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Compressor schematics on line.


 
3/5/1999 8:42 PM
R.G.
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Compressor schematics on line.
The schematics for the Orange Squeezer and Dyna-comp compressors are on line at GEO in the vintage schematics section.
 
3/6/1999 9:41 PM
erin
those JFETs look familiar, PLEASE dont tell me they have to be matched!
 
 
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3/7/1999 9:13 AM
R.G.
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I don't think so. It looks to me like one is used for a constant current source, the other to modulate the circuit gain. I'll know more when I get the PCB prototyped and built.
 
3/7/1999 9:14 AM
R.G.
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Forgot to ask - how is the matching for the phaser going?
 
3/7/1999 1:54 PM
erin
Good, ive still only got the first 10 and found that 6 are within 10% and it sounds good with those.
 
3/8/1999 6:57 AM
CJ Landry
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RG,  
Can you explain how the Orange Squeezer works. Particularly, the feedback loop that drives the FETs. It looks like the peaks of the output of the op amp drive the first FETs gate but what throws me off, is the input signal is also seen at the gate of the first FET through the 2200pf and 470k R divider.  
I am stumped on what this section does?  
 
Thanks,  
CJ Landry
 
3/8/1999 8:34 AM
R.G.
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The JFET with its drain tied to +9V acts as a current source to establish a voltage through the 2.4K resistor and the 10K variable bias pot. This sets the source of the signal JFET at a fixed DC voltage. The signal JFET is simply acting as a variable resistor, which divides down the input signal as it comes through the 82K resistor at the input.  
 
The 2200pF/470K resistor from drain to gate on the signal JFET and the 470K resistor in series with the gate from the feedback voltage is a linearizing feedback setup around the JFET, and makes it a much more linear (less distortion on bigger signals)if less sensitive voltage variable resistor.
 
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