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Topic: MN3007 ADA Flanger Clone Questions (Read 52434 times)
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Fender3D
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OK. If I keep R28 at 1M5, and I were to install a trimmer pot for R27.... what value would you suggest? If 100 ohms is too low  1K might be a nice start... The series pot (Threshold pot) is only 10KB. Should I try a 100K multi-turn trimmer in place of R27?
Better a 50k-100k pot instead of 10k...  EDIT: lol Charlie beats me by 12 seconds... my BBD is longer than his...  |
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« Last Edit: February 23, 2012, 10:00:00 AM by Fender3D »
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"NOT FLAMMABLE" is not a challenge
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Govmnt_Lacky
Posts: 3336
I'M ONLY GETTING CLEAN OUTPUT!!!!
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What value are you using for the main threshold control? Increasing that from 10K up to 100K should help, if you haven't done that already.
I am using the called-for 10KB pot. I have read about using a 100KB in place of it but, I really wanted to stay "true to form" to the original if at all possible. It's not looking that way though  According to the factory alignment specs, there really is no "adjustment" for the Threshold level. It is basically a procedural op check with no reference as to what is next if the op check is BAD  Sweet looking build, BTW!
Thanks Charlie! Great board to work with makes it all possible  1K might be a nice start...
Might be worth a try. Swapping out the Threshold pot now will be a bit of work as it will require digging out the PCB to get to it. This is all crammed into a 1590DD  |
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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
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moosapotamus
Posts: 1490
New Hampshire USA
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lol Charlie beats me by 12 seconds... my BBD is longer than his... 12 seconds!!! What took you so long? You're not even in BBD territory any more!  I have read about using a 100KB in place of it but, I really wanted to stay "true to form" to the original if at all possible. It's not looking that way though According to the factory alignment specs, there really is no "adjustment" for the Threshold level. It is basically a procedural op check with no reference as to what is next if the op check is BAD Yeah, "true to form" is a bit of a stretch with this circuit, anyway. I'm up to rev.5, and that's on top of all the previous "factory" revisions. If it weren't for the hassle of disassembling your shiny new pedal, I'd still say that swapping in a 100K threshold pot would be your best bet. There has been a bit of renewed interest in this circuit, lately, and there are a few things that could be updated in the documentation, too. Since I happen to be in the process of rebuilding/updating my website, I'm going to clean this stuff up, too. Might even have to order another batch of PCBs.  ~ Charlie |
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Govmnt_Lacky
Posts: 3336
I'M ONLY GETTING CLEAN OUTPUT!!!!
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Yeah, "true to form" is a bit of a stretch with this circuit, anyway. I'm up to rev.5, and that's on top of all the previous "factory" revisions.
Indeed! It sure would be interesting to know what the exact pot value was in the original AND re-issue versions of the A/DA Flanger  If it weren't for the hassle of disassembling your shiny new pedal, I'd still say that swapping in a 100K threshold pot would be your best bet.
Might do just that! There has been a bit of renewed interest in this circuit, lately, and there are a few things that could be updated in the documentation, too. Since I happen to be in the process of rebuilding/updating my website, I'm going to clean this stuff up, too. Might even have to order another batch of PCBs. Let me know if you decide to do any small runs of the SAD1024 version |
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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.’
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Fender3D
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12 seconds!!! What took you so long? You're not even in BBD territory any more! lol I got the longest SAD on Earth (1024*1024)  |
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"NOT FLAMMABLE" is not a challenge
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moosapotamus
Posts: 1490
New Hampshire USA
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What a curiosity!  |
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Valoosj
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There has been a bit of renewed interest in this circuit, lately, and there are a few things that could be updated in the documentation, too. Since I happen to be in the process of rebuilding/updating my website, I'm going to clean this stuff up, too. Might even have to order another batch of PCBs. ~ Charlie I really should get back to this too. Only have to wire it up and then keep my fingers crossed that it works |
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You squeezed it into a 1590A - you insane fool! Well this... this is just silly... this can't fit in a 1590B... can it? And you're not even using SMD you mad man! |
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Govmnt_Lacky
Posts: 3336
I'M ONLY GETTING CLEAN OUTPUT!!!!
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Performed a successful surgical operation last night! Removed the 10K Threshold pot and replaced with a 100K. Happy to report that the patient is fully recovered and that the patient reports an increased range of motion Definitely worth the risk!!  |
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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.’
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moosapotamus
Posts: 1490
New Hampshire USA
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Cheers, Lacky! ~ Charlie |
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njkmonty
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 im about to build my second moosapotomus flanger but stuck on resistor 7 if you look at the above pic there are 4 holes in particular, 1 to the left of the "R" outside the R7 Rectangle the 2 holes within the R7 Rectangle which are joined, and.. the hole on the right of the R7 Rectangle coming from the positive side of c5 can cap where do i put resistor? the 2 holes outside the R7 Rectangle? |
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« Last Edit: October 06, 2012, 03:50:21 AM by njkmonty »
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12Bass
Posts: 230
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where do i put resistor? the 2 holes outside the R7 Rectangle? On the schematic, R7 goes between pins 4 and 12 of IC2. So, that means that the left lead of R7 is inserted to the left of where you see R7 indicated on the parts layout picture, and the right lead of R7 is inserted to the left of where C5 is indicated. Happy flanging! |
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It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring. - Carl Sagan
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LaceSensor
Posts: 244
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Hey all
Whats the best place to start troubleshooting if I have nothing at the output?
Ive got 7.5v at Vb (1/2 supply) and 15v ish on the main voltage rails to the ICs etc
I have LFO working, I have sound on various pins of the quad opamps... stumped.
Thanks
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Govmnt_Lacky
Posts: 3336
I'M ONLY GETTING CLEAN OUTPUT!!!!
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Hey all
Whats the best place to start troubleshooting if I have nothing at the output?
Ive got 7.5v at Vb (1/2 supply) and 15v ish on the main voltage rails to the ICs etc
I have LFO working, I have sound on various pins of the quad opamps... stumped.
Thanks
Hey Lace, You might want to post a new debug thread with the applicable voltages from the "What to do when it doesn't work" thread. Have you verified all your offboard stuff? |
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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.’
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oldschoolanalog
Posts: leet
leet forever!
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Get schematic, signal source, and audio probe/O'scope. Start probing at the output and work your way "backwards". I know; sounds like the "simpleton" method. It does work however. I do it like that but then again "simpleton" applies in my case... |
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Mystery lounge. No tables, chairs or waiters here. In fact, we're all quite alone.
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LaceSensor
Posts: 244
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OK I can do that
Im just in a fudge right now. a lot of things arent working for me (inc personal stuff :/ )
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LaceSensor
Posts: 244
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Fixed. Output volume control was on the bit of perf that also connects to ground....IDIOT
haha
well at least it was an easy fix once I opened my eyes and mind
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Skruffyhound
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Ok, I'm back looking at tuning this in better, thanks to Charlie's excellent videos.
However, I'm not having much luck getting the frequencies tuned. I can obviously get one or the other but no matter what I do one remains out of range.
I think the closest I came last night was 2.9 Mhz and 69Khz.
I checked the power supply and found I was a little low too - 14.55V on the output of the regulator. I will investigate the power issue tonight, but is there any chance these two things are related?
Any ideas?
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armdnrdy
Posts: 697
Larry L.
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Hi Aston,
Are you refering to the adjustment of TR4 and TR5? If so I believe that I have a fix for you.
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moosapotamus
Posts: 1490
New Hampshire USA
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Interested to hear what you have in mind, Larry. Aston - Instead of trying to nail specific numbers, how does it sound to you? 2.9Mhz is kind of high for my taste. Personally, I don't hear much effect above ~2.5Mhz. But there is a lot still going on below 69.6Khz. So I usually tune the whole range down a bit anyway. Are you able to try something similar? IMO, the sound is more important than the numbers. ~ Charlie |
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