Had anyone built CA Envelope Follower?

[gigimarga]

Hello,

I found in EPFM a schematic of an envelope follower which i want very much to build to control a MXR Distortion+ (or something like...) by the dynamic of my picking.

But i don't know where to find CLM 6000, it seems to me to be too old.
Can it be replaced with a more modern optocuplour, which i can find?

Do you know another schematic (a stand alone envelope follower) which can made the same thing?

Thx a lot!

[Mark Hammer]

You can get them at Small Bear.  A Silonex NSL-32 is often considered a suitable sub for a CLM-6000 if you can't find the Clairex unit.

[gigimarga]

thx for your answer...it's hard for me to buy from smallbear...here i can find mainly these optocouplers:
http://www.conexelectronic.ro/content/category/catID_66/Optocuploare/-/optotriace.html?catID=66&pageID=0&orderBy=sortOrder_asc&setRPP=100000  or some LTV, CNY...is there anyone good?

do you know another schematic like this?

[Mark Hammer]

Maybe you need to tell us how you plan to use the LDR.  That will tell us:

a) what resistance characteristics it will need, and
b) what kind of response (fast/slow) it will need.

Many of the optocouplers on the page you link to are phototransistors, not LED/LDR combinations.

[gigimarga]

Mainly i want to use it to control the amount of distortion in a MXR Distortion+ (the 500K reversed log pot) or in a similar distortion (maybe a Big Muff Pi or a Sonic Distortion) and i want a fast response from it.

I never use a optocoupler, so i made a big mistake...sorry...i will search another site from here.

Thx a lot!

[Mark Hammer]

There is fast and there is fast.  If it takes 10 milliseconds for the LDR to change resistance, that may be good for a filter or changing the distortion, but not fast enough for a noise gate or compressor.

[gigimarga]

I want to change the distortion, so 10 ms sounds ok...i want to play some hard rock/blues...the tempo it's enough slow

[gigimarga]

 

[Mark Hammer]

Just get any suitable LDR/photocell and LED and we'll take it from there.  You can always design the rest of the circuit around the resistance characteristics of the LDR.

[gigimarga]

Ok...thx a lot...i will post a message as soon as i will find one