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A project log for RGB LED Oscilloscope

using cheap eBay kits, some cheap eBay RGB LEDs to make an LED oscilloscope (inspired by Ted Yapos - LED Oscilloscope Mk. II)

davedarkodavedarko 02/06/2017 at 11:474 Comments

My favorite time of a project cycle!

partspriceamounttotal
100pcs common anode CA RGB LEDs 3.41 EUR13.41 EUR
CD4017 NE555 LED chaser board 1.15 EUR11.15 EUR
LM3915 "funny" diy kit board1.50 EUR34.50 EUR
Total9.06 EUR

Thanks to current political events that makes: 9.73 USD

With a little creative air wiring this will make a lovely solder Sunday :)

Discussions

Ted Yapo wrote 02/06/2017 at 12:43 point

Just in case you didn't notice the difference, the LM3915 has logarithmic steps - ideal for a VU meter display, but not as good for drawing accurate waveforms.  It would make a cool RGB music display :-)

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davedarko wrote 02/06/2017 at 13:03 point

Thanks for pointing that out! - I was aware of that, but could have mention it somewhere :) 

I also bought 5 LM3914 to switch out, but I thought that the max speed overall would be pretty good/best for audio stuff and I plan to play around with some RC filters - basically keeping some options :) 

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esot.eric wrote 02/06/2017 at 13:07 point

Glad you bought so many 3914's, 'cause it just occurred to me two (or four?) of those could be used to make an X/Y 'scope, with three Lissajous patterns :)

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davedarko wrote 02/06/2017 at 13:19 point

@esot.eric - that's a good idea! 

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