Has anyone used the NSL32 optoisolators for a neutron (Mutron III clone). Even though it is mentioned in Geofex neutron article, I've checked the specs and it seems to have an OFF resistance of 500K, that is a lot less from the 10M of the VTL5C3 (which I know from another member of the forum that works).

In case it does not work, would it be possible to make it work by increasing the value of the 220k resistor in parallel with the LDR?

I  think  that  difference  in  OFF  resistances  between
VTL5C3  and  NSL32  is  not  important  because  maximum
resistance  is  limited  with  220k resistors.
As  far  as  I  remember  resistance  in  Mutron  clones  should  
vary  somewhere between  few  kohms  and  100kohm.

I  use  NSL-32  in  DOD  280
compressor  and  it  works  perfectly.
This  weekend  NSL's  will  go  into the  heart  of
Meatball  clone ;-)

I mentioned Neutron because I guessed that there is more people who have done Neutrons instead of Meatballs and they seem to be very much alike... It is really going to be used for the Meatball  :wink: , so we will share experiences with the NSL32.

Thanks for your help... Hope everything works as expected!!!

Did you build it Nick123? I built it and I suppose it needs different values for R10 and R11, because it is only playable with the intensity pot set to minimum and the trigger set to UP. I'll do some tests today.

I  didn't  have  time  to  finish  it :-(
In  my  DOD  280  compressor  clone  
I  have  noticed  that  there  was  a  difference  
in  response  between  NSL-32  and  VTL5C3.
I  would  try  the   100ohm  + 1klin  combination.

I might try this evening. I'll let you know how I get along.