Please help, my friendly forumites!
I'm only getting one repeat out of my cave dweller with a taptation circuit! I'm using vero layouts for both of the circuits.
(http://2.bp.blogspot.com/-G2ZmgE35Klg/U1u5zF0C8uI/AAAAAAAAG7E/9B-GQ3vvD4s/s1600/Madbean+Cave+Dweller.png)
(http://i51.tinypic.com/r19z10.png)
Here are pics of my boards. On both pics, top board is the Cave Dweller, bottom is the Taptation circuit:
(http://i1101.photobucket.com/albums/g436/brand0nli/DSC_19791.jpg?t=1407264281)
(http://i1101.photobucket.com/albums/g436/brand0nli/DSC_19801.jpg?t=1407264330)
So far, the ECHO knob controls how loud the single repeat is, all the other knobs don't do anything.
I've checked all my components and connections and all seems well.
Here are my voltages:
reg
I - 9.12
G - 0.00
O - 4.94
PT2399
1 - 4.93 9 - 2.43
2 - 2.46 10 - 2.47
3 - 0.00 11 - 2.46
4 - 0.00 12 - 2.47
5 - 3.25 13 - 2.48
6 - 2.45 14 - 2.47
7 - 0.58 15 - 2.47
8 - 0.69 16 - 2.47
Taptation
1 - 5.00 8 - 0.02
2 - 4.87 9 - 0.02
3 - 5.00 10 - 0.01
4 - 4.40 11 - 0.03
5 - 5.00 12 - 0.00
6 - 5.00 13 - 0.00
7 - 4.82 14 - 0.00
MCP41100
1 - 0.01 5 - 2.46
2 - 0.01 6 - 2.46
3 - 0.01 7 - 2.44
4 - 0.00 8 - 5.00
Have you tried different 2399 chips? Those are flaky.
Look for bridging on your solder work.
There are some places that look like they could be shorting.
Hard to tell from the pictures.
Quote from: jimilee on August 05, 2014, 07:55:56 PM
Have you tried different 2399 chips? Those are flaky.
Yup, just tried that, same problem, but here's a clip of what's going on:
The right 3 pots on the bottom row are the cave dweller controls, going DWELL, ECHO, and TIME (from the taptation circuit). The second to the right trim pot is the modulation from the cave dwellers taptation, kind of hard to see since it's black on black
http://youtu.be/l8SXNUjmnDk
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Someone should be along shortly
Quote from: jimilee on August 05, 2014, 11:51:05 PM
Someone should be along shortly
What do you mean?
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Who is smarter than me to help
Thank you, sir, for you assistance! Gladly appreciated! Already smarter than me... Haha
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Check the following:
on the pics showing the solder sides: the top board's first row (where the yellow wire connects)... There should be 3 trace cuts if I read everything correctly. The most left one looks a little too close for my liking. Take a DMM and check continuity across to make sure the trace cuts are not shorting.
Same thing on the taptation board. Since you did cut the traces instead of drilling like in the other board, make sure they are not conductively connected.
Quote from: m-Kresol on August 06, 2014, 08:10:24 AM
Check the following:
on the pics showing the solder sides: the top board's first row (where the yellow wire connects)... There should be 3 trace cuts if I read everything correctly. The most left one looks a little too close for my liking. Take a DMM and check continuity across to make sure the trace cuts are not shorting.
Same thing on the taptation board. Since you did cut the traces instead of drilling like in the other board, make sure they are not conductively connected.
Thanks for your response. I've checked everything you mentioned.
1. There are 3 cuts there, I cut them instead of drilling them so it's hard to see. No shorting between them either.
2. Checked all cuts on the taptation board. No shorts, all rows that are connected with jumpers are good.
Any other ideas?
Next check all of your components and run a blade between the rows and check all your soldering. You should probably use a magnifying glass for that. I've been building for over two years now, and screwed up the soldering on a build last week.
On it!
But can I measure capacitor values with my multimeter? My box caps aren't labeled.
Quote from: brand0nized on August 08, 2014, 02:48:27 AM
On it!
But can I measure capacitor values with my multimeter? My box caps aren't labeled.
Yes but not in the circuit. The usually have markings on the top. I'd just go by that. I'd start with the resistors first though.
Just figured out how to read the labels on the top of the box caps, looks like I put it a 100n that's supposed to be 10n, will report back.
Although I did replace the taptation chip, to see if that would do anything, not my single repeat is gone, it's just nothing...
Reporting back.
I somehow created a short where there wasn't one before, so after fixing that, I got my one single repeat back, but we're just back at square one.
Also, I didn't notice any changes after changing the 100n to the 10n its supposed to be.
I'm starting to really not like my vero projects... After this, I'm sticking to fabricated PCBs...
Ahh, vero is hit or miss. All your components are correct and correct placement? The resistors are easy to mess up, an r where a k should be and vice versa.
I will double check, but as of right now, I'm 90% sure! but that's relative to my inexperience ;p
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Now I'm pretty darn sure of my components.
My Cave Dweller worked before I added the taptation, so I'm guessing it must be the taptation board.
The Cave Dweller layout has a 5.1k resistor coming from pin 6 of the PT2399, should I be connecting that resistor to where the taptation is supposed to go to pin 6?
Quote from: brand0nized on August 08, 2014, 11:01:29 PM
Now I'm pretty darn sure of my components.
My Cave Dweller worked before I added the taptation, so I'm guessing it must be the taptation board.
The Cave Dweller layout has a 5.1k resistor coming from pin 6 of the PT2399, should I be connecting that resistor to where the taptation is supposed to go to pin 6?
i would put it in between pin 6 and the resistor, or directly to pin 6.
Just to clarify, I meant that I took out the resistor when implementing the taptation so I could connect the board straight to pin 6, so now I'm wondering if that resistor needs to be put back in between pin 6 and the taptation board
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I'd say so. Nothing mentioned removing it. It could be vital.
Hi,
I checked on the JMK PCB's taptation implementation guide and it says to not connect the resistor next to pin six and solder the wire directly onto the pin 6 of the PT2399. It also said to not connect the time pot.
Hope this helps
Joshua
P.S here's the link
jmkpcbs.com/wp-content/uploads/2014/03/Taptation-Implementation-Document.pdf
Thanks for checking, Joshua, I didn't realize the JMK doc mentioned the a Cave Dweller specifically. Well, that leaves me back at square one
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