Recent Posts

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Build Reports / Re: The Deuce Drive
« Last post by blackhatboojum on Today at 07:53:47 PM »
Looks good to me.  Sometimes the simplest looking ones sound the best.  Either way, nicely done.
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Build Reports / Re: The Deuce Drive
« Last post by cooder on Today at 06:27:28 PM »
Sweet, nicely done!
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Build Reports / The Deuce Drive
« Last post by jimilee on Today at 03:12:55 PM »
My lack of creative names decided this will be the Deuce Drive. Itís an OS2 overdrive distortion.thing.  I think it sounds great. I donít think the graphics turned out fabulous, I sanded it down and did it again. I wasnít going to do a third time.







Sent from my iPhone using Tapatalk
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Open Discussion / Re: KiCad 3PDT schematic symbol.....?
« Last post by mixographer on Today at 01:09:06 PM »
Thanks for this. I'll take a look at it. I used the Sparkfun symbols with the three footprints and just deleted two footprints. Problem was the footprint is not for the same switches I keep in stock and the pins didn't quite fit. I think you're right I need to just draw a part that I will understand. Thanks for the help!

Jimmy

Edit: So to use this symbol, do you use three symbols and attach them to one footprint? With all 9 pins?
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Build Reports / Re: Jmk test rig V2
« Last post by dawson on Today at 12:55:41 PM »
..While a test rig may not have the sex appeal of a fuzz or delay..

I don'no man.. these images have got me feeling quite primal over here..

That layout looks like it'll be very comfortable to work with!
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Build Reports / Re: Aion FX Lab Series Preamp
« Last post by Drew Hallenbeck on Today at 05:33:22 AM »
Excellent knobbage!  Those from BLMS?

YUP!
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General Questions / Re: L5 Preamp Compressor Circuit Issue
« Last post by jfurgason on May 16, 2022, 02:07:09 PM »
Yep, I did the distortion calibration and was seeing the correct AC voltage pin 6 on IC10. I canít seem to get the compressor trim to get the right value, at its maximum and minimum ends Iím seeing between 0.244 and 0.29 VAC.  Iíve reflowed what I can reach, rewired everything,  and rechecked all resistor values and remeasured all chips and transistors. Power supply is still good, getting the proper +/-15V at the test points. Here are any readings not in spec with what voltage is expected per Aionís voltage doc.

All DC voltages
IC 4 (Iím using OPA2134 instead of 4558)
1 = 0V (should be -0.02V)
2 = 0
3 = 0
4 = -15.17
5 = 0
6 = 0
7 = 0.009
8 = 14.96

IC 5 (OPA2134)
1 = 0 (should be 0.01)
2 = 0 (should be 0.01)
3 = 0 (should be 0.01)
4 = -15.17
5 = 0 (should be 0.01)
6 = -0.9 (should be 0)
7 = 0
8 = 14.96

IC6 (OPA2134)
1 = 0 (should be -0.05)
2 = 0
3 = 0
4 = -15.17
5 = 0
6 = 0
7 = 0 (should be -0.06)
8 = 14.96

IC7 (OPA2134)
1 = 0 (should be -0.04)
2 = 0
3 = 0
4 = -15.17
5 = 0
6 = 0
7 = 0 (should be -0.05)
8 = 14.96

IC8 (OPA2134)
1 = 0 (should be -0.03)
2 = 0
3 = 0
4 = -15.17
5 = 0
6 = 0
7 = 0 (should be -0.02)
8 = 14.96

IC11 (CA3080)
1 = 0
2 = 0
3 = 0
4 = -15.17
5 = -14.62
6 = -0.09 (should be 0.23)
7 = 14.96
8 = 0

IC12 (OPA2134)
1 = -0.003 (should be 0)
2 = 0
3 = 0
4 = -15.17
5 = 0
6 = 0
7 = 0.004 (should be 0)
8 = 14.96

IC13 (LM741)
1 = -15.16
2 = 0
3 = 0
4 = -15.16
5 = -15.16
6 = 0.008 (should be 0.02)
7 = 14.96
8 = 0

All other ICs are showing what is expected

Transistors
Q1 (MMBF5457)
D = 14.96
S = -0.08 (should be 0.02)
G = -0.1 (should be -0.02)

Q2 (2N3906)
1 = 0
2 = -0.006 (should be 0)
3 = 14.58

Q3 (MPSA13) these values all look correct
1 = -15.17
2 = -14.43
3 = -0.369

QX1
1 = 0.291 (should be 0.4)
2 = 0.792 (should be 0.9)
3 = 14.91

QX2
1 = -0.332 (should be -0.22)
2 = 0.29 (should be 0.4)
3 = 13.48

Tested on a 9VAC supply with the distortion trimmer properly calibrated. These were the values that jumped out to me, some of the discrepancies are probably within acceptable variance, but Iím including them just to be through. Maybe this helps point to a problem area? I might try subbing in 4558 chips for my 2134 chips and see if that does anything. I may also try new Q1-3 as well. Appreciate any help or insight on this one
Cheers
8
Build Reports / Re: Aion FX Lab Series Preamp
« Last post by EBK on May 16, 2022, 01:49:45 PM »
Excellent knobbage!  Those from BLMS?
9
Build Reports / Re: Double Dutch
« Last post by matmosphere on May 16, 2022, 01:24:41 PM »
Nice!! Love the artwork and thatís a great layout.
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Build Reports / Re: Aion FX Lab Series Preamp
« Last post by Martan on May 16, 2022, 12:23:26 PM »
Nice job! I did the same thing you did. Have been sitting on it since the first run. Too many projects:)
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