Zero Point Micro II no delay sounds

[madbean]

Well it works now but I have to crank my amp to get volume from it.  It sounds amazing when I can hear it. A little "buzzy" and "crackly" when I am adjusting the pots but it is not fully enclosed in the box at the moment and wires are being wriggled as I adjust the effect levels so maybe that is the issue there. Any suggestions on the low volume when effect is engaged?. Jumps way up when I turn off the effect. Happy it works (sort of) and have to say it is one awesome sounding delay.

Sorry to ask this, but can you give us one more pic of the top? One with all the resistors in view. I can read off the resistors for you to see if you have a wrong value somewhere. That would be a likely cause of low output.

[pogart]

Hers is the front of my board. Hope this is ok since I was not the original poster here. We did seem to have similar problems with the build. I'm learning but a little frustrated. Thanks to everyone that has posted tips and help.
POGART

[copachino]

Brian, i have a very small question im building the ZPMII but im forgot to get a 10pf cap, only have 100pf caps, C2 seems tobe feedback on IC1 on the first OPamp, would the change to 100pf make a big problem?? IMO no... but maybe it will alter the amp stage a bit... so im no so sure... btw man love that layout and the muddbuny amazing look

[Aryk]

Pogart - Don't know if you noticed yet but thought I'd mention it. It looks like the TL072 IC is backwards.


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[copachino]

totally right, that IC its backwards, that why you are not getting it right

[pogart]

Holy crap it's been staring me in the face for ages lol. Thank you so much for the extra eyes and speedy input guys. I rewired, reflowed and reworked this thing a whack of times. I will flip that around and let you know how it go's. Again thank you so much.
POGART

[Aryk]

Let's just hope that's the fix if so awesome!


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[pogart]

I flipped it around and plugged it in and all I get now is a high pitched feed back and the IC and the pt2399 heats up fast. I didn't leave it on for more than 30 seconds and it was hot to the touch. I had some effect sound before but now it's just feedback type squeal and heat. Any suggestions would be cool.
POGART

[copachino]

can you get voltages again?? on the PT and on the TLC072

[wgc]

TL072s get really hot when you install them backwards.

Try a new one in the orientation you had previously.

I had a similar issue with a deep blue delay build.  First it got hot, then I switched it and low output.  New part did the trick.

good luck!

[pogart]

OK cool, so I guess the first way I had it was correct?, since it is now hot to touch?. As for readings I can't seem to get anything close to recommended. All are negative?. Maybe I am testing wrong but at least I am keeping my patience...sort of lol

[copachino]

just keep you black testing  end on a ground place and the positive REd on the points to meassure

[pogart]

Thanks man, I flip the ic and then take the readings again. I'll post them regardless of how odd they look and maybe that will point me in the right direction. I had it working but just low volume then I tinkered around with it and lost it.

[copachino]

hey buddies i just finish my ZPMII and had a bunch of PT2399 to try most of them taydas and some are noise buy i got one that does the same no delay no pots about the same of yours readings so im guessing that you problems its the IC, what i do its i have a cave dweller just to try any Pt2399 before soldering right without any sockets just to know the IC was good before soldering and always take my time on soldering the ICleg by leg and letting cool before going to another leg

[wgc]

Thanks man, I flip the ic and then take the readings again. I'll post them regardless of how odd they look and maybe that will point me in the right direction. I had it working but just low volume then I tinkered around with it and lost it.

could be other things but sounds like a problem with the op amp or something between it and output.