[sdiy] LM3914/Voltage Controlled Electro-Optical Mixer Question

[Michael Ruberto]

the inputs are supposed to be able to sink 30ma or so the datasheet says. 
however during my experiments I found that the chip started to run hot with 
15ma on the inputs. maybe it's a typo because elsewhere it reads that the 
max is 12ma. try using those 2ma LEDs and you should be ok.

Mike


>From: "Fahl, Romeo" <RFahl at extensis.com>
>To: synth-diy at dropmix.xs4all.nl
>Subject: [sdiy] LM3914/Voltage Controlled Electro-Optical Mixer Question
>Date: Mon, 14 Jul 2003 11:24:53 -0700
>
>I'm planning on building a pair of Grant Richter's Voltage Controlled
>Electro Optical mixers soon.  Before I lay out the front panel, I'd like to
>know the following:
>
>I'd like to add an LED to each input to indicate which input is active.  
>Can
>the the 3914s outputs drive an extra LED in series with the Vactrol LED to
>accomplish this?
>
>The original schematic is located here:
>
>http://www.musicsynthesizer.com/Corpse/VCEOM.html
>
>Thanks, y'all!
>
>Romeo

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