LED Matrix Oscilloscope Test

Finally got me some LM3916 ICs and re-built my circuit from previous videos.

LM3916 replaced the LM3915, producing a wider range of dynamic visuals. I also made the test display wider by putting two 5x7 modules side by side and wiring accordingly.

2 problems:
it's either clearly visible wave visuals with obvious scanning action, or smooth un-detectable scanning action without clear wave action (it just appears as a solid line moving up and down.

LEDs appear quite dim.

crappy sketch of the schematic can be found here:
http://afrotechmods.com/forums/index.php/topic,8335.msg138902.html#msg138902

has anybody pulled this off with better results using a similar circuit design? I'm interested in "dazzling" visuals more than accuracy at this point.

any help/suggestions/comments/criticism welcome!

Category:

Science & Technology

Tags:

• led
• matrix
• oscilloscope
• lm3916
• 4017
• 555
• IC
• timer
• decade
• decoder
• vu
• meter