I am looking for a very simple mono vu meter with 1 row of at least 20 LEDs. I am using a LM3915 and this simple diagram:
http://www.circuitsonline.net/schakelingen/59/audio/led-vu-meter.html
It works great with a headphone input, but I added a second and I can't get them to work together. It is driving me crazy! Any way I wire it they both work independently. Some tutorials say you can link pin 4 on the first chip to pin 6 on the next, but that doesn't work. Please email me if anyone has a simple solution to this problem or a different route completely.
Thanks
http://www.circuitsonline.net/schakelingen/59/audio/led-vu-meter.html
It works great with a headphone input, but I added a second and I can't get them to work together. It is driving me crazy! Any way I wire it they both work independently. Some tutorials say you can link pin 4 on the first chip to pin 6 on the next, but that doesn't work. Please email me if anyone has a simple solution to this problem or a different route completely.
Thanks