[sdiy] Mute solution?

Mattias Rickardsson mr at analogue.org
Sat May 26 21:47:48 CEST 2018


On 26 May 2018 at 19:51, Roman <modular at go2.pl> wrote:

>
> And yet another idea to make it faster for higher frequencies and slower
> at the low end - make two such mute citrcuits pulling down one signal line
> - one FET gets the signal on its drain via capacitor, and its muting RC
> time constant is short, so high frequrncies are muted quickly, while low
> end doesn't care about that little cap and carries on. Then second FET hits
> in, with longer time constant RC. Without any cap it clamps everything to
> GND.
>

True, what you really would need is a sweeping filter that opens/closes the
high frequencies quicker than the lows. This means that turning the signal
"on" is like sweeping a HPF from high frequencies and down, whereas turning
the signal "off" is like sweeping a LPF from high frequencies and down.
Makes for a great electronics exercise! ;-)

But - for optimum timing of all frequencies it's not an ordinary filter
sweep where the cutoff frequency is moving, but a filter that gradually
alters its slope. :-S

/mr
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