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Hello @Droogie,
A bit of a longshot as this is such an old topic but, did you ever get your problem fixed, I seem to be getting the exact same problem...  High pitched whine, some oscillation interaction with guitar signal and all controls seem to work as they should, most certainly too much gain and it's rather spluttery...

Cheers

Thanks again for your help so far.

I had figured it might be something in the feed forward paths so that was going to be my next step.  Have checked all the components in those paths and they all seem correct although I did change out one or two components as their tolerances were quite far off their proposed value.

Unfortunately, it still sounds messed up from the same point.  I've pulled IC2 now and put a socket in.  With no IC2 in place I get seemingly correct sounding audio but as soon as I put an IC in, of which I've tried several TL072's and a couple NE5532's, it sounds wrong again.  I've checked all components around this IC now as well and they seem to be correct.

Connecting directly to the output I'm getting a high pitched whine, oscillation that interacts with the guitar signal.  I'm guessing IC2 is clipping too hard and latching up from the summing of the two feed-forward networks and the main gain stage.

Thanks Mauman, checked everything out and audio traced and found out why I had no real output - I had no continuity between the output pad and the output 100k/Switch 5.  Looks like the output pad had detached from the PCB - Jumpered to the wire and I had proper bypass again.

Alas, it's not all good news, when the effect is engaged I've basically got a spluttery fuzz pedal.

The signal seems to get messed up after the 47k/before IC2. 

...and of course it didn't work.

I was tidying up the workbench and found this Klone half finished and then found a random bag with all the missing parts in it.

I don't know if it was past me or current me that's screwed up here but any help appreciated.  It's outputting at a very, very low volume in both bypass and on.

Photos of the board can be found here:
https://photos.app.goo.gl/Ei6HHkGNMeM9cRZ77

Voltages of IC's as follows:
IC1 - Bottom TL072
1: 4.86V
2: 4.86V
3: 3.73V
4: 0V
5: 4.85V
6: 4.84V
7: 4.80V
8: 9.72V

IC2 - Middle TL072
1: 4.84V
2: 4.86V
3: 4.85V
4: -9.13V
5: 4.86V
6: 4.86V
7: 4.88V
8: 17.35V

IC3 - Top TC1044SCPA
1: 9.74V
2: 4.88V
3: 0V
4: -4.57V
5: -9.13V
6: 7.12V
7: 7.09V
8: 9.73V

Looking at the schematic it looks like the voltages for IC1 aren't right and should match IC2 - should I swap this out?

I've been through and reflowed all joints and ran the iron between all pads to make sure nothing was shorting too.

Thanks all!

Hi,
thanks for this.

I should have mentioned though that I messaged Dave directly and he e-mailed it over.

thanks anyway

Hi,
Fixing up my mates broken Bad Stone has given me the bug to start up this hobby again (will see how long that lasts).

I want to put a little something extra in the package when I send his Bad Stone back so, any suggestions for any small and weird effects I could build up and gift them?

Cheers

Hi,
It's been a while since I've build anything and I'm looking for build docs for old unfinished projects.

Does anybody have build docs for the MiniTaur V3.1, I'm pretty sure it's a PickDropper 1590A Klone.

Thanks

Thank you, obviously your stuff looks impeccable as always.  I've just moved house so it's been nice this week to be able to cook some decent food after weeks of rummaging around boxes.

I'm pretty damn jealous of your butane burner, I'm Chinese and it just looks perfect for asian food, our new house currently has an electric ceramic hob, my wok is feeling pretty neglected right now

Marcus

A few things from the last week











Bibimbap with a Miso soup; Chinese meal: tomato & egg stir fry, mixed mushrooms and asparagus, tofu and spinach soup, chicken wings; wontons; veg sushi; veg summer rolls

Marcus

Got around to reading through everything. I see it's a few mm shorter than the bs, looks nice!

Would definitely make top mounts easier, I squeeze them into the normal 1590B Eddystone equivalents atm.

Marcus

I probably shouldn't post because I haven't read any of the above posts or the link

Buuutttt, isn't there already a taller 1590b, i think it is 1590bs (or maybe I'm talking bs)

Marcus

If you're still set to order within the UK:

http://uk.farnell.com/cliff-electronic-components/fc681473/connector-receptacle-dc-power/dp/2353931

Couldn't find any mini DC's with external nuts though, only metal ones.

Marcus

This has got me thinking actually.  Is there such thing as mini DC jacks like the Lumberg ones but with the nuts externally?

Sorry to hijack.

Marcus

I'm in the UK too and I have RS and Farnell Trade counters just down the road from me and shipping from Tayfa really isn't that bad.

Just stock up on pots and use a discount code, it's still cheaper.

Hope that helps.

Marcus

Hi,
I've been looking for knobs similar to the chase bliss audio ones which look like they might be anodised metal ones from the pictures(?)

Any ideas where I may be able to get some? If they're push on ones for knurled knobs, even better.

I'm in the UK so have already looked at Farnell, RS, etc. but didn't have much luck for the shaft size and length we're all used to using, though I could have easily missed them.

Cheers,
Marcus

Marcus