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Level Lock 500 series

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Eliani

Well-known member
Joined
May 27, 2011
Messages
241
Location
Belgium
100DP1T1B4M7RE
100SP3T1B4M7QE

these are the switches I used, they are not often available, but most right-angled dpdt and spdt switches should do the job.
the footprint for an LL1528 transformer (or LL1935 in reverse) was put there in case people would like to use a low impedance input compared to the 50kOhm of the ina134. I'm sure you could wire in an original Shure microphone input transformer.
 

groselicain

Well-known member
Joined
Feb 9, 2009
Messages
181
Location
Tennessee
Oh, great idea - I've got a shoebox full of those bad boys as well, so I'll give that a go!
Be sure and report back on your findings. For now I went ahead and populated the board with the standard BOM, but I'd love to get as close to the sound of the original as possible.
 

Eliani

Well-known member
Joined
May 27, 2011
Messages
241
Location
Belgium
Thanks guys for the nice replies!!
I try to help everyone with building their level locks! So a couple of pointers…

- Don’t forget to jumper (jumper or wire)
UB-send to UB-send1
UB-in to UB-in2
UB-ret to UB-ret2
UB-out to UB-out2
These are points for switching/testing purposes. If you look at the schematics you’ll see that you could take the blend option out of the schematics.

- THAT chips are far more superior to original INA134/DRV134 chips.

- If you are using anything else then the original transistors be sure to have a look at the orientation and pinouts, i know for a fact that if you use BC550C’s they need to go in reverse oposed to the silkscreen footprints!!

- Be sure to check my ‘errata’ pictures because I messed up on two tiny places on the silkscreen!!
The names R11 and R2 did not get neatly placed, so they appear to be in each orthers footprint.
The names R42 and R43 did get neatly placed but got be switched around.
 

z11111

Member
Joined
Jan 1, 2021
Messages
19
Location
USA
Found some toggle switches on eBay from the same seller in China that will likely fit the footprint: SPDT and DPDT - measurements aren't great but are prob close enough? I found DPDT on-off-on and SPDT on-off-on from Farnell in the UK which look like they fit, and JLM in Australia has the on-off-on dpdt,

Haven't dug into Mouser or Digikey yet to see if there are any sources in the USA but found a drop in DPDT on-off-on from Newark here with the same footprint as 100DP1T1B4M7RE. Personally, I have tons of solder lug mini toggles like this so I'll probably just run wire leads from the pads.
 
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Aleguitarpro

Well-known member
Joined
Dec 28, 2011
Messages
156
Location
ITALY
Completed mine.
Is normal having a lot of hiss/noise with mix control at 100%?
I measured about -65dBu of noise with mix at 100% and input gain at "on".
Changes a little putting input gain at max.
I used ina134/drv134. Transistors listed on BOM.
Everything works as it should but there's this hiss/noise above 10khz.

Another thing I noticed is that is difficult to make an A/B before and after this processor because level is always lower compared to dry signal (is possible to compensate this with mix knob adding more dry signal to compressed) but I'm wondering if there's something strange in my build or this project works in this way.
When I put in bypass sounds always louder until I reach 9 o'clock on mix control (but at this point I'm listening the same uncompressed signal passing through the processor).
It's usable in tracking in my opinion but it's difficult to integrate in mixing due to this hiss and this discrepancy in levels.
I only have to know if this is normal or not.

Thanks for reading
 

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AllMixedUp

Active member
Joined
Nov 15, 2020
Messages
29
While I love the discussion, I'm wondering whether or not we should move this to the dynamics section. I know the original version had its own thread. We could either use that one or make a new one for Elianis boards.
 

Whoops

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Joined
May 9, 2008
Messages
5,688
Location
Portugal
While I love the discussion, I'm wondering whether or not we should move this to the dynamics section. I know the original version had its own thread. We could either use that one or make a new one for Elianis boards.

Yes this is a black market thread, it's for sale purposes, you will get more people involved in helping the project build if you do it in the proper section/thread
 

Aleguitarpro

Well-known member
Joined
Dec 28, 2011
Messages
156
Location
ITALY
I understand this is black market thread but I sent a private message to Eliani then I post this here.
I repost this question here:

Old thread about same project.
I only need that someone who already built this give me a feedback about the sound.
Eliani did a new layout and sold boards.
I posted here to understand if its layout is ok , is my build that has problems or the project is not so well thought.
 

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