API 312 Thread!
- Thread starter fallout
- Start date
Help Support GroupDIY Audio Forum:
fallout
Well-known member
yep.. Pay attention to current draw on the relays though.. The 24v ones are nice..
-Jay
[quote author="BladeSG"]Just interested to know if I can use any voltage PCB mount relay (5/9/12/24V) on Fabio's board, so long as I change the supply voltage to it?
Thanks,
Steve[/quote]
-Jay
[quote author="BladeSG"]Just interested to know if I can use any voltage PCB mount relay (5/9/12/24V) on Fabio's board, so long as I change the supply voltage to it?
Thanks,
Steve[/quote]
fallout
Well-known member
The advantage of 24v relays is that they draw less current... I personally used them on mine..
-Jay
-Jay
Siegfried Meier
Well-known member
This is the PDF I was referring to. The top PCB is different from the bottom one - what is different and which one is the original?
http://www.siegfriedmeier.com/electronics/APIpcb.jpg
Thanks,
Siegfried
http://www.siegfriedmeier.com/electronics/APIpcb.jpg
Thanks,
Siegfried
fallout
Well-known member
The image ?http://www.siegfriedmeier.com/electronics/APIpcb.jpg? cannot be displayed, because it contains errors.
[quote author="Siegfried Meier"]This is the PDF I was referring to. The top PCB is different from the bottom one - what is different and which one is the original?
http://www.siegfriedmeier.com/electronics/APIpcb.jpg
Thanks,
Siegfried[/quote]
[quote author="Siegfried Meier"]This is the PDF I was referring to. The top PCB is different from the bottom one - what is different and which one is the original?
http://www.siegfriedmeier.com/electronics/APIpcb.jpg
Thanks,
Siegfried[/quote]
Siegfried Meier
Well-known member
yeah I'm getting that in Camino, but it works fine in Safari. Not sure about a PC. It's the PDF that's in the 312 Metas that Duka Sound made a few years ago - here's the link:
http://www.groupdiy.com/index.php?topic=290&postdays=0&postorder=asc&start=15
Thanks,
Siegfried
http://www.groupdiy.com/index.php?topic=290&postdays=0&postorder=asc&start=15
Thanks,
Siegfried
fallout
Well-known member
The top one appears to be the orginal... The bottom looks like it was modified to fit a different input transformer..
-Jay
-Jay
dissonantstring
Well-known member
hi siegfried,
jay is correct. the duka file has two boards. the top is the original board layout for the 2622 input and the lower one is a redisign by duka for an OEP input transformer. have not tried either one, but the top one is a redraw of the original 312 board.
regards,
grant
jay is correct. the duka file has two boards. the top is the original board layout for the 2622 input and the lower one is a redisign by duka for an OEP input transformer. have not tried either one, but the top one is a redraw of the original 312 board.
regards,
grant
Siegfried Meier
Well-known member
Great thanks. I'm sure I could find a way to fit the Cinemag in there. What is the OEP transformer - not familiar with that.
I also have a question on how people are wiring their EDAC connectors for 48v, Phase, Pad and voltage in/out. I'll probably use a JLM Go-Between. I'd like some pin outs if possible.
Thanks!
Sig
I also have a question on how people are wiring their EDAC connectors for 48v, Phase, Pad and voltage in/out. I'll probably use a JLM Go-Between. I'd like some pin outs if possible.
Thanks!
Sig
fallout
Well-known member
The pinouts are on this page:
http://www.danalexanderaudio.com/api.html
-Jay
http://www.danalexanderaudio.com/api.html
-Jay
dissonantstring
Well-known member
hi siegfried,
do a search for OEP on the forum. it's a rather cheap and quite good sounding alternative for many of the project builds here like the G1176, 312, baby animal, fetboy, etc. you can find them at farnell or canford in Europe. i'm in the US so i get mine from newark. i believe that duka and fabio have built 312s with the OEP transformers on input and they have been happy with them. check out the 312 build thread.
regards,
grant
do a search for OEP on the forum. it's a rather cheap and quite good sounding alternative for many of the project builds here like the G1176, 312, baby animal, fetboy, etc. you can find them at farnell or canford in Europe. i'm in the US so i get mine from newark. i believe that duka and fabio have built 312s with the OEP transformers on input and they have been happy with them. check out the 312 build thread.
regards,
grant
Hello,
I am constructing preamp API 312 of Fabio. I am going to use the transformer input of Cinemag CM-75101APC. This transformer takes noticeable in red the pin number 1.
as it is the correct position to fit the transformer in pcb?
Somebody can help me with this doubt?
Thanks.
I am constructing preamp API 312 of Fabio. I am going to use the transformer input of Cinemag CM-75101APC. This transformer takes noticeable in red the pin number 1.
as it is the correct position to fit the transformer in pcb?
Somebody can help me with this doubt?
Thanks.
AnalogPackrat
Well-known member
[quote author="delaymix"]Hello,
I am constructing preamp API 312 of Fabio. I am going to use the transformer input of Cinemag CM-75101APC. This transformer takes noticeable in red the pin number 1.
as it is the correct position to fit the transformer in pcb?
Somebody can help me with this doubt?
Thanks.[/quote]
Pin 1 of the 75101 goes to the hole marked "WHITE" on Fabio's 312 pcb. Note that when using the 75101, pins 2 and 3 are "builderer configurable" so you can run the input transformer at 1:5 or 1:10 (or use a DPDT switch to make it a front panel control). Either way, you must decide and then wire pins 2 and 3 appropriately as those pads are not connected to anything else on the pcb.
A P
I am constructing preamp API 312 of Fabio. I am going to use the transformer input of Cinemag CM-75101APC. This transformer takes noticeable in red the pin number 1.
as it is the correct position to fit the transformer in pcb?
Somebody can help me with this doubt?
Thanks.[/quote]
Pin 1 of the 75101 goes to the hole marked "WHITE" on Fabio's 312 pcb. Note that when using the 75101, pins 2 and 3 are "builderer configurable" so you can run the input transformer at 1:5 or 1:10 (or use a DPDT switch to make it a front panel control). Either way, you must decide and then wire pins 2 and 3 appropriately as those pads are not connected to anything else on the pcb.
A P
dukasound
Well-known member
[quote author="Siegfried Meier"]This is the PDF I was referring to. The top PCB is different from the bottom one - what is different and which one is the original?
http://www.siegfriedmeier.com/electronics/APIpcb.jpg
Thanks,
Siegfried[/quote]
This is my work. Above is for original and below is for OEP.
Duka
http://www.siegfriedmeier.com/electronics/APIpcb.jpg
Thanks,
Siegfried[/quote]
This is my work. Above is for original and below is for OEP.
Duka
[quote author="AnalogPackrat"]
Bigger C3 give better bass response. Not sure what the tradeoff is. I'm using 1000uF. The originals used 250uF.
A P[/quote]
Just wondering about the statement above, I've searched this thread for info about C3 and cannot find anything else about the reason(s) why there are the 3 choices of 220uF, 1000uF and 4700uF.
Any ideas about the 'tradeoff'?
Thanks,
Steve
had to edit, just realised my 312th post is in this 312 thread. LOL!
Bigger C3 give better bass response. Not sure what the tradeoff is. I'm using 1000uF. The originals used 250uF.
A P[/quote]
Just wondering about the statement above, I've searched this thread for info about C3 and cannot find anything else about the reason(s) why there are the 3 choices of 220uF, 1000uF and 4700uF.
Any ideas about the 'tradeoff'?
Thanks,
Steve
had to edit, just realised my 312th post is in this 312 thread. LOL!
ulysses
Well-known member
Bigger caps are more expensive and they take up more space. Aside from that, the only drawback would be that a physically larger capacitor will probably have more inductance and therefore less than perfect HF response. If that's something you're worried about, then bypass the electrolytic with a small film cap (0.01 or 0.1 µF).
