Erica Synths SWAMP - the Wogglebug-inspired DIY module

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StudentsOfTheFuture
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Post by StudentsOfTheFuture » Thu Oct 12, 2017 5:37 pm

:banana:

This has gotten me to realize that mine works without a jumper on the 0-10 or the +/-5 sides... so that's a bit of a mystery.
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LeChaim
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Post by LeChaim » Mon Oct 16, 2017 2:28 am

oh – in the process i removed the jumper again on mine and didn't put it back yet. guess what, also works fine ;)

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needspeed
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Post by needspeed » Mon Oct 16, 2017 7:57 am

LeChaim wrote:oh – in the process i removed the jumper again on mine and didn't put it back yet. guess what, also works fine ;)
Awesome news and congratulations on the diagnostic work. Very odd that the trace was bad at this juncture. Hopefully just one defective board and bad luck you got one. I hope you enjoy the Swamp, as I think Girts really did a great job on this module and I love it......Steve
To a never ending journey of exploring all noise that may or may not be music to someone or anyone.

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LeChaim
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Post by LeChaim » Sun Oct 22, 2017 6:14 pm

really fantastic module and love to tickle the erica black wavetable with it – they really pair well together.

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needspeed
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Post by needspeed » Sun Oct 22, 2017 6:44 pm

LeChaim wrote:really fantastic module and love to tickle the erica black wavetable with it – they really pair well together.
I can imagine that to really be a great combo and the Swamp is up there as my favorite source of uncertainty.....Steve
To a never ending journey of exploring all noise that may or may not be music to someone or anyone.

bloc
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Post by bloc » Thu Dec 28, 2017 8:17 am

So how does this module hold up against the make noise wogglebug?
What is the difference between the swamp and tone osc?
Does it have some kind of burst gate out?

Im debating with myself (wogglebug mk2 or swamp :/ )

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NeolithicElectrophones
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Post by NeolithicElectrophones » Sun Mar 11, 2018 12:02 am

StudentsOfTheFuture wrote::banana:

This has gotten me to realize that mine works without a jumper on the 0-10 or the +/-5 sides... so that's a bit of a mystery.
Mine worked fine as well without it.Although, after putting the jumper on:the rate knob seems more sensitive and the led showing rate seems to be following a more linear path than it did before(maybe I'm just imagining it?).

Seriously loving this module. The stepped cv, extra tone outs and audio in were the main reasons it was a must purchase.

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oppositaer
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vactrolls

Post by oppositaer » Wed Nov 28, 2018 11:20 am

hello there!
i am also owner of a diy kit which is almost complete with all components collected from the mouser's BOM..

Only I found very annoying that those who wrote the BOM didn't specify Vactrol were to be taken separately(as they did instead with knobs and jacks specifications).. It is very subtle, I know, but I did the parts order without controlling each part to see if there was something missing..

So now I was wondering a couple of things to get the module ready to play in a couple of days:
1) make my own vactrol (very exciting option)
Does anyone have any advice on what leds/LDR should I use to match the specification of the VTL5C3 which is used on the BOM?
VTL5C3 Datasheet

2) find an alternative resistance instead of Vactrols or keep it unused
This option is even more interesting as I could tweak substantially the Swamp module, I am not an electronic genius and also have no schematic available but looking at the circuit the vactrol could be replaced in some way even with 1M pot or trim pot.. Another possibility I would try to solder wire jumpers instead of the LDR..
What do you think about? There any risk of damaging some components including the beautiful and misterious round IC??


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Post by sylvainmoreau » Sat Feb 16, 2019 5:11 pm

hi,

just finished my module and i'm not sure it's working ok.
i looked at synthguy video trying to match settings. i get same audio results so i assume all looks ok. But really for the CV ... i just can't understand what's really happening.
is there a test procedure described anywhere ?

for exemple i plug a cable from SWcv to an oscillator.
and moving SMOOTH RANGE afects the SWcv is that normal ?

setting all knobs to 0 and rate at 50% i expect to get 0v on SWCV... would that make sense from the manual i'm reading ? but it looks like i get +5 (almost)

anyway if you know a good video to CV 101 for swamp ? or do you think that if audio is ok then cv should follow ?

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gwpt
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by gwpt » Tue Dec 31, 2019 2:33 am

Hi,
Do all the DIY swamps suffer the transistor problem discribed on the previos page?
I'm juyst building one (just got it from thonk) and wondering whether I need to do the hack.

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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by Phitar » Wed Jan 01, 2020 10:18 pm

gwpt wrote:
Tue Dec 31, 2019 2:33 am
Hi,
Do all the DIY swamps suffer the transistor problem discribed on the previos page?
I'm juyst building one (just got it from thonk) and wondering whether I need to do the hack.
Built one about 2 years ago. It has no issues of any kind.
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Noodle Twister
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by Noodle Twister » Wed Jan 01, 2020 11:16 pm

Finished my build about 6 weeks ago. The pcb is marked Ver 1.2 June 2017.

Working well with no issues.

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Post by airfrankenstein » Wed Jan 08, 2020 2:23 am

bloc wrote:
Thu Dec 28, 2017 8:17 am
So how does this module hold up against the make noise wogglebug?
What is the difference between the swamp and tone osc?
Does it have some kind of burst gate out?

Im debating with myself (wogglebug mk2 or swamp :/ )

I've been asking myself the same question ? Anyone with both to comment ?

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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by skautkurt » Sun Jan 19, 2020 4:20 pm

As a little treat for myself, I ordered the partial kit for the erica synths bbd and the swamp :sb:
I just stumbled over one problem: Expensive Vactrols. 7€ for one hurts a bit if you need 3 of them.
What do the Vactrols on the Swamp do? I took a look at the schematic but am not quite getting it. Would it be possible to replace them with diy-d ones? Or is this idea really stupid (it possibly is :hihi: )
Cheers

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airfrankenstein
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by airfrankenstein » Sun Jan 19, 2020 6:01 pm

You certainly can diy, but you have to be sure to get the ldr with the proper resistance....

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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by Noodle Twister » Mon Jan 20, 2020 10:22 am

skautkurt wrote:
Sun Jan 19, 2020 4:20 pm
As a little treat for myself, I ordered the partial kit for the erica synths bbd and the swamp :sb:
I just stumbled over one problem: Expensive Vactrols. 7€ for one hurts a bit if you need 3 of them.
What do the Vactrols on the Swamp do? I took a look at the schematic but am not quite getting it. Would it be possible to replace them with diy-d ones? Or is this idea really stupid (it possibly is :hihi: )
Cheers
You can find them on Aliexpress. 5pcs for $5. However they can take 30-50 days to arrive.

I used a number of single machine pin sockets so that the vactrols can be removed/replaced if needed.

Looking at my build pics though I used xvive vactrols from Thonk. The Aliexpress one's are marked SR VTL.

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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by skautkurt » Thu Jan 23, 2020 5:06 pm

Thanks for the replies. I ordered some from ebay yesterday, will be here in a month or so. By chance, a friend told me he had some lying around, and he gave me to them, as he doesn't need them - so he gave them to me! He isn't quite sure which type they are, but they have the same markings as the ones you got from aliexpress, Noodle Twister. I measured the resistance of the ldr, and in the off state it was 10MΩ. Could I, by measuring the LED find out if they are the correct type?
I think I will also socket my vactrols, then I can swap them around.
Best

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Noodle Twister
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by Noodle Twister » Thu Jan 23, 2020 7:29 pm

Had a look at some different datasheets for VTL5C3 that both state 10MΩ for off resistance. I don't know if that confirms that they are VTL5C3 though.

https://www.farnell.com/datasheets/1498851.pdf

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BadPixel
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by BadPixel » Wed Feb 12, 2020 5:39 pm

Quick question about the switches; BOM states on-off-on. Do they have to be or would on-on work? Reason I’m asking is because markings on the front panel only shows two positions (sq-tri). Or is the middle position intended for turning the osc’s off?

TIA

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NeolithicElectrophones
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by NeolithicElectrophones » Wed Feb 12, 2020 6:29 pm

From the manual.

"WAVE switches select waveform on the TONE and SWAMP
audio outputs. The middle position of the switch give you
waveform that is crossfade between triangle and pulse"

Use the specified on-off-on if you want the crossfaded signal.

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BadPixel
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by BadPixel » Thu Feb 13, 2020 2:23 am

NeolithicElectrophones wrote:
Wed Feb 12, 2020 6:29 pm
From the manual.

"WAVE switches select waveform on the TONE and SWAMP
audio outputs. The middle position of the switch give you
waveform that is crossfade between triangle and pulse"

Use the specified on-off-on if you want the crossfaded signal.
Ah, thank you :hail: That would’ve been my second guess. Should have read the manual ofc, but didn’t get that far. Got stuck with the building docs :eek:

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Noodle Twister
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by Noodle Twister » Thu Feb 13, 2020 11:58 am

Also take a look at the pcb where the switches go. The distance between the pins is much smaller than the more commonly used ones.

From Thonk "NOTE: These are smaller than the more standard mini toggle switches. The pins are 2.54mm apart."

They are sub-mini switches available from Thonk

https://www.thonk.co.uk/shop/sub-mini-toggle-switches/

Just good to be aware of, I think I nearly ordered regular ones then realised they would not fit :oops:

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BadPixel
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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by BadPixel » Thu Feb 13, 2020 5:34 pm

Aye, I scoured the Intertubes for quite a while until I realized Farnell had them :doh: So I just moved some items from my Mouser cart there for passing the free shipping threshold :mrgreen:

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Re: Erica Synths SWAMP - the Wogglebug-inspired DIY module

Post by Noodle Twister » Sat Feb 15, 2020 4:40 am

BadPixel wrote:
Thu Feb 13, 2020 5:34 pm
Aye, I scoured the Intertubes for quite a while until I realized Farnell had them :doh: So I just moved some items from my Mouser cart there for passing the free shipping threshold :mrgreen:
Awesome :tu:

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