cantskienuf said:
It is a good question, but you have to remember the the LCDPS has a CLRC front end. That "R" can create as much as 4-5V drop at the loads the Buffalo presents.
I would not use a 6V trafo unless you remove/jumper the "R" in the CLRC
A 12-15V trafo works just great!
Cheers!
Russ
R-core vs. toroidal?
Russ (or anyone else), I saw an earlier post where you ok'd the usage of a particular R-core transformer; can't relocate the post though, sorry. I am thinking of using R-cores as well, to power LCDPS (to Buffalo) + LCBPS (to IVY)...had some more general questions:
1) In theory, can a single R-core work where two toroidals are required? Or will this cause the ground loop problem? I am having a hard time evaluating the multi-secondary configuration of the R-cores...for example...can the R26-14 below, with 4 secondaries, power both an LCDPS and an LCBPS?
2) What is the danger in using transformers that provide a greater than spec'ed voltage or current?
3) What are the current and voltage requirements for the LCDPS (connected to Buffalo) and LCBPS (connected to IVY) under max load?
I'm looking at these transformers in particular (all 50W), with the following secondary configurations:
R26-28: 0-12V @ 1.2A (x2); 0-9V @ 1.2A (x2)
R26-22: 0-18V @ 1.75A (x2)
R26-14: 0-18V @ 1A (x4)
R26-11: 0-12V @ 0.78A (x2); 0-15V @ 0.78A (x2)
Are all these usable? Comments on which is the best selection? My uninformed choice is that R26-22 can serve the same as TPA's 15VA 0-15V (x2) stock toroidal transformer, but is beefier.
I recognize toroidal transformers are easy to use here, given the mains filtering on the power supplies and the simple configuration required. But the cost to try R-core is approximately equal...and it seems to have advantages w.r.t 60Hz noise and stray field emissions/case placement/etc. Hey, this is DIY, experimentation is encouraged, right? ;-)
When supplying a different voltage than specified (say supplying 18V where 15V is spec'ed)...do I need to modify anything on the LCDPS or LCBPS?
Thanks!
(Apologies for the newbie questions...am trying to absorb info quickly, but reliable sources for (low current) transformer selection have eluded me)
Russ (or anyone else), I saw an earlier post where you ok'd the usage of a particular R-core transformer; can't relocate the post though, sorry. I am thinking of using R-cores as well, to power LCDPS (to Buffalo) + LCBPS (to IVY)...had some more general questions:
1) In theory, can a single R-core work where two toroidals are required? Or will this cause the ground loop problem? I am having a hard time evaluating the multi-secondary configuration of the R-cores...for example...can the R26-14 below, with 4 secondaries, power both an LCDPS and an LCBPS?
2) What is the danger in using transformers that provide a greater than spec'ed voltage or current?
3) What are the current and voltage requirements for the LCDPS (connected to Buffalo) and LCBPS (connected to IVY) under max load?
I'm looking at these transformers in particular (all 50W), with the following secondary configurations:
R26-28: 0-12V @ 1.2A (x2); 0-9V @ 1.2A (x2)
R26-22: 0-18V @ 1.75A (x2)
R26-14: 0-18V @ 1A (x4)
R26-11: 0-12V @ 0.78A (x2); 0-15V @ 0.78A (x2)
Are all these usable? Comments on which is the best selection? My uninformed choice is that R26-22 can serve the same as TPA's 15VA 0-15V (x2) stock toroidal transformer, but is beefier.
I recognize toroidal transformers are easy to use here, given the mains filtering on the power supplies and the simple configuration required. But the cost to try R-core is approximately equal...and it seems to have advantages w.r.t 60Hz noise and stray field emissions/case placement/etc. Hey, this is DIY, experimentation is encouraged, right? ;-)
When supplying a different voltage than specified (say supplying 18V where 15V is spec'ed)...do I need to modify anything on the LCDPS or LCBPS?
Thanks!
(Apologies for the newbie questions...am trying to absorb info quickly, but reliable sources for (low current) transformer selection have eluded me)
Re: R-core vs. toroidal?
All that really matters if you want both an LCBPS and an LCDPS is that you have 4 secondaries at 9-15V that can do at least say .4A each. It does not really matter if those come from one transformer or two, or even 4(single secondary).
R26-11 looks like a likely candidate in your list.
Cheers!
Russ
Digitalscrap said:
All that really matters if you want both an LCBPS and an LCDPS is that you have 4 secondaries at 9-15V that can do at least say .4A each. It does not really matter if those come from one transformer or two, or even 4(single secondary).
R26-11 looks like a likely candidate in your list.
Cheers!
Russ
1) It's not really a question of R-Core vs Toroidal, but dual secondary vs quad secondary. You can use any transformer type, either 2 dual secondary or one quad secondary. Of the ones listed, I would use R26-28 or R26-11.
2) Using too high of a voltage will create more heat from the vregs. There is no downside of having too high of a current rating.
3) 18V secondaries are too high. I would use R26-28, running the IVY with the 12V secondaries (regulated output set to +-12VDC) and the 9V for Buffalo, or the R26-11, 15V secondaries for IVY @ +-15VDC and 12V secondaries for Buffalo.
2) Using too high of a voltage will create more heat from the vregs. There is no downside of having too high of a current rating.
3) 18V secondaries are too high. I would use R26-28, running the IVY with the 12V secondaries (regulated output set to +-12VDC) and the 9V for Buffalo, or the R26-11, 15V secondaries for IVY @ +-15VDC and 12V secondaries for Buffalo.
Are there any suggestions for the +5V and -12V needed to run the TOSLINK Module? I guess I could probably grab a leg off the transformer for the LCDPS and run it through a regulator to get the +5 volts. Does that sound like a bad idea for any reason? Would there be a preferance as to whether I shared the secondary with VA or VD? I guess I can probably Google-around to find a negative regulator and run that from a separate traffo, or buy another LCBPS, but that seems a bit of overkill, or is it?
The board itself is tiny with an onboard pot, which provides the mounting mechanism, so you just need a front-panel hole for the pot. This is the pot we are planning on using (metal bushing version): http://www.panasonic.com/industrial/components/pdf/aok0000ce4.pdf
SPDIF MUX is tested and working, but there is one small error on the this first run PCBs which requires you to install a small wire jumper if you want your "LOCK" LED to work.
Luckily there is a pad right next to the LED pad which you can bridge to connect it to GND. This will make the LED light happily when the signal locks. I will post pic of it later.
The circuit itself functions wonderfully. I am using it right now.
We will probably make this run of boards available to anyone who wants them very soon. I think there are 20 or so left. Not sure.
The MUX allows 4 inputs 3 can be standard consumer SPDIF and one AES.
The output is both SPDIF and I2S.
There is a 4 pos DIP for selecting various settings for the CS8416.
I will get a manual done for it soon.
Cheers!
Russ
Luckily there is a pad right next to the LED pad which you can bridge to connect it to GND. This will make the LED light happily when the signal locks. I will post pic of it later.
The circuit itself functions wonderfully. I am using it right now.
We will probably make this run of boards available to anyone who wants them very soon. I think there are 20 or so left. Not sure.
The MUX allows 4 inputs 3 can be standard consumer SPDIF and one AES.
The output is both SPDIF and I2S.
There is a 4 pos DIP for selecting various settings for the CS8416.
I will get a manual done for it soon.
Cheers!
Russ
Re: Thanks for the info...
That's the AC1, it is quite a lot more complex.
The Volumite is intended for those folks who just want a simple inexpensive knob volume control. The Volumite can have firmware for Opus, Joshua Tree, or Buffalo(or anything else that can be controlled via I2C).
Cheers!
Russ
boudy said:
That's the AC1, it is quite a lot more complex.
The Volumite is intended for those folks who just want a simple inexpensive knob volume control. The Volumite can have firmware for Opus, Joshua Tree, or Buffalo(or anything else that can be controlled via I2C).
Cheers!
Russ
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