Ok so I lost round one with this pedal but I think I can win this battle.
So let me preface this with this: this is my first Madbean build and I'm super excited about this process. I've built a couple of BYOCs to get comfortable with the process before I tackled this project. I'm not super proficient in terms of troubleshooting so I was hoping you folks could help me out.
My readings on my ICs are truly all over the place
IC1
1- 7.56 (woah!)
2- 5.85
3- 0
4- 0
5- 4.34
6- 4.34
7- 4.34
8- 8.24
IC2
1- 4.05
2- 2.01
3- 0
4- 0
5- 2.20
6- 2.02
7- 0.10
8- 0.68
9- 2.02
10- 2.02
11- 2.02
12- 2.02
13- 2.02
14- 2.02
15- 2.02
16- 2.02
IC3
1- 5.92
2- 3.10
3- 5.82
4- 0
5- 3.10
6- 5.79
7- 6.50
8- 6.50
IC4
1- 4.37
2- 4.37
3- 2.15
4- 0
5- 4.24
6- 4.37
7- 4.37
8- 8.25
So I've obviously done something wrong along the way. I can post pictures of my build later on if it helps.
First off welcome to Madbean's Forum!
if you could tell us what your circuit is doing, if anything, and clear pictures of top and bottom of the board are very helpful.
The usual culprits are solder bridges, cold solder joints, and getting the wrong part in there, we all do that, well I do that. The easiest parts to mix up are resistors that are in Ohms like 240R with Kilo ohms 240K and capacitors which are pretty confusing at first.. So a picture of the component side helps to check that out. Double check that you don't have an I.C. in backwards.
Here's a few guidelines for trouble shooting:
http://www.madbeanpedals.com/forum/index.php?topic=902.0 (http://www.madbeanpedals.com/forum/index.php?topic=902.0)
Here is a download you should get if you have a Windows computer.
Electronics Assistant. It has all the resistor color codes and everything you could need
www.electronics2000.co.uk (http://www.electronics2000.co.uk)
Still waiting on the pictures and description of your issues..
Your voltages look kind of odd around ic 1. I don't think pin 3 should be at ground. I would start by looking for solder bridges or shorts in that area. It looks like there may be more issues as well but get that corrected first. Read the troubleshooting tips thread and post pictures!
Quote from: Luke51411 on April 29, 2015, 02:39:01 AM
Your voltages look kind of odd around ic 1. I don't think pin 3 should be at ground. I would start by looking for solder bridges or shorts in that area. It looks like there may be more issues as well but get that corrected first. Read the troubleshooting tips thread and post pictures!
(http://www.shattuckelectronics.com/pics/PINS%20IC1.jpg)
Ok guys, I took a little break because I got a little frustrated with this. Also I broke rule A#1 and taking it apart seemed like a chore. :P
The only function when powered seems to be the level control. The delay seems to "click" a little but it doesn't seem like signal is getting to it.
I checked my component values and they seem to be correct and I might be a huge doofus and missed one or something.
I'm gonna check the solder pads around IC1 and clean up the board using some alcohol.
(http://i.imgur.com/Q6f7lLt.jpg)
(http://i.imgur.com/EXAwH5H.jpg)
Edit: yep, there was messy joint between pin 4 of IC1 and R10. Also I missed a pad on IC2 and a there was a gross joint in there too.
What's that old saying? "it's your soldering, kid..."
It may be helpful check voltages again and post them. Also I would recommend building an audio probe and following the signal path to see where it stops. Are you getting dry signal but no delay?
(http://www.diystompboxes.com/pedals/audioprobe.jpg)
update! functioning! yeah!
Only issue I'm having with it now is that the modulation doesn't really seem to be doing much. If I tweak the depth knob while signal is going through, it moves but then goes back to stationary. Also the level and depth controls seem to be quite a bit more sensitive than I think that they should be; like 50/50 blend happens around 9 or 10 o'clock on the blend knob.
Awesome! Glad you got it going. Ic 3 is the LFO, I would check voltages there and look at the solder in they are for bridges or bad joints.
Yeah IC3 is pretty wonky. I discovered that my socket was installed backwards (which probably doesn't do anything), but I flipped it and now my voltages there are even more strange.
1. 0
2. 4.17
3. 0
4. 0
5. 4.17
6. 0
7. 0
8. 0
That's, uh, not good. my connections look pretty secure and neat. I just tried cleaning it with isopropyl and that seemed to help at first but didn't really look like it did the trick. Any more ideas on what I could try here?
Socket orientation doesn't matter, ic orientation is the only thing that matters.
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Yeah, I figured but it was really bugging me aesthetically. Compulsive behavior lol.
Quote from: knifedawg on May 03, 2015, 06:03:07 AM
Yeah IC3 is pretty wonky. I discovered that my socket was installed backwards (which probably doesn't do anything), but I flipped it and now my voltages there are even more strange.
1. 0
2. 4.17
3. 0
4. 0
5. 4.17
6. 0
7. 0
8. 0
That's, uh, not good. my connections look pretty secure and neat. I just tried cleaning it with isopropyl and that seemed to help at first but didn't really look like it did the trick. Any more ideas on what I could try here?
What if you remove the IC. What do you get on pins 8 and 4 in just the bare socket?
I'm still getting zeroes with the IC removed. :/
(http://i.imgur.com/AXJyAET.jpg)
Alright so I fidgeted with that socket and replaced it and I think the problem is that socket 8 is kinda gross. Solder won't flow onto it. What do you guys recommend I do so that I can fix this and get this running 100% finally? Just use a little flux?
If the pad is completely lifted, you'll have to jumper it to whatever is next in the circuit. If you can't see the traces on top, use the schematic.
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Okay, so I'm having a doozy of a time with this thing and I'm a damn moron when it comes to reading schematics.
(http://i.imgur.com/Qq1kpIx.png)
Can you help me figure out where to jump pin 8 of IC3?
Straight up to R46 or the positive leg of C40 look like your best bet.
lol word I went up to R46 and we've got voltage to pin 8! but still none to the pins 1, 3, 6 and 7 on IC3. I think I'm just going to try to jump all these pins that I'm not getting readings on to see if it helps.
YEAH SCIENCE
update: made it way worse. this is a farce. lifted all the pads on this IC. maybe I should take a mulligan on this build. :(
Quote from: knifedawg on May 05, 2015, 09:30:28 PM
update: made it way worse. this is a farce. lifted all the pads on this IC. maybe I should take a mulligan on this build. :(
I admire your moxy. You have 2 options and one seems like way more work than learning from your mistake and ordering another board.
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Given how hard you have been trying on this, I don't mind sending you a free replacement PCB. I wanna see you succeed.
oh wow, thanks Brian! that means a lot!!! ;D I'll send you an email later tonight.
Round 2 has begun and it's going well! I just have one question: R16 is supposed to be 20k, but I don't have one of those on hand. Can I use an 18K or 22K instead?
Quote from: knifedawg on May 11, 2015, 08:47:44 PM
Round 2 has begun and it's going well! I just have one question: R16 is supposed to be 20k, but I don't have one of those on hand. Can I use an 18K or 22K instead?
yes
Quote from: jimilee on May 12, 2015, 02:04:12 AM
Quote from: knifedawg on May 11, 2015, 08:47:44 PM
Round 2 has begun and it's going well! I just have one question: R16 is supposed to be 20k, but I don't have one of those on hand. Can I use an 18K or 22K instead?
yes
If you measure the resistance with your multimeter, depending on tolerances you might find an 18k or 22k that is actually 20k anyway.
(http://i.imgur.com/rPQZOq2.jpg)
Got it up and running 100% tonight, first try even. All my voltages are right on. Wow I'm so much better at this than I was even a week ago. I built a couple of big muffs for some friends that made for some great extra practice before tackling this again. Thank you guys so much for your help. Probably would have given up if not for the support of this community. :D
Extra big shout out to Brian for being a #1 dude.
Fully awesome dude. Congrats on an epic build! 8)
Success! Love to see this!
(http://img.4plebs.org/boards/s4s/image/1397/50/1397503174163.png)
One more question, ya'll. Is there anything I can do to make the repeats a little brighter? The mod suggested in the PDF to make the Dirtbaby darker is to change C9 and C10 from 2n2 to 4n7 to make it darker. Would lowering those cap values make it a little brighter?
Yes
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