Ken Stone LPG 1.0 panels anyone?

bkbirge · Post by **bkbirge** » Thu Jun 05, 2014 8:30 am

Hey all, has anyone done any panels for the new LPG from Ken Stone (and PlanB), LPG 1.0 ? This seems like a good project for a euro panel from Clarke or Grayscale or...? Does one exist already in euro?

Jonachi · Post by **Jonachi** » Thu Jun 05, 2014 10:04 am

I made my own last fall. Wasn't any around then.

fluxmonkey · Post by **fluxmonkey** » Thu Jun 05, 2014 4:12 pm

have you built/tested one? I have not been able to get consistent levels across modes, i believe the mode switch is not correct.

bkbirge · Post by **bkbirge** » Thu Jun 05, 2014 5:06 pm

fluxmonkey wrote:have you built/tested one? I have not been able to get consistent levels across modes, i believe the mode switch is not correct.

Not me, I'm not brave enough to build without a panel in hand and I have yet to design or make a panel. What's incorrect about the mode switch?

sempervirent · Post by **sempervirent** » Thu Jun 05, 2014 5:24 pm

Believe it or not, I actually designed a panel for this last week. PCBs have been ordered already, Ken is OK with the idea. I'm also talking with negativspace about doing a panel PCB to simplify wiring (and add a CV attenuator). I wasn't going to do an interest check until all of that was tested and ready to go, but here we are.

rezzn8r · Post by **rezzn8r** » Thu Jun 05, 2014 5:28 pm

Papoon?
http://www.firesigntheatre.com/papoon/

Thonk Support · Post by **Thonk Support** » Thu Jun 05, 2014 5:32 pm

fluxmonkey wrote:have you built/tested one? I have not been able to get consistent levels across modes, i believe the mode switch is not correct.

interested to hear more, It does seem it's had some people

bkbirge · Post by **bkbirge** » Thu Jun 05, 2014 5:32 pm

Sweet! Extra sweet with a daughter board. Mark me down for two.

widdly · Post by **widdly** » Thu Jun 05, 2014 7:40 pm

There is no schematic so it is hard to tell but all the lpg schematics I've seen use a 3pdt switch.

tony d · Post by **tony d** » Thu Jun 05, 2014 10:18 pm

sempervirent wrote:

Believe it or not, I actually designed a panel for this last week. PCBs have been ordered already, Ken is OK with the idea. I'm also talking with negativspace about doing a panel PCB to simplify wiring (and add a CV attenuator). I wasn't going to do an interest check until all of that was tested and ready to go, but here we are.

Looks awesome Wes except i think you made a mistake? Looks like you designed it for 1/8" jacks instead of bananas

sempervirent · Post by **sempervirent** » Thu Jun 05, 2014 10:31 pm

Haha, I know right? I worry that if I jump into 4U/banana DIY, I'll never jump out!

mxmxmx · Post by **mxmxmx** » Fri Jun 06, 2014 1:43 am

Monobass wrote:
fluxmonkey wrote:have you built/tested one? I have not been able to get consistent levels across modes, i believe the mode switch is not correct.
interested to hear more, It does seem it's had some people :hmm:

me too, i was too lazy to investigate but all my builds have issues with (i think it is) filter mode. the two other modes appear to be fine

arrmcbain · Post by **arrmcbain** » Fri Jun 06, 2014 6:19 am

I have the same problem with the Thomas White LPGs, I have only built two but they have very different behaviour/character in filter mode. One is super smooth and warm, the other is harsh and bitey. Not ideal in a dual module. I assumed I had screwed up one of the builds but maybe not... Could it be down to variability in the vactrols?

mxmxmx wrote:
Monobass wrote:
fluxmonkey wrote:have you built/tested one? I have not been able to get consistent levels across modes, i believe the mode switch is not correct.
interested to hear more, It does seem it's had some people
me too, i was too lazy to investigate but all my builds have issues with (i think it is) filter mode. the two other modes appear to be fine

negativspace · Post by **negativspace** » Fri Jun 06, 2014 9:41 am

Daughterboard =

I'm going to need a PCB and at least a printout of the panel for measurements... I have to order a couple more ResEQs from Ken as well so I'll see about picking up an LPG board along with 'em next week.

drip.feed · Post by **drip.feed** » Fri Jun 06, 2014 7:23 pm

Can you snap Ken's pcb in half? If not, how would you mount a 4U pcb behind a Euro panel? Please don't say perpendicularly.

djs · Post by **djs** » Fri Jun 06, 2014 7:36 pm

drip.feed wrote:Can you snap Ken's pcb in half? If not, how would you mount a 4U pcb behind a Euro panel? Please don't say perpendicularly.

yes- it was designed to be split

sempervirent · Post by **sempervirent** » Fri Jun 06, 2014 7:36 pm

Yes, check the section that begins with "Please note that these boards can be broken into two pieces" at http://www.cgs.synth.net/modules/lpg.html

negativspace I'll send over the files soon.

rockwoofstone · Post by **rockwoofstone** » Thu Jun 12, 2014 6:15 pm

I've had 2 pairs of these built up for months, just waiting for someone to do to a panel. Thanks Wes!

rockwoofstone · Post by **rockwoofstone** » Fri Jun 13, 2014 3:06 am

Wes, looking again at this, shouldn't there be 3 settings on the toggles? I.e. VCA, LPG, Filter

Maybe someone who has one of these operational could chip in...

negativspace · Post by **negativspace** » Fri Jun 13, 2014 5:57 am

^ Not sure on this circuit exactly, but yeah, that's usually how it works.

When I only use two labels for that function I do VCF on top, VCA on the bottom and then the middle position of the switch becomes intuitive because it's LPG mode, which is both VCF and VCA.

sempervirent · Post by **sempervirent** » Fri Jun 13, 2014 9:50 am

The docs say:
"The mode switch selects between VCA mode and Low Pass Gate mode."

No third mode is mentioned and the BOM calls for a DPDT center off switch, so doesn't that mean that the center position is muted? (Might explain the problems that mxmxmx and others mentioned.)

If this is the case, maybe this could be changed to an SPDT switch on the daughterboard, as I don't really see the utility of a mute position and when you want to rapidly switch between modes there will be a dead zone.

Also, my boards came in yesterday and I noticed a few discrepancies in the two halves, not sure if it's anything consequential but if people were noticing differences in the two halves of the circuit, maybe that's intentional. I think the Plan B Dual Timbral Gates module that's related to this board had two different timbres on purpose.

rockwoofstone · Post by **rockwoofstone** » Fri Jun 13, 2014 3:19 pm

Now I read the docs again, I think you're right - this board doesn't have a VCF only mode. In which case, the panel looks spot on!

Would be good if there was a schematic to check though...

LetterBeacon · Post by **LetterBeacon** » Tue Jun 17, 2014 3:51 am

If it behaves like a normal LPG (which I believe it does), the centre position is 'both' mode.

The difference in levels between modes is also normal, I believe.

rockwoofstone · Post by **rockwoofstone** » Tue Jun 17, 2014 3:56 am

LetterBeacon wrote:If it behaves like a normal LPG (which I believe it does), the centre position is 'both' mode.

The difference in levels between modes is also normal, I believe.

"Both" is LPG mode - the question here is about VCF mode, which the documentation doesn't mention at all.

LetterBeacon · Post by **LetterBeacon** » Tue Jun 17, 2014 4:00 am

It must be an oversight in the documentation. This LPG is a clone of the Plan B Model 13, which in turn is a clone of the Buchla Music Easel LPG, both of which have VCF, Both, VCA modes.

http://www.modularsquare.com/PlanB-Dual ... 3-s354.htm

MOD WIGGLER

MOD WIGGLER

Ken Stone LPG 1.0 panels anyone?

Ken Stone LPG 1.0 panels anyone?