Resonant Lopass Gate PCB's (New Batch 4/29/12)

[sduck]

Thanks - that's more or less what I remembered, I just wasn't sure. I did go ahead and monkey with the settings, and ended up with them about where they were originally - it didn't seem to make a huge difference where I set the things. These things are alive - each one responds differently to what's coming in to it - it's almost impossible to get them even in the ballpark similar.

[Junk Rhythm]

Allied currently has the VTL5C3 discounted to $2.30 each due to an overstock. Might be a good time to pick up parts for your boards or to even stock up for future modules.

[numbertalk]

Nice! Thanks for this tip! Too bad I recently ordered a few of these but just picked up several more for my stock.

[parasitk]

[Spratty]

I've recently been inspired enough to populate most of the pcb for this project So far so good...

I was wondering if someone could give me an indication of what sort of current draw we're looking at for one of these?

Regards,
Spratty

[valis]

I'll take one please!

-David in Oregon USA

[helitron]

hi, i have built mine and i am running at 12v. I really like the sound of the filter, it's really great - however i seem to have a problem with the resonance. It sounds quite overdriven and harsh. i had a look ar the waveform in selfresonance and it gives me kinda "hunchback-" sines .
is this normal, or is it just me with my 12V system.

cheers, hel

[djthomaswhite]

The resonance can really get rugged. I show that in one of my youtube videos (the 3rd one in sequence). I'd give that a listen and see if it sounds similar to what you've got going. I find a little resonance goes a long way in this design.

Hope this helps!

Thomas

[helitron]

Thanks Thomas,
Sounds similar.

hel

[dave_3283]

So I got the first of two of these wired up tonight. I'm experiencing two problems.
1. The resonance knob does nothing.
2. The Amp/Both/Filter switch works on Filter and Both, but does nothing on Amp. When the offset knob is set to 12 o'clock, you can hear what sounds more like bleed than modulation, but it rapidly disappears when the pot is moved to either extreme.

What it DOES do, so far, I like a great deal. Just need some help troubleshooting...

[lexvortex]

I just read the subject line in the header of this thread and I'd definitely be in for 4 PCBs if there is another run! I'm still kicking myself for not getting in on the first run

Cheers,
Dave

[djthomaswhite]

dave_3283,

I'd double check your switch wiring and any wiring in general. If all the components are soldered correctly wiring is the likely cause. Did you solder the pots to the board or fly them off with wires?

Thomas

[dave_3283]

In the back of my mind, I've always thought it could be the 3p switch. With 9 pins, it wouldn't be that hard to have them rotated 90 degrees.

The pots have flown off the board.

[dave_3283]

Damn if you weren't right. The switch pinout is 90 degrees from the throw of the switch. Doh. It seems like I've got one dumb thinkg like this on every project...

[djthomaswhite]

Great news Dave! Are you happy with the results of the circuit now that all works okay?

Thomas

[dave_3283]

I am once I adjusted the trimmer. At first, when switched to Filter mode, the resonance was still present even with the res knob all the way down, but turning the trimmer seemed to help. Great board- I'm excited to get the second one up and running now.

[djthomaswhite]

Dave,

Good to hear that. The trimmer should only affect the frequency offset centering, but if it helped with the resonance I am glad. Post pics of your build if you can. I have only seen a few and have interest in seeing everyone's build. Thanks Dave!

Thomas

[LetterBeacon]

The subject description implies that there might be another run of these boards, I thought this was a one run thing? If there is another run I'd definitely be up for a couple of boards.

[pristak]

I finally finished one of mine. It worked first try.

It seemed like such a huge project when I first ordered it. But I tackled other projects in the meantime and this one was actually easy when I got to it. This is the first project I've finished where there was not even a partial kit involved. It's the first time I've order all the parts myself.

The documentation was great. The diagram of the switch was excellent. Looking at that before hand it seemed like it would be a problem, but once I got started I realized you had labeled everything very clearly.

Thank you for getting this project together. It sounds great. I will be showing it off at our Dallas Synth DIY meeting on Sunday. I'll take some pictures then. I have it housed temporarily in a MOTM 120 panel until the Bridechamber panels come in.

[The Bad Producer]

I too would be up for some boards if there was another run...

Here's hoping...

[TekniK]

last weekend did finaly build my dual LPG 'Nim' module,sounds great!

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[ach_gott]

I'm adding my voice to those looking for another board run... just saw that Bridechamber is going to run some panels so something tells me this is the start of a cascade of such requests.

[Spratty]

Hi guys.

I've got my first lpg going It sure can get rather nasty quickly with the resonance.

I have only one problem at this point that is driving me a little mad. Things seem to work, except for the deep mod. If I put my fingers across the pins I've mounted on it I get something I might call "deep" but the second I jumper it, it goes. I've also tried removing the pins and using a piece of wire, it just cuts the audio out.

Differences between the recommended parts:

51k resistor instead of a 50k
2.0n --> 2n2 5% (couldn't get 2...)
25k trimmer (couldn't find 20k)

Anyone have any ideas?

Spratty

[TekniK]

[Spratty]