Orange Squeezer bias?

[Bernardduur]

OK, I was wondering;

I've build an Orange Squeezer and really like it for my bass; it is not that big, a bit transparant sounding BUT adds some "mojo" to my sound, something I like.

My question; does anyone knows how the originals were biased? I've seen some pics of the inside of one and was just wondering how "they" were set up or biased.........

[Mark Hammer]

The biasing should produce an audible attenuation effect.

Keep in mind that:

1) The FET and 82k resistor form a virtual voltage divider or input-level pot before the op-amp.  Th 82k resistor has tolerances, and so does the FET and any associated components.

2) The "drive" to the FET's gate from the op-amp will be contingent on the tolerances of the gain-determining components  around the op-amp and rectifier components.

That doesn't mean that it would only be set up by ear, but it also doesn't mean that it could be set up optimally only by targetting certain voltages in certain places in the absence of signal.  What will matter is how much input level reduction at the FET/82k junction (the "wiper" of the virtual pot) is produced by how much input signal level change.  Somewhere, I imagine, are notes for what to feed in and how much drain/source resistance change one should aim for with X amount of signal amplitude increase, but I don't personally know what they are.

[Bernardduur]

OK, thanks!

Just curious