get a diagonal line. There are some pretty cool oscilloscope music videos on youtube that I wanted to display on it, too. I need to fix some of the matrix glitches and shift the audio from AC to DC...

here's an example for the oscilloscope music
https://www.youtube.com/watch?v=5WBWIKnr0Os
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davedarko over 6 years ago in reply to kmikemoo

Thanks! You would need another frequency to show mains, otherwise if the frequencies are the same then you will only get a diagonal line. There are some pretty cool oscilloscope music videos on youtube that I wanted to display on it, too. I need to fix some of the matrix glitches and shift the audio from AC to DC...

here's an example for the oscilloscope music
https://www.youtube.com/watch?v=5WBWIKnr0Os
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