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Vintage threads from the first ten years
verify Ross Compressor schematic?
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 3/25/2000 9:08 PM |
|
Cole |
verify Ross Compressor schematic? Anyone here have a correct & verified schem of the Ross Compressor? The one someone sent me is supposedly built & verified, but it looks just like a Dynacomp with the following exceptions: 1) no diodes in circuit at all 2) the transistor around the sensitivity control replaced with 2N5485 FET 3) 25k trimmer instead of 2k trimmer 4) no input transistor, input signal goes directly to - (pin 2) input of 3080 5) all the .01u caps are .1u 6) the 150k resistors are 180k It doesn't look like the circuit works to me, but I haven't breadboarded it yet. Can anyone debunk this or what? |
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| 3/26/2000 8:22 AM |
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| paul perry |
That input straight to pin 2 of the 3080 OTA can't work, for a start. |
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| 3/27/2000 3:44 PM |
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| Cole |
""That input straight to pin 2 of the 3080 OTA can't work, for a start."" That's what I thought as well, you'd need an RC combination to the bias voltage at least, right? I think I'll run a circuit sim and see what happens. |
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| 3/28/2000 11:34 AM |
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| paul perry |
That isn't an ordinary op amp you have there, it is an 'operational transconductance amplifier' and the usual input to them is tens of millivolts, delivered by a potential divider normally. The input cap might not be essential, but certainly would be advisable. |
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| 3/28/2000 5:02 PM |
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| anonymous | I opened up mine last night and your information is all wrong. I saw two diodes (the would be needed to get a rectified signal for the level detector) and a 2k trimmer for starters. I've been meaning to draw this out for months now but as it resides on my pedal board, in the trailer, near the back, I never seem to remeber to grab it after a gig at 3:00 am. I'll try and get to it this week. |
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