I made a el-opto type compressor from a kit, it compresses in a cool sustainy, punchy way, but it sounds like eggs are being scrambvled in the background when I push the fader up. would better quality caps help reduce the noise? what brand?
d




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In article , drewbass wrote:
I made a el-opto type compressor from a kit, it compresses in a cool sustainy, punchy way, but it sounds like eggs are being scrambvled in the background when I push the fader up. would better quality caps help reduce the noise? what brand?

Probably not. What are the active electronics like? If you disable the
opto completely, is it just as noisy?
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

I made a el-opto type compressor from a kit, it compresses in a cool
sustainy, punchy way, but it sounds like eggs are being scrambvled in the
background when I push the fader up. would better quality caps help reduce
the noise? what brand?

Probably not; unless they're grossly defective, caps don't generate serious
noise problems. Look at the active devices, the optocoupler, and resistances in
the circuit.

Peace,
Paul

Pooh Bear wrote:

drewbass wrote:

I made a el-opto type compressor from a kit, it compresses in a cool sustainy, punchy way, but it sounds like eggs are being scrambvled in the background when I push the fader up. would better quality caps help reduce the noise? what brand?

Very unlikely to be caps, what made you think so ?

What brand / model is the opto ?

I thought so because it was a guess, I don't know much.
It's a midwest analogue whisper compressor.
Thanks




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thanks paul





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Thanks Scott, I'll try that




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hi Graham,
the fader is the fader on my board,
Can any better opto from the site mentioned below work as a replacement without having to modify the existing circuit? can I snail mail you a schematic?
thanks, drew
It would be great if this worked better, and I learned how to make it better

Pooh Bear wrote:

drewbass wrote:

Pooh Bear wrote:

drewbass wrote:

I made a el-opto type compressor from a kit, it compresses in a cool sustainy, punchy way, but it sounds like eggs are being scrambvled in the background when I push the fader up. would better quality caps help reduce the noise? what brand?

Very unlikely to be caps, what made you think so ?

What brand / model is the opto ?

I thought so because it was a guess, I don't know much.
It's a midwest analogue whisper compressor.
Thanks

Ok - I found the site. It looks dead simple so it's hard to understand what might be the problem.

What signal level are you sending to it ? Which fader in the signal path are you pushing up when it makes the noise ?

The opto it uses it now discontinued btw, so can't get the datasheet. http://www.clairex.com/discontphotocond.pdf

Can you post the circuit somewhere ?

I'm suspecting the opto - One of these may simply drop in as a superior replacement.
http://www.silonex.com/audiohm/index.html


Graham






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drewbass wrote:

hi Graham,
the fader is the fader on my board,

Uhuh. Is it before or after the signal to the compressor though ?

And ! What signal level is going to the compressor ?

Can any better opto from the site mentioned below work as a replacement without having to modify the existing circuit?

You need to check the on resistance and led current. Basically yes though, although you might get better results by using one of the new lower resistance optos with suitable circuit mods.

One of the NSL-32 series looked like a candidate. I've used them in my own designs and know they work well.

can I snail mail you a schematic?

You can't scan it ? I'll email you a contact address.

Graham

Can you e-mail me contact info at ?
thanks,
drew
Pooh Bear wrote:

drewbass wrote:

hi Graham,
the fader is the fader on my board,

Uhuh. Is it before or after the signal to the compressor though ?

And ! What signal level is going to the compressor ?

Can any better opto from the site mentioned below work as a replacement without having to modify the existing circuit?

You need to check the on resistance and led current. Basically yes though, although you might get better results by using one of the new lower resistance optos with suitable circuit mods.

One of the NSL-32 series looked like a candidate. I've used them in my own designs and know they work well.

can I snail mail you a schematic?

You can't scan it ? I'll email you a contact address.

Graham






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