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Author Topic: Guide: Stereo VU Meter  (Read 29904 times)

djpenguin

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Guide: Stereo VU Meter
« Reply #20 on: August 05, 2003, 02:54:27 AM »

One more quick question.  How many amps/watts does each of these circuits draw?
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jingoku

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Guide: Stereo VU Meter
« Reply #21 on: August 06, 2003, 08:27:05 AM »

Hum...good questions, let see, if each LED draws about 10 mA and they are wired in parallel, so 10 x 10mA = 100 mA, now we have to add the current draw of the IC, I'm going to give a wild guess that it is another 100 mA... now I dont want to start drawing circuits with current going left and right, and just give you a wild estimate... my guess is this circuit draws around 500 mA. I think that's what my variable power supply's needle was around. Watts??? Hum... let see another wild guess... P=VI= 12Volts*500 mA = 6W ... someone correct me if I'm wrong..I'm just to lazy to start pulling out calculators and schematics to draw current draw and power dissipated...eesh...

Ok, I did work out the schematics for the 90 db circuit...I have yet to work that of the dual stereo... I'm just trying to enjoy a bit of summer and being as lazy as I can ...  :D
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i am a nerd

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Guide: Stereo VU Meter
« Reply #22 on: August 06, 2003, 09:08:39 AM »

i heard gideonx is a beast in bed...?
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LordThanatos

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Guide: Stereo VU Meter
« Reply #23 on: August 06, 2003, 09:09:59 AM »

Quote from: i am a nerd
i heard gideonx is a beast in bed...?

It's only a rumor, and we all know rumors are never true
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Skylined

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Guide: Stereo VU Meter
« Reply #24 on: August 06, 2003, 11:23:31 AM »

jingoku: is the schematic and parts the same for a LM3915 and a LM3916?
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derb

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left and right
« Reply #25 on: August 06, 2003, 06:15:53 PM »

on the diagram it shows to connect positive and negative for the signal input. if you wanted one that did left and one that did right, wouldnt you just hook the left signal to positive and ground to negative and vice versa for the right side?? im a total noob when it comes to circuitry, i know how to make em, but no clue how sh*t works. so am i correct or horribly wrong. if im wrong how do you do one for left and one for right??
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jingoku

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Guide: Stereo VU Meter
« Reply #26 on: August 07, 2003, 07:04:37 AM »

Hello, the schematics are the same for both 3915 and 3916

Derb: to make it stereo you need two LM 3916 I was being lazy and didn't draw the schematics for that yet... :) I will do it right now.

Basically connect the ground of the stereo plug to both LM3916, and then connect the left onto one 3916, and the right to the other 3916.
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jingoku

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derb

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Guide: Stereo VU Meter
« Reply #28 on: August 07, 2003, 08:28:40 PM »

sweet thanks jingoku that cleared it all up for me. im off to the shops now :D
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djpenguin

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Guide: Stereo VU Meter
« Reply #29 on: August 08, 2003, 05:49:36 PM »

So the 90dB design uses 30 LEDs?  Is there a way to build it with just 10?  

Thirty LEDs per channel x 16 channels x 45 cents per LED = way too much money ($216)
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