Nice I built a LED oscilloscope based on the lm 3914 from 13 years ago, Back then i use smd led in order to make it it was 20 horizontal × 30 vertical That gave me a 600 dot . with two signal inputs and a trigger circuit. It served me very well with maintenance until I replaced it with an oscilloscope with a tube screen any way thanks for posting
O amigo eu sou um escrito no teu canal e esse projeto de osiloscopio de Leds ficou top Eu já tentei fazer igual mais não consegui você passaria o esquema elétrico desse?
That would be W. Forrest Mims to you. 8) Why did you use discrete LEDs instead of integrated LED arrays? Just so your array would fill the real estate you laid out for your drivers to make your board tidy? It could have been about 40% of this surface area. BTW... an ever-so-simple 555 timer can be used for the horizontal sweep. The charge on its timing capacitor is easily linear enough for a purpose like this, and you have all sorts of control over its sweep frequency, especially if you use a CMOS version of the timer.
The lack of a standardized LED array was one reason for using individual LEDs. The main board itself is something I call a "half-project" where students assemble the components on the pre-etched PCB and then they add their own vertical and horizontal driving sections. As such, I wanted a "motherboard" design that would not have to be re-done every time my favorite LED array became unavailable. Another reason for individual LEDs is simply to give students LOTS of soldering practice!!
@@lcstate_eet7381 I'll certainly grant the lots of soldering practice! 8) ...and desoldering, when three of the LEDs get installed backwards... 8) That's hair-raising in the middle of an array, where it's so difficult to tell which pin you're heating up. I'd almost be tempted to suggest wire-wrap. Oh, but wait - they could test each row of LEDs as they solder them down, couldn't they? That'd help a lot.
