Voltage levels and VU meters...

[Antti Huovilainen]

On Tue, 27 Jul 1999, Chris Crosskey wrote:

> If it needs DC then what do I do, if I rectify it with signal diodes, how do
> I go about smoothing it when the signal might be anywhere between 20Hz and
> 20kHz?....I know that I'm unlikely to need the bottom octave of that or the
> top two but I want it to be capable of the full range....

You might want to use active rectifier to get rid of the 0.6V diode drop.
For smoothing, make an RC lowpass filter with cutoff set low enough (say, 
20Hz). 
Disclaimer: I don't have any experience using VU meters so this advice
might be wrong.

Antti

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