[IN STOCK] L-1 Quad VCA/Mixer. (Assembly guide added)

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L-1
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[IN STOCK] L-1 Quad VCA/Mixer. (Assembly guide added)

Post by L-1 » Mon Sep 09, 2013 2:20 pm

Image

14HP

http://l-1.su/QuadVCA.html


Shopping carts http://l-1.su/QuadVCA.html#3

Assembly guide http://l-1.su/QuadVCA.html#1


I've tested today Serial No 0. Everything works perfecto!
So, i'm starting take orders.
Will upload all info on my site soon. Partslist is at the bottom of this post.

Pricing:

PCB - $30
Panels front+back - $30

SMD soldering - $15
Tempco resistors - $6

Shipping only PCB - $5
Shipping PCB+panels - $8

TOTAL full set with shipping - $89

paypal: info(at)greenexpo.by

This is hi-quality Quad VCA-Mixer. I used maybe best available VCA chips THAT2180 and OPA2604 in audio chain, TL074 for CV.
4 identical VCAs and mixer to mix channels in pairs and all together, each channel has separate out too.
VCAs feed both AC or DC sinnals.
Responce curve is in the middle between exponential and linear. Changing one resistor per VCA can change this curve if someone want.

Now I have limited amount of tempco resistors. For about 20 PCBs. But I've already ordered big butch of them, wait for them in a couple of weeks.
If someone doesn't want temperatutre compensation - don't pay for tempcos, I will install regular 2K resistors in their place.


ImageImageImage



Image




PCB with installed SMDs (both sides):
ImageImage


PCB (both sides):
ImageImage


Scope shots:
Fast triangle modulated by slow triangle, and slow triangle modulated by fast triangle::
ImageImage
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Last edited by L-1 on Sat Jan 25, 2014 1:51 pm, edited 6 times in total.
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Monobass
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Post by Monobass » Mon Sep 09, 2013 2:35 pm

Two full sets (pcb, panel, tempcos) but no soldering please :tu:
Thonk - CLICK HERE - Modular Synth DIY + Eurorack Accessories Store
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Post by L-1 » Mon Sep 09, 2013 2:39 pm

I will solder tempcos then to don't lost them.
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Monobass
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Post by Monobass » Mon Sep 09, 2013 2:41 pm

yeah that's fine thanks.
Thonk - CLICK HERE - Modular Synth DIY + Eurorack Accessories Store
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mxmxmx
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Post by mxmxmx » Mon Sep 09, 2013 2:57 pm

1x pcb + tempcos , please
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Post by sammy123 » Mon Sep 09, 2013 3:00 pm

1 Total Full Set please. :)
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L-1
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Post by L-1 » Mon Sep 09, 2013 3:14 pm

Please pay. First 20 PCBs which I have tempcos will ship next day after payment.
Others - or wait 2 weeks or don't order tempcos.

my paypal; info(at)greenexpo.by
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Monobass
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Post by Monobass » Mon Sep 09, 2013 3:43 pm

what is shipping for two sets of panel/pcb?
Thonk - CLICK HERE - Modular Synth DIY + Eurorack Accessories Store
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L-1
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Post by L-1 » Mon Sep 09, 2013 3:53 pm

$8 per set = 16
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rockwoofstone
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Post by rockwoofstone » Mon Sep 09, 2013 4:33 pm

One full set please! Payment made... :sb:
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sammy123
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Post by sammy123 » Mon Sep 09, 2013 5:02 pm

sammy123 wrote:1 Total Full Set please. :)
sent you a pm as I forgot to include my user name on my paypal order. Sorry about that. :doh: :oops:
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cleahy
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Post by cleahy » Mon Sep 09, 2013 5:47 pm

Ordered one full set including soldering and tempcos!
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cleahy
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Post by cleahy » Mon Sep 09, 2013 5:55 pm

cleahy wrote:Ordered one full set including soldering and tempcos!
What modifications would need to be made in order to make the response linear?
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Post by L-1 » Tue Sep 10, 2013 3:41 am

cleahy wrote:
cleahy wrote:Ordered one full set including soldering and tempcos!
What modifications would need to be made in order to make the response linear?

Just replace 150K resistors with 82K. They are one per VCA, 4 total.
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mig27
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Post by mig27 » Tue Sep 10, 2013 3:58 am

Does the full set also include jacks, pots, knobs, ICs and through-hole parts?

Or just the PCB, front panel, tempco and soldered SMD parts?

Thx


Michael
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L-1
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Post by L-1 » Tue Sep 10, 2013 4:03 am

This answer is correct:

Or just the PCB, front panel, tempco and soldered SMD parts?

but a backpanel too and shipping cost.
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Post by L-1 » Tue Sep 10, 2013 5:00 am

Photos:




ImageImageImage



Image
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Post by Low-Gain » Tue Sep 10, 2013 6:17 am

i'll take a pcb/panel/smt/tempco set for sure. just pulling cash together.
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cleahy
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Post by cleahy » Wed Sep 11, 2013 5:56 am

L-1 wrote:
cleahy wrote:
cleahy wrote:Ordered one full set including soldering and tempcos!
What modifications would need to be made in order to make the response linear?

Just replace 150K resistors with 82K. They are one per VCA, 4 total.
Excellent - thanks! Are you hand-soldering the SMT stuff? If so, would it be possible to request this modification?

Which components on the BOM come soldered if we have purchased the SMT soldered PCB (is it just all of the resistors)?

Finally, when do you expect to be shipping? :party:

Cheers!
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L-1
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Post by L-1 » Wed Sep 11, 2013 1:53 pm

cleahy wrote:
L-1 wrote:
cleahy wrote:
cleahy wrote:Ordered one full set including soldering and tempcos!
What modifications would need to be made in order to make the response linear?

Just replace 150K resistors with 82K. They are one per VCA, 4 total.
Excellent - thanks! Are you hand-soldering the SMT stuff? If so, would it be possible to request this modification?

Which components on the BOM come soldered if we have purchased the SMT soldered PCB (is it just all of the resistors)?

Finally, when do you expect to be shipping? :party:

Cheers!
I solder SMDs using an infrared oven. But yes modification is possible.
Will test 15V version soon.
I solder all the components which have 1206 or 0805 in 'package' column. They are all resistors and ceramic capacitors.

I alredy packed all paid orders and will ship tommorow morning.
I will stop your package for applying an modufication.
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cleahy
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Post by cleahy » Wed Sep 11, 2013 2:14 pm

L-1 wrote:I solder SMDs using an infrared oven. But yes modification is possible.
Will test 15V version soon.
I solder all the components which have 1206 or 0805 in 'package' column. They are all resistors and ceramic capacitors.

I alredy packed all paid orders and will ship tommorow morning.
I will stop your package for applying an modufication.
Wow, that's some amazing service - thanks!
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Girts23
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Post by Girts23 » Wed Sep 11, 2013 3:13 pm

Hi! Sent a money. Great project!
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hsimonis
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Post by hsimonis » Thu Sep 12, 2013 5:28 pm

Hi,

money sent for a complete set.

Helmut
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L-1
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Post by L-1 » Fri Sep 13, 2013 10:03 am

I made this modification requested by cleahy. Made linear response. So if someone else want, can make too.
But for audio signals is better to save logarithmic.

These are scope shots. Fast triangle is modulated with slow triangle. Log and linear responses in comparison.

ImageImage
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cleahy
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Post by cleahy » Fri Sep 13, 2013 11:12 am

Perfect! Thanks again.
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