| Author |
[IN STOCK] L-1 Quad VCA/Mixer. (Assembly guide added) |
| L-1 |
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.
  
PCB with installed SMDs (both sides):
 
PCB (both sides):
 
Scope shots:
Fast triangle modulated by slow triangle, and slow triangle modulated by fast triangle::
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| Monobass |
Two full sets (pcb, panel, tempcos) but no soldering please  |
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| L-1 |
| I will solder tempcos then to don't lost them. |
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| Monobass |
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| mxmxmx |
| 1x pcb + tempcos , please |
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| sammy123 |
1 Total Full Set please.  |
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| L-1 |
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 |
| what is shipping for two sets of panel/pcb? |
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| L-1 |
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| rockwoofstone |
One full set please! Payment made...  |
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| sammy123 |
| 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.   |
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| cleahy |
| Ordered one full set including soldering and tempcos! |
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| cleahy |
| 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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| L-1 |
| 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 |
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 |
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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| L-1 |
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| Low-Gain |
| i'll take a pcb/panel/smt/tempco set for sure. just pulling cash together. |
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| cleahy |
| 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? 
Cheers! |
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| L-1 |
| 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?
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 |
| 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 |
| Hi! Sent a money. Great project! |
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| hsimonis |
Hi,
money sent for a complete set.
Helmut |
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| L-1 |
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.
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| cleahy |
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