Author Topic: String Ringer build.  (Read 37374 times)

dperry

Re: String Ringer build.
« Reply #100 on: October 02, 2020, 06:42:29 AM »
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

Re: String Ringer build.
« Reply #101 on: October 02, 2020, 06:49:44 AM »
Looks like I used 1M in my build...
Prog bass player. Bleep bleep.

Jeeper2000

Re: String Ringer build.
« Reply #102 on: October 05, 2020, 08:10:43 PM »
Iím 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. Iíve 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. Iíve looked for solder bridges and cold joints and canít figure this one out. Iíve found a couple other posts where people had similar issues with the square wave dropping out, but they had other issues Iím not. Has anyone else run into this?

dperry

Re: String Ringer build.
« Reply #103 on: October 25, 2020, 08:07:12 AM »
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

Re: String Ringer build.
« Reply #104 on: October 25, 2020, 08:12:10 AM »
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.
« Last Edit: October 25, 2020, 08:15:41 AM by ficelles »
Prog bass player. Bleep bleep.

dperry

Re: String Ringer build.
« Reply #105 on: October 25, 2020, 08:27:24 AM »
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

Re: String Ringer build.
« Reply #106 on: October 25, 2020, 08:29:06 AM »
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?
Prog bass player. Bleep bleep.

Ry

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Re: String Ringer build.
« Reply #107 on: October 25, 2020, 10:08:46 AM »
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

Re: String Ringer build.
« Reply #108 on: October 25, 2020, 10:41:06 AM »
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  ;D ;D ;D

pacealot

Re: String Ringer build.
« Reply #109 on: April 27, 2021, 01:35:15 PM »
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.
"Stupidity has a certain charm - ignorance does not." ó Frank Zappa

lvckv

Re: String Ringer build.
« Reply #110 on: May 20, 2021, 01:42:59 PM »
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

Re: String Ringer build.
« Reply #111 on: May 20, 2021, 01:54:04 PM »
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  ;D

https://www.taydaelectronics.com/potentiometer-variable-resistors/cermet-potentiometers/3296w/100k-ohm-trimmer-potentiometer-cermet-25-turns-3296w.html
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for an amount of Ďup to and including my life.í

lvckv

Re: String Ringer build.
« Reply #112 on: May 20, 2021, 02:54:56 PM »
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

Re: String Ringer build.
« Reply #113 on: May 20, 2021, 02:57:25 PM »
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  8)
A Veteran is someone who, at one point in his or her life, wrote a blank check made payable to The United States of America
for an amount of Ďup to and including my life.í