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SSM2166 Compressor help

Started by bdevlin, February 11, 2011, 08:07:53 PM

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bdevlin

February 11, 2011, 08:07:53 PM
I built a Q&D compressor based on the layout in this thread:   http://www.diystompboxes.com/smfforum/index.php?topic=87300.0.  I'm getting a VERY distorted low output.  I ended up using a SMIC.  I'm fairly confident I did a good job soldering it up.  Would it help if I posted voltages from the chip?  Meaning could someone help me.  I went through the board and found some solder bridges that I have now fixed.  So the downside is that I did power it up before I fixed those.  The simple stuff is all there...5v to the 2166, off board wiring verified.

Govmnt_Lacky

#1
February 11, 2011, 08:16:15 PM
I just built this same project!  ;D

I could help if you need it. Go ahead and post voltages on the transistor, regulator, and the SSM2166 and I will compare.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

bdevlin

#2
February 11, 2011, 09:15:11 PM
Great.  Thanks.  I should get to it in the next couple hours.

Govmnt_Lacky

#3
February 11, 2011, 09:23:54 PM
Getting late here. If you post voltages in a few hours, I will most likely respond tomorrow. I will get to it though  ;)
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

bdevlin

#4
February 11, 2011, 09:51:21 PM
Okay here goes......
Supply = 9v, I took measurements with all pot fully clockwise including the trimpot.  Use the same pots as noted in layout.
Regulator is  9v, 0v, 5v.  No issues there
MPF102 is 9v, 2.1v, 0v.  Seems reasonable right?

SSM2166 pins

1 - 0
2 - 0
3 - .44
4 - .66
5 - .48
6 - .48
7 - 0
8 - .6
9 - 1.6
10 - 0
11 - .58
12 - 0
13 - Seems to go from .4 to .16 at power up
14 - 5

bdevlin

#5
February 11, 2011, 11:28:21 PM
I also retraced my steps to see what components were shorted due to solder bridges.  Looks like initially I have 9V to ground :icon_lol:  That's never good.  I also a lugs 2 and 3 of VR5 shorted.  That should not have caused any issue.  BUT, after fixing the 9V to ground, I did not realize that I had a bridge that shorted Pins 2, 13, and 14.  So the 5V on Pin 14 was shorting to 13 and 2.  Not sure if that did the chip in or not.

Govmnt_Lacky

#6
February 12, 2011, 08:06:06 PM
Quote from: bdevlin on February 11, 2011, 11:28:21 PM
I also retraced my steps to see what components were shorted due to solder bridges.  Looks like initially I have 9V to ground :icon_lol:  That's never good.  I also a lugs 2 and 3 of VR5 shorted.  That should not have caused any issue.  BUT, after fixing the 9V to ground, I did not realize that I had a bridge that shorted Pins 2, 13, and 14.  So the 5V on Pin 14 was shorting to 13 and 2.  Not sure if that did the chip in or not.

Only one way to tell. Fix the bridges, recheck power, and fire it up! If you still have problems then repost with the new voltages and we will work from there.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

bdevlin

#7
February 13, 2011, 01:08:41 AM
Those voltages are after all the bridges were fixed.  I was merely stating what perhaps could have caused damage to the chip.

Govmnt_Lacky

#8
February 13, 2011, 09:16:54 AM
OK, I will try to get some voltages up later today.
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

Govmnt_Lacky

#9
February 13, 2011, 08:34:34 PM
OK here we go:

ALL outer pots to middle setting and the trim pot is set to "functional" (as in... I left it alone cause it took a while to set it just right)

Input voltage: 9V regulated.

Regulator :
In - 9V
Out - 5V

MPF102:
9V
2.9V
0V

SSM2166:
1) 0V
2) 0.15V
3) 2.5V
4) 2.5V
5) 2.3V
6) 2.3V
7) 1.6V
8] 0.57V
9) 0V
10) 1.5V
11) 4.85V
12) 0V
13) 2.3V
14) 5V

Hope that helps  ;D
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

Govmnt_Lacky

#10
February 13, 2011, 08:39:02 PM
Quote from: bdevlin on February 11, 2011, 08:07:53 PM
I ended up using a SMIC.  I'm fairly confident I did a good job soldering it up. 

How exactly did you put the small mount IC on the board? Did you use an SMT to PDIP adapter board?
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

bdevlin

#11
February 13, 2011, 09:02:27 PM
Kind of complicated to explain but I made a daughter board if you will and then soldered the leads of that to a DIP socket.  I'm going to see about making an audio probe and I'll have a go with that but I may be buying a chip at Small Bear

bdevlin

#12
February 14, 2011, 07:22:58 PM
I found a bad pot and that helped but still voltages appear off.  Let me ask you this.  Do you get any usable sound with the 1M Noise Gate pot much below full rotation?  Basically to get anything I need that pot on full and the trim pot near full rotation.

Govmnt_Lacky

#13
February 14, 2011, 09:38:08 PM Last Edit: February 14, 2011, 09:52:42 PM by Govmnt_Lacky
Quote from: bdevlin on February 14, 2011, 07:22:58 PM
I found a bad pot and that helped but still voltages appear off.  Let me ask you this.  Do you get any usable sound with the 1M Noise Gate pot much below full rotation?  Basically to get anything I need that pot on full and the trim pot near full rotation.

Sounds like you may have the Gate pot wired backwards  ::)

On my pedal, if the Gate pot is turned between 0 and about 2.... it will pass NO SOUND AT ALL! After it is turned past 2, then it "un-clamps" on the signal and it gets less clamped as you turn it clockwise.
Keep in mind that for wiring the offboard pots, all of the middle wires go to the middle lugs of the pots (wipers) BUT.... the other wires get criss-crossed. So when you are looking at the board from the component side, in the set of 3 wires to each pot..... the left wire on the board goes to the right pot lug. The right wire goes to the left pot lug.

Do you have your pots wired correctly?


EDIT: Check out Reply #26 in this post for setting up your compressor. I used it and it worked like a charm.

http://www.diystompboxes.com/smfforum/index.php?topic=87300.0
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

bdevlin

#14
February 15, 2011, 12:42:38 AM
I assume you mean that lugs 1 and 3 are criss crossed if you have the back of the pots facing you while the component side of the board faces you.  Flip the pots around then they are not criss crossed.  Are we on the same page?  Initially I did have them backwards.

Govmnt_Lacky

#15
February 15, 2011, 07:54:42 AM Last Edit: February 15, 2011, 08:02:26 AM by Govmnt_Lacky
Quote from: bdevlin on February 15, 2011, 12:42:38 AM
I assume you mean that lugs 1 and 3 are criss crossed if you have the back of the pots facing you while the component side of the board faces you.

Yes. That is what I mean.

It sounded like you have the Gate pot wired backwards. The gate should have maximum effect when the Gate pot is turned fully CCW.

EDIT: Maximum effect meaning fully closed and passing NO SOUND   ;D
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

bdevlin

#16
February 23, 2011, 10:26:36 AM
Got my DIP in the mail yesterday and popped it in and it all works.  Voltages are very similar to yours.  I must have fried that chip with one of those solder bridges.

One question though, what does this Attack/Decay switch do?

Govmnt_Lacky

#17
February 23, 2011, 10:33:54 AM
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of 'up to and including my life.'

casey

#18
February 23, 2011, 11:33:53 AM
"If you have had trouble getting the SSM2166 compressor to work, note that pin 12 has to be pulled to ground in order to power up the chip. A jumper has been inserted into the schematic and pcb layout to reflect this. You could replace the jumper with a simple SPST switch in order to have a "mute" switch for the compressor. When the switch is closed the compressor is on and when the switch is open the chip will power down." - jack orman
Casey Campbell

Mark Hammer

#19
February 23, 2011, 12:56:34 PM
Do make a point of providing some control over the downward expansion features.  VERY handy for having a quiet compressor.
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