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

sduck · Posted: Thu Nov 13, 2008 6:54 am Post subject:

Got my boards - they look great! I seem to recall the latest run of klee boards also having that white solder contact stuff - it was absolutely no problem to solder.

bugfight · Joined: Aug 02, 2007 Posts: 188 Location: Arlington, TX USA

got mine, thanks mucho.
now starts the race to see who can take the longest to build them...

crashlander42 · Joined: Oct 21, 2006 Posts: 292 Location: Orlando, FL (US)

Got my boards! Thanks!

numbertalk · Posted: Thu Nov 13, 2008 10:16 am Post subject:

Also talked to Scott at Bridechamber and sounds like he expects to have panels in before the end of the year.

a_guy_called_tom · Joined: Jun 21, 2008 Posts: 31 Location: mountains

Boards arrived in switzerland, looking great! thanks alot!

berfmurret · Joined: Nov 13, 2008 Posts: 2 Location: in your basement

i want 4 if you can spare them... looks like the 10 last PCBs have been spoken for.. but just in case... i want to hold a place in line... i PMd you.

toybox · Posted: Thu Nov 13, 2008 3:23 pm Post subject:

got my boards thanks!! Very Happy

scriptstyle · Joined: Jan 22, 2008 Posts: 250 Location: nj

thanks thomas they look great!!!

doctorvague · Posted: Fri Nov 14, 2008 8:55 am Post subject:

Arrived in New Mexico on the 14th. WOW - excellent job - these are superb. Great documentation also.
Nice words about Larry Hendry whose wonderful DIY spirit lives on.
Much appreciation Thomas!
Phil

XeNoN23 · Joined: Oct 06, 2007 Posts: 16 Location: AuStRiA

Boards arrived today in Austria....thanks a lot!!!

Phillip Jeffries · Joined: Aug 23, 2008 Posts: 15 Location: Black Lodge

mine arrived yesterday...resistors are in all 4 already Wink

thanks again!

Spratty · Joined: Oct 08, 2007 Posts: 43 Location: Australia

Cheers Mr White Smile

Arrived in Australia on Thursday, picked the packet up this morning Smile

Wonderful instructions and documentation too btw Smile

Cheers!
Spratty Wink

Tasmanian Alkaloid · Joined: Jun 29, 2008 Posts: 116 Location: Isle De Mort

Is anyone planning to use their own home-made vactrols (aka hairballs) in this circuit?

doctorvague · Posted: Sat Nov 15, 2008 6:22 am Post subject:

LektroiD · Posted: Sat Nov 15, 2008 7:11 am Post subject:

norman phay · Posted: Sat Nov 15, 2008 8:33 am Post subject:

I got the package containing 4 boards today. Many thanks, Thomas.

TekniK · Joined: Aug 10, 2008 Posts: 1059

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helitron · Joined: Feb 27, 2008 Posts: 21 Location: vienna

thanks thomas, board arrived today

djthomaswhite · Joined: Nov 22, 2007 Posts: 140 Location: Orange, CA

Brainstormer,

Hang in there on the shipping. People from Israel are getting boards before people from Chicago. Germany had PCB's show up in 3 business days and France in 2. Delivery times are all over the map. Remember that shipping via First Class/Air Mail can take up to 10 business days. So far 5 have passed. Keep me, errr... "posted" on your postal arrival.

BTW, Some countries had a handful of packages all arrive at once (in customs) due to a larger number of orders from that particular country. All say "Commercial Sample" and some orders in the UK were quite large (up to 16 PCB's). I wonder if that is making customs folks think something fishy is going on?

TekniK,

That is one NICE panel!!! Really fits the Buchla origin... Are you going to silkscreen or FPE your panel? Can't wait to see the finished product,

Thomas

jksuperstar · Posted: Sat Nov 15, 2008 3:57 pm Post subject:

Boards received in Denver...looks great! Thanks!

Tasmanian Alkaloid · Joined: Jun 29, 2008 Posts: 116 Location: Isle De Mort

BananaPlug · Posted: Sun Nov 16, 2008 10:39 am Post subject: 1.5" frac layout

I think I'll build them as singles with banana plugs. Here's a sketch. They'll be black aluminum though. I'll be getting a bid on these from a metal shop I haven't tried before. Will let you know. Theoretically they can both fabricate the panel and laser the graphics.

Edit: Revised - better switch placement

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BananaPlug · Posted: Sun Nov 16, 2008 2:00 pm Post subject:

I got to thinking Ian Fritz's AD/AR would be a nice complement to the LPG. Something to form just the right CV to drive the LPG.

Edit: Revised - better switch placement

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djthomaswhite · Joined: Nov 22, 2007 Posts: 140 Location: Orange, CA

Mr. Banana,

You will find that a trigger or pulse only is frequently adequate to use with the LPG. The faster the Vactrol, the more need for an AD/AR/ADSR. For example:

VTL5C2 (corrected info) - middle of the road speed, between 5C3 and 5C4. Longer decay and a bit slower attack, although not as slow as the 5C4.

VTL5C3 - Fast, but natural Vactrol decay makes minimum response times long enough for use with trigger or gate alone

VTL5C4 - Slow, don't even think about VCA mode with this unless you want long decay times due to the Vactrol

All this is subjective and IMHO of course. What I find more useful is a gate to trigger converter with a control over the length of the outgoing pulse. Here's why: The pulse length acts as the "sustain" for the Lopass Gate circuit in relation to the decay time of the response. You see, Vactrols have an established opening time and an established decay time. Changing the length and amplitude of the trigger is VERY useful when looking for different responses from the Lopass Gate. That is why I recommend for all builders to have a CV input with an attenuator. Lower amplitude triggers will open the gate/filter less and can be used to dial in a certain response.

I'd build one Lopass Gate out and play around a bit before deciding on a final panel design. I have learned A LOT about LPG behavior in this whole PCB process and panel design and needs have changed both depending on the vactrol used and final intention of the module. One example would be that I could probably omit the mode switch with a VTL5C4 Vactrol entirely due to the effective use as a filter but not so effective use as a VCA. But, those who know me understand I won't omit anything usually so I don't have functionality regrets later on.

ericcoleridge · Joined: Jan 16, 2007 Posts: 889 Location: NYC