I was recently looking over A thread about orange squeezer dist..Im having the same problm and believe i can do the same as Saxim did. It was said that u should ground 1/2 the op amp- pins 5-6-7.. It looks as though pins 3 and 4 allready go to ground..Im using the GGG layout and rts pcb.
Simple question..Does this mean solder these pins( 5,6,7) togather and than to than solder to the ground?
I didn't use the GGG layout, I used my own. The orange squeezer uses only half of the 4558 (which is a dual opamp) Looking at the layout there, they used the other half of the opamp (pins 5, 6 and 7) than I did (I used pins 1 2 and 3). The inactive part of the opamp on that layout is pins 1,2 and 3. That layout alread has pin 3 tied to ground and pins 1 and 2 tied together making the unity gain follower that I had to set up. Are you experiencing distortion? There may be some other problem. I found that there was really only a small amount of area on the trimpot that I could get a useable signal out of that wasn't distorted. This happened to be up around the highest compression level though, which suited me. What symptoms do you have?
Btw, the answer I give above is pieced together with my limited electronics knowledge- you might want someone with more experience to confirm what I've said.
tim
Im very limited as well..What else did you try in terms of knocking out some dist that actually made a difference..Did u change the values of output caps ect..that made a diff. Or was it mostly the trimmer knocked back that made any real diff?
Thanks.
jim
Couldn't you use a TL071 (single opamp) or equivalent for the squeezer? It seems a waste to have a dual opamp sitting there with one half doing nothing.... :)
Look at the mods for the OS that JD posted on GGG. I whipped up one that uses the other half of a dual op-amp as a tone/gain recovery stage and I was very pleased with the result. Allows you to use a gain control on the first stage to reduce compression without having to sacrifice overall level.