PYE Compressor/Limiter Thread *boards shipping* BOM up!

[Rob Flinn]

Thanks Patrick,

I am not sure if that is the latest diagram.  there is only one 52mH inductor on the pcb & current BOM where as this this circuit diagram has two.

 

[stevenclements]

from the AC Sound Pi-3141 Pre-Order (PYE Comp) 2nd Round!! PREORDER OPEN! thread...

Anthony has created a Mouser Project "cart" for a stereo pair based on Abe's BOM
http://www.acsoundstudio.com/diy/Pye/rev314/REV314_BOM1.pdf

ABE provided us with a link for the small knobs
Allied Electornics doesn't have an order history (drives me nuts) Here are the small ones:
https://www.alliedelec.com/search/productdetail.aspx?SKU=70097809

Aaron found these on Mouser
Smaller Knobs - http://ca.mouser.com/ProductDetail/Davies-Molding/1510AH/?qs=/ha2pyFadujrUgPg1/sA6O7cgb4nyXIT0wlO%2bgfqsYQ=
Larger Knobs - http://ca.mouser.com/Search/ProductDetail.aspx?Davies-Molding%2f1500AU-BLACK-LINED%2f&qs=sGAEpiMZZMuiwDVLTMm01ajIGS4kAMb6V0%2bTv0RgI2A%3d

I copied Anthony's cart & updated it to include enough knobs for a stereo unit
the cart is here - https://ca.mouser.com/ProjectManager/ProjectDetail.aspx?State=EDIT&ProjectGUID=21765FC6-F15D-4DA2-B601-0CF69821FEC6


Not added to the cart are these suggestions by Patrick
553-F117X Power Transformer - http://ca.mouser.com/ProductDetail/Triad-Magnetics/F117X/?qs=A0MODW4pnbT5S1q6Eo9XRQ==
693-6200.2100 IEC + Fuse drawer - http://ca.mouser.com/ProductDetail/Schurter/62002100/?qs=/0Eb3QIYuIav9VnbOIB16w==
568-NC3FD-L-1-B Female XLR Connector (2X) - http://ca.mouser.com/Search/Refine.aspx?Keyword=568-NC3FD-L-1-B
568-NC3MD-L-1-B Male XLR Connector (2X) - http://ca.mouser.com/ProductDetail/Neutrik/NC3MD-L-B-1/?qs=jCymNF74TgVYElHTaGE12w==

These are the meters we need... 8027-WF VU Meter
http://www.hairballaudio.com/shop/product_info.php?cPath=25&products_id=64

Transformers (Thanks Aaron -  Grummy77)
Iput - you need two for a stereo unit
Cinemag CMLI-15/15B http://cinemag.biz/line_input/line_input.php
Output - One of these
TTPC600/10K https://www.edcorusa.com/ttpc600-10k
or Two of these
TPC600/10K https://www.edcorusa.com/tpc600-10k



I was thinking that the inputs and outputs could be combo jacks...
http://www.neutrik.com/en/audio/plugs-and-jacks/jacks/combo-i-series/

...not sure if the effort is worth it... but sometimes it might be nice to just stick a TB-303 into it

 

[Grummy77]

Yeah Steve!

Thanks for compiling all that.
(This is Aaron by the way)

 

[prescott]

I'd like to use lundahl on the input and on the output.

Can someone help me please which trafos would fit in this circuit?

Thanks!

 

[Biasrocks]

Curious what the original ratios were for input/output transformers.

Step down on input, step up on output or 1:1, 1:1?

Anyone know??

Mark

 

[abechap024]

Curious what the original ratios were for input/output transformers.

Step down on input, step up on output or 1:1, 1:1?

Anyone know??

Mark

You need step up on output 1:2 or 1:4. Otherwise the signal is very quiet (like the originals) I've used stepdown on the input and they have worked fine. But 1:1 input is probably the best. Its in the BOM

 

[stevenclements]

for one stereo PYE compressor

Mouser Project Cart is updated to include Fuse drawer and XLR's

AC Sound PI-3141 Dual Channel Compressor MAY2014
http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=331ad05ac3
Price is $212 Canadian with shipping

Add to supplies from Mouser:

TWO 8027-WF VU Meter's
http://www.hairballaudio.com/shop/product_info.php?cPath=25&products_id=64

TWO Input Transformers - Cinemag CMLI-15/15B http://cinemag.biz/line_input/line_input.php
FOUR Output Transformers - TPC600/10K https://www.edcorusa.com/tpc600-10k

ONE uber hot case - http://collectivecases.com/pie.html


There I hope that's all the bits on one place
Cheers
Steve

 

[Patrick from Davis]

I think you need one more set of Edcor transformers for the sidechain.  So two Cinemag input transformers and four Edcor transformers for a stereo compressor. Fixed
Patrick

Addition: Hey Abe, if we just get the Edcors, you can wire them forward or backwards to get 1:4 or 4:1 right?  I only ask because if everything works fine that way, then we'd only need one part number and could buy in bulk.

 

[stevenclements]

I think you need one more set of Edcor transformers for the sidechain.  So two Cinemag input transformers and four Edcor transformers for a stereo compressor.
Patrick

Addition: Hey Abe, if we just get the Edcors, you can wire them forward or backwards to get 1:4 or 4:1 right?  I only ask because if everything works fine that way, then we'd only need one part number and could buy in bulk.

You're absolutely right... and I ordered 4 last night
The above post has been modified to reflect this

 

[Matt D]

How about this power transformer?

http://www.mouser.com/Search/Refine.aspx?Keyword=vpt-24

 

[Patrick from Davis]

That looks to be 12 parallel/24 volts in series on the secondary winding.  For a single channel unit, that would be fine in series.  For a stereo unit, I think you would want one that does 24/48 on the secondaries, so that there are two separate windings, one winding for each of the compressors.  Just to keep things separated.  That is what I thought Abe said a number of posts back.
Patrick

 

[Matt D]

How about this

http://www.mouser.com/ProductDetail/Triad-Magnetics/VPT48-520/?qs=sGAEpiMZZMvwUzoUXIIvyTw34uqMHR%252but33G0eT%252b6y4%3d

or this

http://www.mouser.com/ProductDetail/Triad-Magnetics/VPT48-1040/?qs=sGAEpiMZZMvwUzoUXIIvyTw34uqMHR%252budyV6EVq1EYo%3d

How much current does each unit draw?

 

[Patrick from Davis]

I believe he said it was very small, around 150 mA/compressor.  The first one (553-VPT48-520) would be more than enough at 1.0A in parallel wiring.  That would be a nice transformer because you could wire it for 115V or 230V on the primary side.
Patrick

 

[Matt D]

Oh well, I ended up ordering the second one.  Should do the job just as well I hope.

 

[sr1200]

http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=35cd91b9d8

I had done a Cart for this as well... the pots are split shaft, depends on what knobs youre using and a couple of the trimmers are a little small, but will fit... hope i did mine right, the cart is for a 2 channel build and only came to $137usd +shipping (i dont remember if i added i/o conectors on this either)  And i didn't include power transformer, so i guess that could make up the difference.

 

[Patrick from Davis]

I added it to my cart without logging in and it is ~$160 US.  There were knobs on the list, and I'm not sure if the transformer was added.  Anyways, it is not that much difference in price once it is in USD.
Patrick

 

[dogma]

I do mostly electronic music so mixing eurorack, elektron ect. Now how would the pie compressor work in an electronic mixing situation. I may be tracking and mixing some drums and gtrs but I'd be building it for mixing, 2 buss, drum buss. How would it be in that context?
I'd love to read a thorough user review

 

[sr1200]

Gotta find the Gearslutz page with the samples on it.  This this sounds insane on a 2bus from what I've heard (others that have either built em or heard em first hand).  Can't wait for the new boards to go out. ;D ;D ;D ;D ;D

 

[dogma]

Also is this a feed forward or feedback deal? I ask becUse the great river does both and then a blend of - the other pwm schematic does both. It's a very cool feature on the tonelux comp and I would love to have something like that as a possibility

 

[Patrick from Davis]

In this link, on page 10 or so, Abe explains it as a feedback compressor. 

Here is a link to the GS thread that has an example of it.
Patrick