Which are the differences between Demeter Compulator and Demeter Compulator Pro?

[gigimarga]

Hello!

Sometime ago I've built a clone of Demeter Compulator COMP-1 (http://www.demeteramps.com/products/pedals/comp1.html) using this schematic: http://i197.photobucket.com/albums/aa211/bajaman002/compulatorschematic.png. It sounds very well and I like it a lot (thx bajaman for this great project!).

After sometime I discovered that it's a professional version, too: http://www.demeteramps.com/products/pedals/compro1.html.

I am curious is somebody knows the differences between these two version, or, to be more clearly, I want to know how to add the "Attack" and "Release" pots to a "normal" Compulator.

Thx a lot all!

[gigimarga]

 

[gigimarga]

It seems to me that others optical compressor have only "Sensitivity" and "Volume" pots, too.
This thing means that the DC Pro is much complicated than the regular version?

[Tonemonger]

I'm always looking for simple compressors so first of all -Thanks !
I need to grab a couple of things before I can breadboard this But, have You tried altering anything in the network on the bottom right hand corner like the 4k7 ?
I'm only guessing ofcourse But, maybe feedback delay could form the release control ?

[ryanuk]

I am curious is somebody knows the differences between these two version...

I dont there will be a dramatic different between the schem of the original compulator (drawn by Bajaman) and the pro box. The gain switch on the pro replaces the fucntionality of the "gain" trim pot. As for the attack/release controls, these pots will have simply replaced resistors in the circuit so they can be varied.

.....or, to be more clearly, I want to know how to add the "Attack" and "Release" pots to a "normal" Compulator.

Thats the $64,000,0000,0000,000 question.

Bajaman, you out there? Any suggestions?

RyUK

[CLAAS]

FSB???

[gigimarga]

FSB???

I did it

[gigimarga]

 

[PRR]

> how to add the "Attack" and "Release" pots to a "normal" Compulator.

The attack/release in this class of limiter is *set* by the photocell. There are no other time constants, only the photo-chemical reactions of the photo-resistor.

This CAN be very effective. The LA2-a is an old radio limiter now widely used and well-loved as a studio limiter. And it has no attack/release control except selection and luck with the photoresistor.

To do attack/release "right" adds more parts than it already has. Add sidechain rectifier, A/R filter, Photo-R linearizer/buffer.

You totally lose the simple elegance, start drowning in parts. Now the slow photo-R fights you, becomes a nasty problem instead of a simple answer. It really makes sense to move on to a JFET limiter. You still need rectifier and filter, but don't have to buffer.

[gigimarga]

Thx a lot PRR! You're great as usually!
From now on I will stay calm about this problem...

[Jarno]

A problem? It's an opportunity, buy one and reverse engineer it! 

[gigimarga]

A problem? It's an opportunity, buy one and reverse engineer it! 

I hope to have somewhere in time so much money