24ch API SUMMING MIXER DR-2402

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ZekeProductions

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Jul 17, 2015
Messages
54
fragletrollet said:
Ninuz, that`s beautiful! :)

I have a few more questions regarding parts:
1uf electrolytics: BOM calls for "low essr". How low are we speaking here? A link to a suitable cap from Mouser`s  inventory would be appreciated.
The same applies to the "Audio" 470uF electro, again a link to a Mouser cap would be appreciated.

Is this a good choice for the bipolar electro? I see the lifetime rating of bipolars are way lower than ordinary polarized electro`s. Something to think about?
http://no.mouser.com/Search/ProductDetail.aspx?R=UEP1E220MEDvirtualkey64700000virtualkey647-UEP1E220MED

This one good for the 1000uf?
http://no.mouser.com/Search/ProductDetail.aspx?R=EEU-FR1V102virtualkey66720000virtualkey667-EEU-FR1V102


And a question regarding the chassis: the back-panel has 8 xlr-cutouts in addition to the power inlet. So,  send/return (4), main out (2) and... a second set of outputs from the aca/bo?

for the 470uf this was recommended to me:

http://www.mouser.com/Search/ProductDetail.aspx?R=EEU-FC1V471virtualkey66720000virtualkey667-EEU-FC1V471

I plan on getting the same 1000uf but maybe Ninuz has a better recommendation

 

ZekeProductions

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Jul 17, 2015
Messages
54
fragletrollet said:
Ninuz said:
Hi,
The Vishay from mouser is a Linear pot. For he volume pots in the mixer you will need Log Audio Pots and it was hard for me to find a dual ganged conductive plastic pot which I did att RS online.
Another reason I choose the Vishay pot is because its quite small and the space on the back plate on the front panel is quite narrow. Of course you could cut of some of the metal if you need more space. I think the Alpha you found is a bit big in size and you shouldnt go bigger than a 16mm if you want to fit it without modding the backplate.

For the pan pots you will need Linear pots.
I found these for the Pan which Im thinking about getting as they are center detended. The are dual ganged but I suppose you could just use 1 gang and ignore the other one.
http://capi-gear.com/catalog/product_info.php?cPath=50_131&products_id=446
At the moment in my mixer I have Alpha 16mm which works fine.
The 16mm Alpha are quite cheap and has a really well known feel.

ZekeProductions said:
fragletrollet said:
I`ve found these aswell:

http://www.reichelt.de/PO6S-LOG-1-0K/3/index.html?&ACTION=3&LA=446&ARTICLE=88253&artnr=PO6S-LOG+1%2C0K&SEARCH=PO6S-LOG+1%2C0K

Ninuz found and purchased these:

http://se.rs-online.com/web/p/potentiometers/5042728/?searchTerm=5042728&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B367D247C5E5C647B377D247C5E5C647B31307D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D3530343237323826

I`m guessing those are the only conductive plastic types so far? Probably the tightest tolerance?

I looked into these and I wanted to know what would be the difference/benefits between the dual 1k alpha-twain that I found in mouser and the Vishay pots fragletrollet mentioned that Ninuz found. From my very poor knowledge the differences that I can see are conductive plastic vs carbon, Linear vs Audio Taper and price difference  ($25.37 for the Vishay and $3.19 for the Alpha [tawain]).  I guess my question would be which one is better for this project?


Thanks

By the way, I think I will go for these for the pan-pots. Will go nicely with the level pots...

http://capi-gear.com/catalog/product_info.php?cPath=50_131&products_id=308

Where did you get your API knobs Ninuz?

Thanks for the clarification Ninuz, I understand now. The ones at RS are Audio log and the mouser is Linear log. That is what I was confused about. Funny how they have the same model number though.
 

Ninuz

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Joined
Sep 20, 2011
Messages
61
Should be fine. Just check diameter and spacing pitch so they fit the PCB.
Did you get the external box for the PSU board? If not I would recommend it as it gets to hot inside the rack case which can cause some problems. Also use shielded cable for as much cabling as possible. 

ZekeProductions said:
fragletrollet said:
Ninuz, that`s beautiful! :)

I have a few more questions regarding parts:
1uf electrolytics: BOM calls for "low essr". How low are we speaking here? A link to a suitable cap from Mouser`s  inventory would be appreciated.
The same applies to the "Audio" 470uF electro, again a link to a Mouser cap would be appreciated.

Is this a good choice for the bipolar electro? I see the lifetime rating of bipolars are way lower than ordinary polarized electro`s. Something to think about?
http://no.mouser.com/Search/ProductDetail.aspx?R=UEP1E220MEDvirtualkey64700000virtualkey647-UEP1E220MED

This one good for the 1000uf?
http://no.mouser.com/Search/ProductDetail.aspx?R=EEU-FR1V102virtualkey66720000virtualkey667-EEU-FR1V102


And a question regarding the chassis: the back-panel has 8 xlr-cutouts in addition to the power inlet. So,  send/return (4), main out (2) and... a second set of outputs from the aca/bo?

for the 470uf this was recommended to me:

http://www.mouser.com/Search/ProductDetail.aspx?R=EEU-FC1V471virtualkey66720000virtualkey667-EEU-FC1V471

I plan on getting the same 1000uf but maybe Ninuz has a better recommendation
 

Ninuz

Well-known member
Joined
Sep 20, 2011
Messages
61
I used mostly Pier APP992. Works and sounds nice:)


axl said:
Triyng to find all the part for starting this great project!
Anyone have a clue of where buy api knobs style??

Anyone have build these with pierpaolo's DOA?
 

ZekeProductions

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Joined
Jul 17, 2015
Messages
54
ZekeProductions said:
fragletrollet said:
I`ve found these aswell:

http://www.reichelt.de/PO6S-LOG-1-0K/3/index.html?&ACTION=3&LA=446&ARTICLE=88253&artnr=PO6S-LOG+1%2C0K&SEARCH=PO6S-LOG+1%2C0K

Ninuz found and purchased these:

http://se.rs-online.com/web/p/potentiometers/5042728/?searchTerm=5042728&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B367D247C5E5C647B377D247C5E5C647B31307D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D4245522677633D4E4F4E45267573743D3530343237323826

I`m guessing those are the only conductive plastic types so far? Probably the tightest tolerance?

I looked into these and I wanted to know what would be the difference/benefits between the dual 1k alpha-twain that I found in mouser and the Vishay pots fragletrollet mentioned that Ninuz found. From my very poor knowledge the differences that I can see are conductive plastic vs carbon, Linear vs Audio Taper and price difference  ($25.37 for the Vishay and $3.19 for the Alpha [tawain]).  I guess my question would be which one is better for this project?


Thanks

I spoke with mouser today and they clarified that their was an error on the page. The part that I posted in the comparison is actually an Audio Taper, the mouser webpage was wrong. They will report the webpage for correction.

Here is the part at mouser.

http://www.mouser.com/ProductDetail/Vishay/P9A2R100FISX1102ML/?qs=%2fha2pyFaduj5EYn41UZWkFYdBorExN%2f%252bVqEvRsJSRBoziifoUjcBuA%3d%3d
 

ZekeProductions

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Joined
Jul 17, 2015
Messages
54
I see some people have used terminal blocks for the channel board (BUS & +/-16v) and the 2-ACA-BO boards (see attached pic). Does anyone know the pitch length for these? I am pretty sure it is 3.96mm but I can't seem to find any on mous*r.com or Farn*ll

will these fit?
http://www.mouser.com/Search/ProductDetail.aspx?R=284392-3virtualkey57110000virtualkey571-284392-3

 

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Le Roux

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Apr 30, 2008
Messages
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Canada
My mouser cart is up to $1100US and that doesnt include board/case costs, ACA board and transformers, or the 2520's.

All said and done, I'm thinking I will be over $3k Canadian.
 

JessJackson

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Dec 17, 2009
Messages
437
Location
Los Angeles
Le Roux said:
My mouser cart is up to $1100US and that doesnt include board/case costs, ACA board and transformers, or the 2520's.

All said and done, I'm thinking I will be over $3k Canadian.

my mouser cart is way less..

you have to check to see if its cheaper to buy 100 than 24 of certain items because it can be the difference between 0.20c and 0.02cents
 

Le Roux

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Messages
282
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my mouser cart is way less..

you have to check to see if its cheaper to buy 100 than 24 of certain items because it can be the difference between 0.20c and 0.02cents
[/quote]

Thanks for the tip! :) I will be sure to check that!!
 

fragletrollet

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Sep 19, 2010
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Oslo
So can anyone tell me about the feel of the Bourns pots from the BOM (for the mono channels level) :

http://no.mouser.com/Search/ProductDetail.aspx?R=91A1A-B24-D10Lvirtualkey65210000virtualkey652-91A1A-B24-D10L

I`ve used conductive plastic pots in the Bluzzi`s 1084 builds:

https://www.digikey.no/product-detail/en/bourns-inc/91A1A-B24-B15L/91A1A-B24-B15L-ND/1089381

and am not happy about the "feel". Way too light to turn. I`d like something along the feel of the CAPI T-PAD.
I talked to Jeff from Capi, and he advised me these:

http://capi-gear.com/catalog/product_info.php?cPath=50_131&products_id=227

However he will not restock them, and I have to save more money before I can purchase the next round of parts. Jeff also mentioned the BI-pots, that are much cheaper and have a similar feel. However he does not stock the 1k value.

...so, any tips?
 

Rob Flinn

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Sussex, UK
use the Bournes pots because they are really good quality.    Split a rubber grommet in half & put it on the shaft behind the knob so it creates a bit of friction between the knob & the panel.
 

buckethead

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Nov 15, 2011
Messages
113
Location
Austria
Hi guys!

I'm building one of those too and have almost all the parts ready by now. Total cost I'd say 2000-2500€

How did you guys mount the LEDs? Still thinking of a good way to solve that problem...

Best regards,
Mathias
 

Ninuz

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Sep 20, 2011
Messages
61
I used epoxy glue.
Same for the framing of the Sifam meters I used as the mounting set/bolt and nuts didnt fit.


buckethead said:
Hi guys!

I'm building one of those too and have almost all the parts ready by now. Total cost I'd say 2000-2500€

How did you guys mount the LEDs? Still thinking of a good way to solve that problem...

Best regards,
Mathias
 

buckethead

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Nov 15, 2011
Messages
113
Location
Austria
Ninuz said:
I used epoxy glue.
Same for the framing of the Sifam meters I used as the mounting set/bolt and nuts didnt fit.

So you glued the LEDs and the meters directly to the frontpanel? I was thinking about that too...but I'm not giving up trying to find a "nicer" way to mount those ;)
 
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