[IN STOCK] L-1 VC ADSR, Mouser cart added, page 5.

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L-1
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Post by L-1 » Tue Oct 27, 2015 12:42 pm

Seems to LM13700 slightly vary in offsets and gain. Mine got exact 5V with 255K.
I will include 249K and 261K to give possibility to trim that gain more precise.

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Post by sammy123 » Sun Mar 20, 2016 10:09 am

I'm having some issues achieving long decay and release times. My voltages look good, but is there anything else to check?

I can only get a couple seconds.

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Post by fragletrollet » Sun Mar 20, 2016 10:19 am

Not sure if I did something wrong when putting this thing together, but gate 1 is always normalled to gate input two, even when inserting jack into gate 2. Maybe my jack receptacle for gate 2 is broken somehow?

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Post by sammy123 » Sun Mar 20, 2016 10:47 am

My gate 2 is not normalled to my gate 1. My trigger 2 is normalled to my trigger 1.
fragletrollet wrote:Not sure if I did something wrong when putting this thing together, but gate 1 is always normalled to gate input two, even when inserting jack into gate 2. Maybe my jack receptacle for gate 2 is broken somehow?

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Post by sammy123 » Sun Mar 20, 2016 5:52 pm

I just can't figure this one out. I had a mis-packaged 3.9n cap in the 2.2n slot, but that didn't change anything. Swapped some TL072s, but they are all from same batch and nothing changed. I also swapped Lm37000 with a chip from a different batch. I only have 2 that 340Ps so I can't check that one.

I am getting 10v and -10v on the LM4040s, which I believe to be correct. I don't know what to check specific to release and decay times though.

I believe my switches are having an effect.

Any help would be appreciated.
sammy123 wrote:I'm having some issues achieving long decay and release times. My voltages look good, but is there anything else to check?

I can only get a couple seconds.

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Post by L-1 » Mon Mar 21, 2016 2:15 pm

Yes, gates and triggers are normalled from 1 to 2.

Check voltages at Dec and Rel pots. Must be + - 10V at the edges.

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Post by fragletrollet » Mon Mar 21, 2016 3:35 pm

Mine responds to both gate 1 and gate 2 if both cables are inserted... surely it (gate 2) should just respond to gate 2 input (when both inputs used)?

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Post by woodster » Mon Mar 28, 2016 10:27 am

I finally had the time to build this.
It's a pretty full on build, but well worth it.
Really nice module.

Image

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Post by sammy123 » Mon Mar 28, 2016 10:34 am

Congrats woodster.

I'm jealous..still can't get mine working.

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Post by woodster » Mon Mar 28, 2016 11:12 am

sammy123 wrote:Congrats woodster.

I'm jealous..still can't get mine working.
Cheers Sammy,

What's the issue with your build?
Got any photo's of the pcb ?

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Post by sammy123 » Mon Mar 28, 2016 11:50 am

I can't get delay and release times longer than a second or so. It was driving me nuts so I had to walk away from it for a while. I can post some photos after work. Thanks woodster.

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Post by sammy123 » Mon Mar 28, 2016 12:25 pm

Woodster, if you have time could you maybe check your voltages for all pins of the pots. According to Aleksei there is nothing but traces between the 10v shunts and the pins of the pots....but I'm getting some odd voltages I think. I don't have it in front of me, but here are the voltages with the pots clockwise and counter-clockwise. No gate applied, just powered on.

Att1 CCW: -6.7/10/10 cw: -6.5/-6.5/10
Att2 CCW: -6.7/10/10 cw: -6.5/-6.5/10

Dec1 CCW: -5/10/10 cw: -5/-5-10
Dec2 CCW: -5/10/10 cw: -5/-5-10

sus1 CCW: 10/-10/-10 cw: 10/10/-10
sus2 CCW: 10/-10/-10 cw: 10/10/-10

Rel1 CCW: -5/10/10 cw: -5/-5/10
rel2 CCW: -5/10/10 cw: -5/-5/10


My lm4040-10 shunt voltages are looking at the back of the board. Going left to right here is the voltage from the top of the board down:
-10/0/0
0/10/0

0/10/0
0/0/-10

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Post by Multi Grooves » Wed Apr 13, 2016 1:51 pm

error post
...but Cynthia, my Daddy never had a heath kit..

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Post by samuraipizzacat29 » Wed Apr 13, 2016 1:59 pm

I saw your post that was supposed to be a private message in my inbox before it got deleted here.

Errors listed above are due to components or builder error. There are no flaws in this or any of the other L-1 designs. This isn't the easiest build, but isn't the hardest either. There are a lot of components, a lot of solder joints, and therefore a lot of things that can go wrong.
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Post by Multi Grooves » Wed Apr 13, 2016 2:14 pm

I wasn't suggesting flaws in the design. I'm more concerned about the possibility that the seller may have made an error. I don't have any meters of any kind so cannot test anything. I fear it'd take me a long time to spot a build error. I know you can't be a mind reader but would you take the chance?


TIA
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Post by samuraipizzacat29 » Wed Apr 13, 2016 3:08 pm

A flaw in the design is an error :despair:

You will need at least a digital multi-meter (volt meter) to calibrate this ADSR. A multi-meter is also absolutely essential for troubleshooting.
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Post by Multi Grooves » Wed Apr 13, 2016 3:52 pm

Not sure I'm being clear. There is one I was considering on the bay but looking at some the posts here I was fearful of the potential that the particular build may have had an error. Not really interested in DIYing (time) hence my questioning, same reason I'd rather not invest in in potentiometers/digital readers- feels like a bit of buzz killer if I'm having to measure everything out of the box....Unless this is something everyone else does?
...but Cynthia, my Daddy never had a heath kit..

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Post by samuraipizzacat29 » Wed Apr 13, 2016 6:49 pm

if you're talking about the one from perfect circuit audio, I'm fairly certain it was either assembled by aleksei or by one of their knowledgeable staff. In either case, it should come calibrated out of the box.

Yet, you should still possess the tools and ability to properly calibrate your modules to have them function as intended. Many of the VCOs I've owned required near constant calibration.
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Post by fragletrollet » Thu Apr 14, 2016 12:49 am

fragletrollet wrote:Mine responds to both gate 1 and gate 2 if both cables are inserted... surely it (gate 2) should just respond to gate 2 input (when both inputs used)?
Is this just on mine?

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Post by L-1 » Sat May 14, 2016 7:25 pm

fragletrollet wrote:
fragletrollet wrote:Mine responds to both gate 1 and gate 2 if both cables are inserted... surely it (gate 2) should just respond to gate 2 input (when both inputs used)?
Is this just on mine?
Gate 2 is just normalled to jack's switched pin from Gate 1. Nothing else there. When you feed a cable to Gate 2 in, then a cable disconnects this pin.

Check your cables at first.

Can't imagine what can happens there. Switched pin not disconnects (?) It's impossible I think.

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Post by fragletrollet » Sun May 15, 2016 2:20 am

Check the cable? Why would the cable be a factor in this?
If anything, I`d think it would be the switching of the jack that is broken somehow? I can make a video in a few days once I get ahold of a camera, might better explain what`s going on.

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Post by L-1 » Sun May 15, 2016 5:12 am

[video][/video]

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Post by livefreela » Fri May 20, 2016 6:08 am

sammy, did you ever get this straightened out? i'm having a similar problem with the same readings at the pot pins (except attack, those are at -5v+10v as well)
sammy123 wrote:Woodster, if you have time could you maybe check your voltages for all pins of the pots. According to Aleksei there is nothing but traces between the 10v shunts and the pins of the pots....but I'm getting some odd voltages I think. I don't have it in front of me, but here are the voltages with the pots clockwise and counter-clockwise. No gate applied, just powered on.

Att1 CCW: -6.7/10/10 cw: -6.5/-6.5/10
Att2 CCW: -6.7/10/10 cw: -6.5/-6.5/10

Dec1 CCW: -5/10/10 cw: -5/-5-10
Dec2 CCW: -5/10/10 cw: -5/-5-10

sus1 CCW: 10/-10/-10 cw: 10/10/-10
sus2 CCW: 10/-10/-10 cw: 10/10/-10

Rel1 CCW: -5/10/10 cw: -5/-5/10
rel2 CCW: -5/10/10 cw: -5/-5/10


My lm4040-10 shunt voltages are looking at the back of the board. Going left to right here is the voltage from the top of the board down:
-10/0/0
0/10/0

0/10/0
0/0/-10

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Post by L-1 » Fri May 20, 2016 6:16 am

These readings are correct. I written wrong above , sorry.

Decay and Release times depend on Sustain level. The longest Decay is possible when Sustain is at min, the longest release is possible when Sustain is at max.
This is constant slope envelope. please watch the video.

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Post by sammy123 » Fri May 20, 2016 6:34 am

Livefreela. I have not looked at it. I figured it would be best to come back to it later.

Also, my inputs are not linked either..

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