Fwd: Re: [sdiy] VCA controls

[Tim Ressel]

--- Don Tillman <don at till.com> wrote:
> Use the LM3914 but put the LEDs in *series*, drive
> the top of the LED
> string from a constant current source, and
> optionally add a zener
> diode to keep the current constant for the case when
> all the LEDs are
> off.

I'm wondering why that is nessessary. The lm391x has
internal programmable current drivers. Is the CC
source to keep the noise out of the power supply?

--TR

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