imo
Well-known member
Does anyone have this floating around? I can definitely run a bunch in series or parallel, but this incororated a transistor and cap, and was a bit more elegant
Thanks
Ian
Thanks
Ian
led meter light circuit?
- Thread starter imo
- Start date
Help Support GroupDIY Audio Forum:
Here is one:
A 10 step meter
http://sound.westhost.com/project60.htm
LM3915 based, 3db per step, but you can change it using different chips (LM3916 is VU steps, LM3914 is linear). There is a similar (same?) circuit in the datasheet for the IC's. You can make more steps by consulting the data sheets for any of those IC's (up to 20 steps).
But to get "regulation" VU dynamics, you will need to do a little research, and might find that you can't get agreement among sources on the dynamics. Furthermore, you may find that for digitally encoded recording a VU meter is not really what you want.
If you just want a "peak" light, you can make it with this.
Go to this link and search within the page for Peak Detector
http://sound.westhost.com/project30a.htm
It takes 2 op-amps to make it symmetrical (deal with positive and negative overs in the wave). So you can make two indicators (signal and over) with a quad op-amp.
Note:
On re-reading your post, it occurs to me that you are trying to light the face of an analog meter?
A 10 step meter
http://sound.westhost.com/project60.htm
LM3915 based, 3db per step, but you can change it using different chips (LM3916 is VU steps, LM3914 is linear). There is a similar (same?) circuit in the datasheet for the IC's. You can make more steps by consulting the data sheets for any of those IC's (up to 20 steps).
But to get "regulation" VU dynamics, you will need to do a little research, and might find that you can't get agreement among sources on the dynamics. Furthermore, you may find that for digitally encoded recording a VU meter is not really what you want.
If you just want a "peak" light, you can make it with this.
Go to this link and search within the page for Peak Detector
http://sound.westhost.com/project30a.htm
It takes 2 op-amps to make it symmetrical (deal with positive and negative overs in the wave). So you can make two indicators (signal and over) with a quad op-amp.
Note:
On re-reading your post, it occurs to me that you are trying to light the face of an analog meter?
gemini86
Well-known member
Kindof thought that as well.
imo
Well-known member
yes, that is a nice meter circuit. I was trying to find the schematic for a meter light circuit that was a little better than just stringing a bunch of led's up with a dropping resistor. I had one at one point that incorporated a transistor, but seem to have misplaced it.
Thanks for the info though
Ian
Thanks for the info though
Ian
Well the LM3915 does contain transistors <grin>
Anyway, are you saying that you want a circuit that does not contain the LM3915?
There are discrete circuits, and there are ones that contain various comparators (ex LM339)
bb
Anyway, are you saying that you want a circuit that does not contain the LM3915?
There are discrete circuits, and there are ones that contain various comparators (ex LM339)
bb
gemini86
Well-known member
We want a circuit for LED lighting of an electro-mechanical meter. (bouncey needle)
Not sure what circuit you're speaking of, but in most cases, a dropping resistor is just fine, when you have the PSU headroom to spare (which I'm sure you do).
Not sure what circuit you're speaking of, but in most cases, a dropping resistor is just fine, when you have the PSU headroom to spare (which I'm sure you do).
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