String Ringer build.

[dperry]

Hi guys,

I just bought this PCB, so trying to get the order together.  Regarding R3 - its listed as 100k-1M, pardon my ignorance, but does that mean anything between those values?

[ficelles]

Looks like I used 1M in my build...

[Jeeper2000]

I'm trying to troubleshoot the V1.3 I etched a couple years ago. It works like a charm except for the square wave section of the VCO. The sound drops out heavily when I switch to it. I've checked the transistor and resistors in that portion of the circuit and the components all seem to test fine. When I used my audio probe on it I have sound until after the 15k R22. I've looked for solder bridges and cold joints and can't figure this one out. I've found a couple other posts where people had similar issues with the square wave dropping out, but they had other issues I'm not. Has anyone else run into this?

[dperry]

Hi all.

Im having some trouble debugging this (looks like common issue with the build!) I've got the DeadEnd FX 2018 red pcb.

All LEDs work and pressing the switches i get following results.

Bypass switch - slightly thins out guitar signal

Bypass and octave/osc switch on - oscillator tone that is tunable with the VCO knob and blend control goes between dry and VCO (fully clock = VCO only etc)

Bypass/octave + Osc/Lock switch all on - oscillator tone with variable pulses controlled by rate and depth knobs.

so it seems that the dry signal isnt getting ring modded at all.  I've checked over my daughterboard and dont see any issues.

I am only running in and out and vco jacks, the carrier and depth LFO have been shorted.

I also took these readings.

IC1 - NE5532
1 - 3.9
2 - 3.9
3 - 3.9
4 - 0
5 - 3.8
6 - 3.6
7 - 3.6
8 - 7.9

IC2 TL074
1 - 4.6
2 - 4.6
3 - 4.6
4 - 9.3
5 - 4.6
6 - 4.6
7 - 4.6
8 - 4.6
9 - 4.6
10 - 4.6
11 - 0
12 - 4.6
13 - 4.6
14 - 4.6

IC3 TL074
1 - 4.6
2 - 4.6
3 - 4.6
4 - 9.28
5 - 4.4
6 - 6.9
7 - 1.5
8 - 7.4
9 - 4.6
10 - 4.6
11 - 0
12 - 4.6
13 - 4.6
14 - 4.6

IC4 TL074
1 - 4.6
2 - 4.6
3 - 4.6
4 - 9.28
5 - 4.3
6 - 6.9
7 - 1.5
8 - 7.4
9 - 4.6
10 - 4.6
11 - 0
12 - 4.6
13 - 4.6
14 - 4.6

any pointers in the right direction?

[ficelles]

I'm sure you've done this, but did you turn up the drive control? If it's at zero you won't get any ring mod sounds...

And just remembered, I used pins and sockets for my daughterboard mounting and wasn't getting a good connection initially so I ended up soldering it in, you can check by holding the daughterboard in place.

[dperry]

Yeah, just tried that.... same problem.

Just to clarify the daughter board...the 4 inner headers are for circuit connection and the 4 outer are for support...is that correct? i've shorted the inner and outer on each leg

[ficelles]

Just to clarify the daughter board...the 4 inner headers are for circuit connection and the 4 outer are for support...is that correct? i've shorted the inner and outer on each leg

I think so but maybe someone can confirm?

[Ry]

Yes, I believe that the inner pads are connections for the circuit and the outer pads are for board mounting, they should not be shorted together.  I had some issues with that in my build as well.

[dperry]

Played around a bit more with the daughter board and....ITS WORKING!

I hadnt properly connected the inner and outer pads on the board.

It sounds gross! My Mrs hates it already 

[pacealot]

A bit of a bump for a question before I act upon a faulty assumption. I'm assembling one of these now from the same DeadEnd FX PCB board kit pictured. I'm assuming that the tabs on the LT44 transformers need to be clipped off before installing them, or else they will short out to the inner pins on the daughterboard which pass the signal. Is that what everyone else here has done, and/or did anyone else's troubles result from those pins making contact with the transformer casings? The geometry of it all looks a little dicey, so I want to proceed carefully before installing (and potentially bodging up) these trafos, as they are so difficult to get here in the States.

[lvckv]

Have everything for this (DeadEndFX) except the B100K trimpot for the daughterboard.

Can't seem to find them anywhere? Only B100K potentiometers or 100k trimpots..

[Govmnt_Lacky]

Have everything for this (DeadEndFX) except the B100K trimpot for the daughterboard.

Can't seem to find them anywhere? Only B100K potentiometers or 100k trimpots..

Almost ALL trimmers are Linear (B) taper.

Just make sure to get the correct package type as listed in the build document (in this case... the 3296W style)

Tayda has almost 400K available for you to buy 

https://www.taydaelectronics.com/potentiometer-variable-resistors/cermet-potentiometers/3296w/100k-ohm-trimmer-potentiometer-cermet-25-turns-3296w.html

[lvckv]

Ah, thanks.

The build doc I have doesn't mention a specific type that I can see? Just lists TRIM-B1 - B100K - TRIMMULTI. What are you reading to see 3296W?

[Govmnt_Lacky]

What are you reading to see 3296W?

The exact part number is not listed however, the footprint of the trimmer suggests that it is the 3296W 

[shaawano]

Quick question, should the audio transformer connect with the inner pins of the daughter board headers, or should it be insulated from them?

[PMowdes]

No

[dperry]

So mine has broken down

It now acts a distortion pedal - not the lovely octave fuzz, just a distortion.

The VCO output seems to have died.  Does anyone have the Markus K orignal build document? The Dead Astronaut build doc has a very hard to read schematic which is not helping me at all

[Bucket]

What are you reading to see 3296W?

The exact part number is not listed however, the footprint of the trimmer suggests that it is the 3296W 

Could you help me with the other two trimmers? I'm quite new to all this and just setting up a source list for when I attempt to tackle this (after a few other pedals on the workbench).

I'm assuming this is a fit for the 1k https://www.taydaelectronics.com/1k-ohm-trimpot-variable-resistor-6mm.html but I'm not sure how to be sure. Googling around and searching eBay, Mouser, etc. for 1k Vishay trimmers hasn't gotten me very far.

As for the 100k, I've turned up these: https://www.mouser.com/ProductDetail/Amphenol-Piher/PT10LV10-104A2020-S?qs=pCZPOPZMYPi9fB5luKSZlA%3D%3D which look about right compared to the components footprint on the PCB. Is that correct?

[Govmnt_Lacky]

What are you reading to see 3296W?

The exact part number is not listed however, the footprint of the trimmer suggests that it is the 3296W 

Could you help me with the other two trimmers? I'm quite new to all this and just setting up a source list for when I attempt to tackle this (after a few other pedals on the workbench).

I'm assuming this is a fit for the 1k https://www.taydaelectronics.com/1k-ohm-trimpot-variable-resistor-6mm.html but I'm not sure how to be sure. Googling around and searching eBay, Mouser, etc. for 1k Vishay trimmers hasn't gotten me very far.

As for the 100k, I've turned up these: https://www.mouser.com/ProductDetail/Amphenol-Piher/PT10LV10-104A2020-S?qs=pCZPOPZMYPi9fB5luKSZlA%3D%3D which look about right compared to the components footprint on the PCB. Is that correct?

I believe the values for this build are 5K and 100K. You listed a 1K above which is not on the build document.

As for the 'type' of trimmer needed, you will need the type I listed before which is 3296W. Here are some Tayda links to what you need:

5K ohm trimmer: https://www.taydaelectronics.com/potentiometer-variable-resistors/cermet-potentiometers/3296w/5k-ohm-trimmer-potentiometer-cermet-25-turns-3296w.html
100K ohm trimmer: https://www.taydaelectronics.com/potentiometer-variable-resistors/cermet-potentiometers/3296w/100k-ohm-trimmer-potentiometer-cermet-25-turns-3296w.html

[Bucket]

What are you reading to see 3296W?

The exact part number is not listed however, the footprint of the trimmer suggests that it is the 3296W 

Could you help me with the other two trimmers? I'm quite new to all this and just setting up a source list for when I attempt to tackle this (after a few other pedals on the workbench).

I'm assuming this is a fit for the 1k https://www.taydaelectronics.com/1k-ohm-trimpot-variable-resistor-6mm.html but I'm not sure how to be sure. Googling around and searching eBay, Mouser, etc. for 1k Vishay trimmers hasn't gotten me very far.

As for the 100k, I've turned up these: https://www.mouser.com/ProductDetail/Amphenol-Piher/PT10LV10-104A2020-S?qs=pCZPOPZMYPi9fB5luKSZlA%3D%3D which look about right compared to the components footprint on the PCB. Is that correct?

I believe the values for this build are 5K and 100K. You listed a 1K above which is not on the build document.

As for the 'type' of trimmer needed, you will need the type I listed before which is 3296W. Here are some Tayda links to what you need:

5K ohm trimmer: https://www.taydaelectronics.com/potentiometer-variable-resistors/cermet-potentiometers/3296w/5k-ohm-trimmer-potentiometer-cermet-25-turns-3296w.html
100K ohm trimmer: https://www.taydaelectronics.com/potentiometer-variable-resistors/cermet-potentiometers/3296w/100k-ohm-trimmer-potentiometer-cermet-25-turns-3296w.html

Hm, now I'm even more confused 

The PDFs (1.2 and 1.3) both clearly list a 1k trimmer on the BOM and on the layout and it doesn't look like either of the trimmers you linked would fit. Am I looking at something different?