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Blown Ring mod fixable? (Snarling Dogs Mold Spore)
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rps-10
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PostPosted: Sun Jun 26, 2011 12:20 pm    Post subject: Blown Ring mod fixable? (Snarling Dogs Mold Spore) Reply with quote

I think I may have blown the ring mod side of my Snarling Dogs Mold Spore pedal Crying or Very sad
The little doggy eye LED lights up ok when activated but it kills all through put/sound. The wah side works ok.

I was trying stuff out on my pedal board yesterday as I have received the mouting kit from JSF and wanted to sort the order and placement out before nailing down pedals. While emddling I noticed the ring mod wasn't working - I'm using a Johnny Shredfreak PSU and daisy chain so that should be ok as the JSF PSU as far as I know is a regulated one?
Or it might of been the feedback loop that killed it?? Embarassed

Is there anyone here who could take a look and fix it for me, I'd guess its a IC chip thats gone as I can't see resisters or caps blowing??

Eternally grateful if someone can as this is the bestest of best pedals ever!




Gratuitous pedal board pic,...


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Last edited by rps-10 on Tue Jun 28, 2011 9:51 am; edited 1 time in total
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wwrrss
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PostPosted: Sun Jun 26, 2011 6:44 pm    Post subject: Reply with quote

I mess about with feedback loops loads and have never killed anything doing it, so I wouldn't think it was that, I might be wrong though.
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rps-10
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PostPosted: Mon Jun 27, 2011 11:02 am    Post subject: Reply with quote

Yeah I doubt it was anything to do with the feedback looper pedal I built and more to do with a voltage spike or something.
Reading about these pedals, they need to have a regulated supply so Ive mailed JohnnySF to confirm if the 9v PSU they supply is or not.

Also from a little bit of research this morning it seems that it is the 1044 charge pump which is the main failure point of the Ring Mod side of the pedal.

Info:
freestomboxes.org
Geofex

Is this a part I could get myself easily and have a go at replacing? Although I would prefer a seasoned pedal fiddler to sort it out for me.
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Doog
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PostPosted: Mon Jun 27, 2011 11:06 am    Post subject: Reply with quote

wwrrss wrote:
I mess about with feedback loops loads and have never killed anything doing it, so I wouldn't think it was that, I might be wrong though.


I killed my RAT with a feedback loop, so it DOES happen.
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Mike
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PostPosted: Mon Jun 27, 2011 11:13 am    Post subject: Reply with quote

1044 charge pump

Notoriously fragile; the ICL7660S is better.
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Doog
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PostPosted: Mon Jun 27, 2011 11:24 am    Post subject: Reply with quote


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rps-10
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PostPosted: Mon Jun 27, 2011 11:33 am    Post subject: Reply with quote

Mike wrote:
1044 charge pump

Notoriously fragile; the ICL7660S is better.


<best 6yr old voice>CAN U FIXIT???</best 6yr old voice>

totaly understand if you're too busy/don't want to touch with bargepole etc. Laughing
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Mike
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PostPosted: Mon Jun 27, 2011 11:52 am    Post subject: Reply with quote

Um - maybe? There's no guarantee that is all that's wrong with it I'm afraid, but I'll probably be able to take a look at it for you, however do you think you could snap some gutshots so I can see what I'm playing with here?

I'm pretty stacked with builds at the moment, but there's a chance I can get some time to look at it on my bench.

Have you got a DMM? If so you could have a look at getting some IC pin readings which might help us figure uot what's up.

You getting any status LEDs or anything?
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rps-10
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PostPosted: Mon Jun 27, 2011 1:14 pm    Post subject: Reply with quote

DMM = Digital Multi Meter? Yes, have one.
IC pin readings: What do you need ( 1 to 3 etc? Or 1 to ground?? Long time since I did electronics/physics in college)
Gut shots, can do when I get home, or in morning.
LEDs status on both work (1 for Wha, 1 for ring mod) however turning ring mod on, cuts all signal from pedal silence. (wah side on it's own works fine, with ring mod activated, silence again)

edit >> is a "1044" also know as MAX1044
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Mike
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PostPosted: Mon Jun 27, 2011 2:31 pm    Post subject: Reply with quote

Stick the black probe on ground and set the DMM to 20V DC (V and a solid line most likely with a 20 section).

Then give me the IC pin values for all ICs and what the ICs are called. Take some photos also please.

Check out pinouts of the ICs to make sure you're giving me the correct pin numbers but generally ICs look like this:



yes MAX1044 = 1044

If it's anything like the Klon you'll have 9V on pins 1 and 8, and then off pin1 there'll be a couple of diodes in series and then the output of those will be your double voltage output, should be around 15V

V- will come from pin5, should be around -8V

Ground should be on pin3.

All IC pin voltages will help a little. It could be the IC or one the electrolytic caps near it that is buggered if the voltages aren't right.
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rps-10
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PostPosted: Tue Jun 28, 2011 9:55 am    Post subject: Reply with quote

Got some gut shots this morning before leaving for work. Last day in for me today so will be able to get IC pin voltages some time tomorrow.


bigger version



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Mike
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PostPosted: Tue Jun 28, 2011 10:18 am    Post subject: Reply with quote

Yikes. Lots of stuff going on there.

OK so LM565CN = Phase Locked Loop (PLL)


LM324N - Quad Op-Amp


This will help me with the voltages when you get them.

First impressions - could be a bastard to get the board out and also to desolder any chips if I need to, but I may be game for this. I think the DIY Community have been after one of these to RE so I could also get some photos up for people and they might be able to help debug also.
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rps-10
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PostPosted: Wed Jun 29, 2011 9:15 pm    Post subject: Reply with quote

All with ring mod on (patch leads in both jacks) and powered by mains PSU not battery.

MAXX1044

1, 18.06 ................... 8, 18.06
2, 11.45 ................... 7, 6.57
3, 0.00 ................... 6, 8.62
4, 4.65 ................... 5, 0.12


LM565CN

1, 2.99 ................... 14, 0.00
2, 0.00 ................... 13, 0.00
3, 0.00 ................... 12, 0.00
4, 12.64 ................... 11, 0.00
5, 12.64 ................... 10, 14.37
6, 13.29 ................... 9, 10.00
7, 13.29 ................... 8, 13.27


LM324N

1, 0.98 ................... 14, 13.60
2, 0.48 ................... 13, 0.00
3, 0.17 ................... 12, 0.00
4, 16.41 ................... 11, 0.96
5, 0.57 ................... 10, 0.10
6, 1.54 ................... 9, 1.07
7, 0.98 ................... 8, 6.35


HTH
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Mike
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PostPosted: Thu Jun 30, 2011 7:31 am    Post subject: Reply with quote

Hmm.. the MAX1044 voltages look way different to the ones I've seen from the Klon, but that might be a red herring, it could just be configured differently.

What's really strange is pins 1 & 8, which are connected together, are both 18V, I was expecting 9V. Or does this thing use a greater than 18V supply and a recitfier?

Klon Charge Pump voltages:

1, 8.98 ................... 8, 8.98
2, 4.47 ................... 7, 6.62
3, 0.00 ................... 6, 4.40
4, -4.47 ................... 5, -8.72

Compared to what you're seeing

1, 18.06 ................... 8, 18.06
2, 11.45 ................... 7, 6.57
3, 0.00 ................... 6, 8.62
4, 4.65 ................... 5, 0.12

I guess it's just configured differently to produce +18V instead of +-15V like the Klon Charge pump.

Hmm. Not sure what to suggest, I've requested working IC voltages from FSB.org but had no reply and sinec I don't have a scope I'm not sure what I could do to debug this without them - sorry mate.
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rps-10
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PostPosted: Thu Jun 30, 2011 7:39 pm    Post subject: Reply with quote

Using a normal 9v supply, I've read that it steps up the voltage a bit. Thanks for taking the time to have a look and if you know (or anyone else knows) of anyone that can fix it I'd be most grateful.

I suppose on the other hand I still have the great wah effect but now really do need to save for a HAX (or maybe the Black Cat ring mod) and expression pedal.
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Mike
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PostPosted: Mon Jul 04, 2011 8:01 am    Post subject: Reply with quote

The guy from FSB has kindly agreed to post IC voltages so that may help us.
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rps-10
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PostPosted: Mon Jul 04, 2011 4:04 pm    Post subject: Reply with quote

Thanks Mike, that's a bit of good news (hopefully)



Theres a Mold Spore for sale on ebay at the mo, over 100 already. Not the most reliable of pedals Wink
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rps-10
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PostPosted: Fri Jul 06, 2012 4:57 pm    Post subject: Reply with quote

Mike wrote:
1044 charge pump

Notoriously fragile; the ICL7660S is better.



One year later... (hadn't realised it had been that long)



A TC1044 was also suggested but I couldn't find any without huge minimum buys. The chap from North Effects recommended this 7660 as well

I am now armed with de solder wix and pump, I have the board out of the pedal - that was the easy bit. Hopefully tomorrow (or sometime soon) I'll remove the 1044 IC and solder in a DIL socket, then see if this IC L7660SCPA will work it's magic.
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Mike wrote:
All my LEDs are bright, the blues are bright as all hell.

mezzio13 wrote:
JJ makes sweeps look easy and effortless. His nick name should be broom.
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rps-10
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Joined: 29 Jan 2011
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PostPosted: Sat Jul 07, 2012 10:32 pm    Post subject: Reply with quote

Not to blow my.own trumpet but...



it fucking works!


Laughing
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Mike wrote:
All my LEDs are bright, the blues are bright as all hell.

mezzio13 wrote:
JJ makes sweeps look easy and effortless. His nick name should be broom.
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Mike
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PostPosted: Sun Jul 08, 2012 10:32 am    Post subject: Reply with quote

Well fucking played
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