NSL32 vs H11F3 in Neutron

[juancra]

Hi all!

I'm about to start a Neutron Clone and a question came to me when I was buying parts. I Have both the possibility of placing either NSL32 LED/LDR or H11F3 photo-fet. I can't decide which one is better , 'cause i've read that octocouplers vary a lot from one to another (I'm getting different off-resistance measures in the two I have ) while I saw some people saying that photo-fet adds distortion to the signal as it reacts way too fast. Which one would you reccomend?

[chicago_mike]

Im going to try the vactrol 5c3's. I was able to get them off ebay. Once done Ill let you know my findings.

[Mark Hammer]

Use the optoisolator.  PhotoFets have too quick a response time, which can result in audible envelope ripple during the decay/sustain portion of a note.

[juancra]

Yes I think I will follow the optoisolator path. Rather than using NSL32 I will build an vactrol-o-mine using a LED and a CDST121 LDR, which are more consistent between them and are more close to CLM's specs, thanks a lot mark!