Sunday, 16 April 2017

Way Huge Saffron Squeeze MKI

A modified Ross Compressor. Two simple controls sustain and level. Unfortunately, I haven't been able to find a video for the MKI, but as we all know if it's been modified by Mr. Huge it's going to sound great.




Note: There's a cut under D3 to the left of the 1nF cap that's hard to see.

17 comments:

  1. Glad to see this. Can't believe I just started a Ross compressor build a couple of days ago. My timing is off.....

    Thanks for the layout

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    1. anytime, and it happens sometimes. Hoping someone will have some shots of the MKII cause there's 3 additional controls. I'm pretty certain about 2 of them, but need to confirm before I finalize the layout.

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  2. I think the input cap is supposed to be 22nf, not 220nf.

    I don't see how it could sound much different from a standard Ross compressor (except for the 100pf to ground at the input, which will brighten the sound. Keeley puts a 150pf there)

    Thanks for the layout though!! :)

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    1. yea, it was a type-o, fixed it and update the layout. i've actually be able to play a ross compressor against this a few years ago and the few component changes do actually make a fairly noticeable difference. as you may come to notice when looking at a lot of pedal circuits many of them share the same topography with a few component changes, which can transform a pedal in a rather noticeable way.

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  3. Sweet! If you ever get the mkii version figured out, could you add a blend control (with any necessary phase correction)? Thanks for putting this up!

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    1. i don't see why not. the blend would need to be in phase the compressor to work right.

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    2. Nope. The input and output are out of phase with each other due to how the OTA is used (as an inverting amplifier). Due to this, simple(st) blend methods won't work. To get it working right, one needs to blend the input signal with inverted output. There is quite simple method to do this, described here: http://www.diystompboxes.com/smfforum/index.php?topic=40292.0
      I used this to create my 5-knob Keeley mod Ross posted here:
      http://tagboardeffects.blogspot.fi/2016/01/5-knob-compressor.html

      I'd be interested to see an optical design with added blend.
      +m

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    3. I swore I've seen people in the DIY community use a blend on a Ross style compressor. But, I guess I was wrong.

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    4. That's what i was saying. But to simple reverse the phase on basic blend circuit won't do it. Tried that for myself back in the day.
      +m

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    5. Ah. I miss understood. Glad to see it actually is possible, even if it's not with a simple blend circuit.

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  4. Is it too bad if i just use a CA3080 instead of a CA3080E?

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  5. Just finished this, and I would like to ask a question - how should I go about setting the trimpot?
    As far as I can tell, it works, but I haven't used any compressor before so going into testing a little blind. At higher settings (both controls), apart from a significant volume increase, there is a degree of overdrive to the sound - is this to be expected?

    Again, many thanks for your efforts in uploading schematics,

    Adam

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    1. hey man. it's the same as in the ross compressor. i found how to set it in the ross, which sets the balance between the positive and negative inputs to the CA3080.

      ADJUSTING THE TRIMPOT:
      Once you have completed your build, you will need to adjust the trimpot before the compressor will actually work. There is no specific voltage that you should try to set it for. Simply use your ears! You are setting it so that the compressor has the least amount of distortion. Start by setting the knobs as follows:
      1. Sustain -full turn clockwise
      2. Tone -full turn counter clockwise
      3. Ratio -full turn clockwise
      4. Attack -noon
      5. Level -to taste

      Plug into your guitar and amp. Make sure you have power to the pedal and the LED comes on. Strum a good hard chord. Slowly turn the trimpot till you find the setting that gives you the cleanest sound. It will usually be right at noon. If you have an 18VDC power supply, this is even better for setting the trimpot even if you don't plan on using an 18VDC power supply when you actually use the pedal. This because 18VDC will make the trimpot more sensitive and you will find the best setting more easily.

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    2. quick note, there's only a sustain and level. so i would only worry about those controls in the directions above.

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  6. Zach - thanks for the advice. Done as you suggested and think the pedal works fine. Havent had a chance to let rip with my amp yet though. It does colour the sound to some extent, but i quite like it.
    Cheers,
    Adam

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    1. the normal compressor does color your sound a bit. so cheers on the verification.

      there's actually external controls for the the tone, gain, and highs in the MKII 2. unfortunately, i don't know what the values are to change the layout for the MKII. I have an inclination that the tone and attack are damn near the same as the BYOC 5 knob compressor, but no idea about the gain. if someone grabs one we can see the changes and i'll have modify the layout so we can have both.

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