PLAN B analog blog

I just Direct Coupled my Lo- Pass gate. Any reason not to do this... seems like a cool thing 
'cause I can use it for processing control voltages as well now.

Tony

There's nothing wrong with shorting out the caps to direct couple the
gate.  Make sure though it's right ones.  There are two .47 caps on
each gate.  The one you want to kill is the one closest to the
faceplate, not the one next to the transistor.  There is as well a
10uf electroytic in the vicinity of the vactrol which may have to be
shorted as well.  Be aware of two things however:

A) The 10uf serves as a offset filter.  Without it the gate may give
you an audible 'bump' when it opens and closes. That's the unleveled
DC offset that the 10 muff killed.  

B) Keep in mind that the vactrols are real slow (a good thing for
audio), but it causes a built-in slew when gating DC (may be a bad thing).

There are ways of improving this but at the cost of compromising
possibly the reason you got the M13 in the first place - the ringing.

Looking on the board you'll see basically two repeated halves with a
strip of stuff thrown in the middle which doesn't repeat.  That center
section is the crossfader circuitry which you need not concern
yourself with. But on the two sections that repeat (obviously one
being the top gate and the other one being the....anyone? anyone?) 
you will find a 470K resistor (yellow purple yellow bands).  Lowering
that value will cut the slew down...and the ringing effect with it. 
You can go all the way to putting a jumper in there for zero
resistance.  That's the greatest amount of change you can inflict,
anything between that and 470K being your playing field for
experimentation.

You won't get rid of the slewing, but it will cut it back.

For slow attack/decay type usage you'll probably not notice it's even
there.  For the fast stuff however it'll do what any other slew
limiter would. 

File under OMG OMG OMG: 

One of my customers mailed me Britney's new CD for my birthday based
on the comment I made here (LMAO!). THAT was a riot. After the first
and quite possibly last listening I can say with all
confidence....that it does not fit in my musical aesthetics in any
way, shape or form. A matter of fact, there is no form.  I think I now
understand the basis in which people are making allegations about her
 mental stability. 

Great use of photoshop and TC Helicon (that being a pitch corrector).

I would thank this individual publicly for this kind gesture, but the
CD was already opened when I got it, my thinking he purchased it for
himself and I don't want to cause him unnecessary ridicule (!). 

So thanks...you-know-who-you-are.  Taken in the spirit in which it was
sent and got a huge bellow of laughter here at PB ops!  

- P

 




--- In PLAN_B_analog_blog@yahoogroups.com, "goldenechos"
<goldenechos@...> wrote:
>
> I just Direct Coupled my Lo- Pass gate. Any reason not to do this...
seems like a cool thing 

> 'cause I can use it for processing control voltages as well now.
> 
> Tony
>