I have a Drawmer 1968 Mercenary compressor. It has 3 program dependent release settings.
2 are described as semi-auto (200ms - 2sec and 500msec - 5).
The 3rd is described as automatic (1sec - 10sec).
I am curious how these circuits actually work.
I assume this is all done in the analog domain so what criteria are used to achieve
these automatic release modes?
I have a Drawmer 1968 Mercenary compressor. It has 3 program dependent rele= >ase settings. 2 are described as semi-auto (200ms - 2sec and 500msec - 5). = >The 3rd is described as automatic (1sec - 10sec).=20
I am curious how these circuits actually work. I assume this is all done in=
the analog domain so what criteria are used to achieve these automatic rel=
ease modes? I typically use this unit in linked mode with bass and bass dir= >ect signals and found 200ms - 2sec semi-auto mode works best.
Gary Vee <gar...@gmail.com> wrote:
I have a Drawmer 1968 Mercenary compressor. It has 3 program dependent rele=
ase settings. 2 are described as semi-auto (200ms - 2sec and 500msec - 5). =
The 3rd is described as automatic (1sec - 10sec).=20
I am curious how these circuits actually work. I assume this is all done in=Calling this "automatic" is silly.
the analog domain so what criteria are used to achieve these automatic rel=
ease modes? I typically use this unit in linked mode with bass and bass dir= >ect signals and found 200ms - 2sec semi-auto mode works best.
What is going on is that your signal comes in, and it goes into some kind
of envelope detector which produces a voltage that is proportional to the peak value or the RMS value or something in-between. That is your control voltage. After filtering, that is used to control the VCA.
Now, that controls signal gets filtered, and there is a low-pass network
and that switch is setting the time constant of the low-pass network.
The capacitor in that low-pass network (and we'll think of it just as a single RC filter with one pole for the purposes of making the explanation simpler) fills up at a rate proportional to the envelope of the signal and discharges at a constant rate set by a load resistor.
A small peak goes by.... a small control voltage fills the capacitor up
a little bit and it discharges down quickly.
A large peak goes by... a large control voltage fills the capacitor up a whole lot and so it takes longer to discharge.
Download and read the manual for the Orban 424, it explains the circuit design nicely.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
On Saturday, August 7, 2021 at 9:59:47 AM UTC-7, Scott Dorsey wrote:
Gary Vee <gar...@gmail.com> wrote:
I have a Drawmer 1968 Mercenary compressor. It has 3 program dependent rele=
ase settings. 2 are described as semi-auto (200ms - 2sec and 500msec - 5). =
The 3rd is described as automatic (1sec - 10sec).=20
I am curious how these circuits actually work. I assume this is all done in=
the analog domain so what criteria are used to achieve these automatic rel= >>> ease modes? I typically use this unit in linked mode with bass and bass dir=
ect signals and found 200ms - 2sec semi-auto mode works best.
Calling this "automatic" is silly.
What is going on is that your signal comes in, and it goes into some kind
of envelope detector which produces a voltage that is proportional to the
peak value or the RMS value or something in-between. That is your control
voltage. After filtering, that is used to control the VCA.
Now, that controls signal gets filtered, and there is a low-pass network
and that switch is setting the time constant of the low-pass network.
The capacitor in that low-pass network (and we'll think of it just as a
single RC filter with one pole for the purposes of making the explanation
simpler) fills up at a rate proportional to the envelope of the signal and >> discharges at a constant rate set by a load resistor.
A small peak goes by.... a small control voltage fills the capacitor up
a little bit and it discharges down quickly.
A large peak goes by... a large control voltage fills the capacitor up a
whole lot and so it takes longer to discharge.
Download and read the manual for the Orban 424, it explains the circuit
design nicely.
Thank you for the excellent reply Scott.
I have not been too keen on the fully automatic setting.
To my ears both the semi-auto settings are much better.
Looks like the only
difference between your 3 settings is the time constant, and the 3rd one
is probably too long for your usage, that's all.
Sysop: | Keyop |
---|---|
Location: | Huddersfield, West Yorkshire, UK |
Users: | 295 |
Nodes: | 16 (2 / 14) |
Uptime: | 20:51:47 |
Calls: | 6,640 |
Files: | 12,188 |
Messages: | 5,325,292 |