Ah, two centre tapped windings (or 4 separate windings), I see, do you want to go monoblock all the way?
Well, yes why not? and if you want to keep the channels completely separate, as in a true monoblock, then each should also be in a separate chassis so there is no common 0V (gnd). It all depends on how far you want to go with the separation.
I actually wanted to kind of keep it all together. I know there would be improvement by separating it the whole way but I don't have that possibility right now. And with two transformers for the pre + one for the power amp, it would get really tight in there. Even if I'm planning on mounting the 2 transformers, the filter caps and the power amp heatsink on top of the chassis, tube amp style.
The nac152xs clone I'm using needs 2 separate 24v rails, most articles/Threads i've read advise to use a pair of regulators and also one winding per regulator.
That sounds like dual secondary to me. Any reason it needs to be r- it ei-core? Toroidy can make you a nice shielded, dual secondary toroidal for a very reasonable price ..
Do you mean separate positive and negative rails, not four separate rails? You don't need a 27V transformer to get 24V DC
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Here's where I got the design http://www.acoustica.org.uk/t/naim/psu pix/raw dc psu/raw dc psu.pdf
It's definitely just 2 positive rails, I'll probably use one negative rail to power my RIAA circuit but that's another story.
It's definitely just 2 positive rails, I'll probably use one negative rail to power my RIAA circuit but that's another story.
That looks like an old style full wave setup (x2). The centre tapped windings shouldn't be necessary with bridge rectifiers. You can see the bridges aren't being fully used.
Yes it is and on the design they aren't but I wanted to use the negative rail to power te riaa circuit so I will need at least one full wave.
I've had great results with some other mods and suggestions from them ( for the rega planet for example) and they do seem to be pretty specialised in naim gear, that's how I first got on to their site. So according to you a single 0-27V 50VA transformer with the 2 regulaters connected in parallel would be more than good enough for what I'm doing here ?
This is indeed what I need just for the preamp but as I said before (sorry my answers might get a bit lost in all the other posts) I will need one negative rail for my riaa circuit. I have one lying around from a sansui au 999 that I really like a lot and I won't do anything else with it so I decided to put it in here. I uses a -25v rail. I'll be using the same regulator as for the preamp but in a negative version.
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