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Messages - bschobs

#1
Tech Help - Projects Page / Re: Cupcake 2020- noise
August 12, 2020, 04:25:00 AM
Hey guys, I'm sure you've lost plenty of sleep wondering whether or not I got this thing working correctly lol.

Alright so I took voltages and reflowed the power and grounds and maybe a couple of others that could have been questionable, then took readings again.  Also re-tested and still will get this kind of trashy sounding noise that isn't at all musical coming into the signal and the trimpot is still basically ineffective.

Germanium diode voltage is the same with guitar plugged in or not.  Zero.  (0.1 if on the 200|m setting)

The rest are as follows.  The first number is in the build doc as it should be, the second is my actual reading:

IC 1
1 - 5.04 - 5.00
2 - 5.04 - 5.00
3 - 4.92 - 4.12
4 - 0 - 0
5 - 0 - 0
6 - 9.16 - 8.52
7 - 9.16 - 8.52
8 - 9.18 - 9.12

Q1
D - 2.12 - 1.04
S - 2.14 - 1.46
G - 1.32 - -.02

Q2
D - 9.2 - 9.12
S - 2.92 - 2.19
G - 2.14 - 1.46

#2
Tech Help - Projects Page / Cupcake 2020- noise
August 03, 2020, 08:06:48 PM
So I boxed up this cupcake last night and she has a couple of issues:

1 - When I measure the trim pot gate, the closest I can get to the suggested 1.5v is 1.0v, and that is with the trim pot dialed all the way counter clockwise.

2 - If I play even moderately loudly on my guitar, I get a crackling sound coming from the effect. This does not occur in bypass.

I can provide more details if needed but my assumption is maybe an incorrect value somewhere? Can anyone point me towards some good starting points?

She's not the prettiest on the inside...





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#3
Open Discussion / Re: Envirotex Help Thread
July 30, 2020, 07:58:23 PM
Great advice thank you. I have another I am going to attempt this weekend!


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#4
Open Discussion / Re: Envirotex Help Thread
July 30, 2020, 02:09:06 PM
I definitely poured too heavily... basically the sides are covered and the drips are down all the way at the bottom edge of the enclosure.  I did this before I saw the suggestion of 5ml for a 1590b so...

It potentially looks great though if I can clean up the bottom edges.  Probably ok to wet sand down there?

Thanks for the help!


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#5
Open Discussion / Re: Envirotex Help Thread
July 30, 2020, 05:35:45 AM
Ancient thread here, I know.  Just did my first envirotex and I'm sure I'll have some corrections needed on the bottom edge of the enclosure. Followed Creggys tutorial.

Can anyone comment on sanding Envirotex?

Muchos gracias
#6
m-Kresol - Saw your post after I had this all typed up.  I'll follow those steps, thanks!

jimilee-

First of thanks for the response and for having a look!  Yes it is definitely going to be a new addiction for me I already have several others to build but not until I get this one going.

So yeah my test box is probably terrible.  I have it hooked up to the audio probe right now.  Power is slightly off the photo with alligator clips to a slimline 9V jack.  When I had the effect working prior to cramming into the enclosure, I hadn't built the test box yet and had everything wired to the board.

- I have verified that no pots are touching anything on the solder side of the board.

- The dry signal is coming out and then as I turn the Blend to bring in the wet signal it brings in that drone sound.

If these pics aren't sufficient let me know.  Thanks again!
#7
Hey guys so I'm working on building a Florist and considering it my first build.  I did build one other thing but I renamed it "Learning how to solder".

Anyway, I put it together and tested it outside of the box, sounded awesome.  I think I made a mistake by wiring everything outside of the box and then cramming it in, and sure enough once it was inside... nothing.

So I take it back out and now the effect itself isn't working so I guess it was more than just wiring.  I have tried a bunch of different things and am now attempting to trace the signal.

My findings are that at IC 1 (TL072) I get a signal on pin 1, but a constant mid-range tone on the pin 7 which I think should be output 2.  Now I go up to resistor 6 and I have signal on one side but not the other.  No signal on resistor 7.  Visually they look like they are soldered well.  I did put heat on them to make sure they were in the pads but did not add any additional solder.  Not sure what the proper "reflow" technique should be.

One other thing is I noticed the regulator gets super hot to the touch, is that normal?

Truly appreciate help/advice as I cut my teeth learning this stuff.


Thanks!