It looks pretty much okay at first glance, but the resistor in the power line is unnecessary. 12V supply is fine. Your power switch is drawn a little oddly, but the overall idea of switching the supply is okay.
You have the resistor in line with the voltage supply to the IC as well. The driver IC already limits current to the LEDs, so yeah, yank that resistor out. See, it just keeps getting simpler. Did you read the datasheet at all?
i dun understand datasheets so i just need to yank the 680ohm resistor @ the bottom out? which means there's only a resistor to limit the current for the pwr led?
They won't, that's one of the nice features of that IC, it is a current-limited LED driver. *And* if youwant to limit the current even more, there's a pin for that purpose. Don't do it the way you drew.
You can't use that many LEDs. The current limiting set by the two external resistors (the same two resistors that control the voltage at which each output will light up) on the chip will only allow enough for one LED per output (possibly two).
did a search on the net (google ) and found some curcuits: I find the first one good, but I need to add in a VR somewhere so that I can control the sensitivity of the curcuit. Could someone comment on these and mine? I wanna try my curcuit but i'm afriad it might not work.
They're all right off page 2 of the datasheet, with minor modifications in each case. They should all function. Including your latest.
Thanks. Having a hard time soldering these colse joints. Just received my samples from National yesterday and was soldering them yesterday. The joints were really close and I havent strained my eyes these much since unlocking my Athlon XP. Now i'll have a easy time solder those in series!
Just completed my soldering and stuffs for this VU meter and i'm stunned.... cos it's working... gonna get a stereo audio splitter now so that I can use it wif my speakers.
