24ch API SUMMING MIXER DR-2402

Help Support GroupDIY:

Humner

Well-known member
Joined
Sep 22, 2012
Messages
294
Location
Sydney Australia
Looks really good. I can image it sounds great too  ;D

What is the purpose of the IC's on the input channel boards? I assume they are for peak + signal LEDs as mentioned in the features list.
 

fragletrollet

Well-known member
Joined
Sep 19, 2010
Messages
352
Location
Oslo
Just ordered the partial kit! Looking forward to the build. It`s going to take a while before I can order all the parts...
 

fragletrollet

Well-known member
Joined
Sep 19, 2010
Messages
352
Location
Oslo
So, there are a few unclear things in the BOM. Some of the caps that are linked to in the bom are way under the voltage requirement stated in the BOM, like the 470uf one. What are people using for the bi-polar 22uf electros? Never encountered bipolar electros before.

I am also curious as to what people are using for the dual pots (ch 16-24) and what rotary switch for the master volume (the bom states a 21 turn one, which seems to be an odd value? going by the audiomaintenance switches here...)

And for the pan knob, would this work? http://capi-gear.com/catalog/product_info.php?cPath=50_131&products_id=446
The bom states a single gang pot (and not the usual dual for pan). The center detent is what`s important for me here.

Any input would be appreciated  8)

 

qmp audio

Well-known member
Joined
Mar 4, 2011
Messages
198
Location
Chicago
fragletrollet said:
I am also curious as to what people are using for the dual pots (ch 16-24) and what rotary switch for the master volume (the bom states a 21 turn one, which seems to be an odd value? going by the audiomaintenance switches here...)

And for the pan knob, would this work? http://capi-gear.com/catalog/product_info.php?cPath=50_131&products_id=446
The bom states a single gang pot (and not the usual dual for pan). The center detent is what`s important for me here.

What did you end up using for pots?  I still need to get the dual 1k.

Pan pots,  single pole is fine for unbalanced:  http://capi-gear.com/catalog/product_info.php?cPath=50_131&products_id=308

Master,  i chose the CAPI elma:  http://capi-gear.com/catalog/product_info.php?cPath=51_133&products_id=400




 

r2d2

Well-known member
Joined
Jan 16, 2011
Messages
535
Location
A-rea 51
....same , but different diy layout of original Api Summ "set" ,
as in image?

r
 

Attachments

  • API SUMM BUSS.jpg
    API SUMM BUSS.jpg
    167.8 KB · Views: 279

fragletrollet

Well-known member
Joined
Sep 19, 2010
Messages
352
Location
Oslo
qmp audio said:
fragletrollet said:
I am also curious as to what people are using for the dual pots (ch 16-24) and what rotary switch for the master volume (the bom states a 21 turn one, which seems to be an odd value? going by the audiomaintenance switches here...)

And for the pan knob, would this work? http://capi-gear.com/catalog/product_info.php?cPath=50_131&products_id=446
The bom states a single gang pot (and not the usual dual for pan). The center detent is what`s important for me here.

What did you end up using for pots?  I still need to get the dual 1k.

Pan pots,  single pole is fine for unbalanced:  http://capi-gear.com/catalog/product_info.php?cPath=50_131&products_id=308

Master,  i chose the CAPI elma:  http://capi-gear.com/catalog/product_info.php?cPath=51_133&products_id=400

Hey, thanks for the feedback. I`m also looking for the dual 1k`s, I thought audiomaintenance had them, but doesn`t seem so.

I also see that CAPI has 470uf caps, but they seem to be 10V rated? Should go for 35V+ I presume from the BOM.
Also, when looking at bipolar electrolytics, these seem from the specs read at mouser etc, to have way shorter lifetime rating ? Like 2000 hours. Is this something to worry about?
 

axl

Member
Joined
Nov 1, 2013
Messages
19
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?
 

fragletrollet

Well-known member
Joined
Sep 19, 2010
Messages
352
Location
Oslo
There are these for the dual 1k log:

http://www.jlmaudio.com/shop/dual-1k-log-pot.html

Don`t know how they would stand up to the bourns tough... probably not as accurate, and maybe feel is worse? I don`t know.
 

Ninuz

Well-known member
Joined
Sep 20, 2011
Messages
61
I went with the JLM ones. They are fine but one of the pots are actually a bit out of balance.
Im thinking about changing to Bourns or Spectrol ones as they are supposed to be very accurate and they Spectrol ones are smaller so will fit easier between the backplate.

fragletrollet said:
There are these for the dual 1k log:

http://www.jlmaudio.com/shop/dual-1k-log-pot.html

Don`t know how they would stand up to the bourns tough... probably not as accurate, and maybe feel is worse? I don`t know.
 

ZekeProductions

Well-known member
Joined
Jul 17, 2015
Messages
54
I'm not sure how good these are but here are the Dual 1k pots I have found:

http://www.mouser.com/ProductDetail/Alpha-Taiwan/RV24BF-10-15R1-A1K/?qs=sGAEpiMZZMtC25l1F4XBU70HIOTw2yVioKwu10nGPQY%3d

Anyone use them, any advice?


EDIT: you only need 4 of these not 8 like the BOM says.
 

fragletrollet

Well-known member
Joined
Sep 19, 2010
Messages
352
Location
Oslo
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?
 

ZekeProductions

Well-known member
Joined
Jul 17, 2015
Messages
54
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


 

Attachments

  • dual pots.JPG
    dual pots.JPG
    101.1 KB · Views: 31

Ninuz

Well-known member
Joined
Sep 20, 2011
Messages
61
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
 

Ninuz

Well-known member
Joined
Sep 20, 2011
Messages
61
Here is my finished mixer.

 

Attachments

  • 2402_FB111.jpg
    2402_FB111.jpg
    1.3 MB · Views: 274

Ninuz

Well-known member
Joined
Sep 20, 2011
Messages
61
And a picture from inside. Need to clean up the cabling a bit;)
Most DOA's are from APP ( Pier Paolo) which I can really recommend.
 

Attachments

  • ins_2402.jpg
    ins_2402.jpg
    1.7 MB · Views: 356

fragletrollet

Well-known member
Joined
Sep 19, 2010
Messages
352
Location
Oslo
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?
 

fragletrollet

Well-known member
Joined
Sep 19, 2010
Messages
352
Location
Oslo
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?
 

Latest posts

Top