Are these costy? I mean to setup with extra parts if needed (ultra low noise PSU?) or it's a stand-alone device (it's late and I don't want to check... shame on me...)
Matthieu
And nobody done it on a CD63? Overkill?
I remember well once I came here and you were choosing bewteen op amp combos, Ray's was looking to vaccum his player, then went discrete, LM4562 came... and no output tx yet?
Men, what are you doing!? Maybe some savings 😉
I remember well once I came here and you were choosing bewteen op amp combos, Ray's was looking to vaccum his player, then went discrete, LM4562 came... and no output tx yet?
Men, what are you doing!? Maybe some savings 😉
I've been talking about this with Lee (for about 4-5 months now lol). And it is something that interests me, I'll be honest and say i've been waiting for a customers cd player to come in with them fitted but so far non.
Lee was buying some cheap ones to try
Brent
Lee was buying some cheap ones to try
Brent
Audiocom use them in their latest expensive mods, but they use them AFTER LM4562 opamps!
Cheers, Lee.
Cheers, Lee.
I believe the Audio Consulting jobs they use are very expensive. I'd also be interested in how this sounds, most say it's good.
Simon
Simon
Malefoda said:
Not all DACs can drive a transformer directly. Current and voltage out DACs are generally no problem, but the SM5872 is PWM out. Maybe that's why Audiocom buffers it first with an LME49270.
Regards,
Ray
6h5c said:
Something like these maybe?
http://www.sowter.co.uk/dacs.php
I have previously considered type 9055 for TDA1541. Although I have currently parked the idea, I will almost certainly try at some point!
Ian
Brent & Lee,
I sent you both a private email but have had no replies. Did you get it? Did what I offer have zero interest?
Maybe it's in your spam filter, I know PM's to me often end up there.
Regards, Allen (Vacuum State)
I sent you both a private email but have had no replies. Did you get it? Did what I offer have zero interest?
Maybe it's in your spam filter, I know PM's to me often end up there.
Regards, Allen (Vacuum State)
I would think you need the 8347 then. The 1541 doesn't have symmetrical current outputs.
Ray
Ray
6h5c said:
Indeed! But, I was assuming that I could use the primary's in parallel. Then should I ever aspire to twin DACs, I could use the same TX with seperate primarys. 😉
The real problem with that approach for the 1541 is that the voltage compliance allowable at the output limits you to just 6ohms for the I/V resistor (25mV compliance limit), and so +/-12mV peak output. It'd need lots of gain to follow - 250x , or 47dB - for line level output, and doing that quietly and well enough is not necessarily going to be better or easier than a building a decent -performing active I/V + output stage... unless you think building a line stage with a S:N of -140dBV is easy 😉
Simple solution for you Ian - just buy 7 more dual-crown TDA1541As (with supporting clocks, power & decoupling) and you'll have 8x the output power.
Simon
Simon
Thats a great idea Simon!😀
I'll also try it in the cd50! Know where I can get a good price for 15 of them????
I'll also try it in the cd50! Know where I can get a good price for 15 of them????
Sorry to be so dull, but 8x1541s in parallel would only give more *current* , not more voltage compliance. You'd still need a 'magic' amplification stage (equivalent to the Johnson noise of a ~c.50ohm resistor!) for full '16-bit' recovery.
(I won't even get into the argument of whether more dacs in parallel is actually better...)
(I won't even get into the argument of whether more dacs in parallel is actually better...)
OK, but more current into a high step up ratio traffo could well solve most of the noise problems. That's what traffos can do well, turn a low Z current into a higher Z voltage, noise free!
As in MC cart amplification. 1:50 is not uncommon in this position.
Not discussingthe drawbacks of traffo sound...
Regards, Allen
www.vacuumstate.com
As in MC cart amplification. 1:50 is not uncommon in this position.
Not discussingthe drawbacks of traffo sound...
Regards, Allen
www.vacuumstate.com
True, but MC carts are not hard-limited distortion-wise by a given voltage like certain DACs are!
Oh, and MCs are usually very-low-Z output, whereaa current-output dacs are the opposite by design.
(yes, I know you know this Allen😉 Nice to see you here)
Oh, and MCs are usually very-low-Z output, whereaa current-output dacs are the opposite by design.
(yes, I know you know this Allen😉 Nice to see you here)
I was thinking of an MC stepup transformer for tda1541.
If a transformer would struggle with the output from the sm5872 (or vice-versa), how about using the first stage of Ray's DOS to sum the outputs and then using a 1:1 transformer to the output?
Although, if this did work, I'm skeptical as to how it'd be better than a couple more fets as in the DOS.
Allen, I'll get back to you later on today. Sorry for the delay, I've been really busy catching up with paperwork (and other very uninsteresting things)🙁
Cheers, Lee.
If a transformer would struggle with the output from the sm5872 (or vice-versa), how about using the first stage of Ray's DOS to sum the outputs and then using a 1:1 transformer to the output?
Although, if this did work, I'm skeptical as to how it'd be better than a couple more fets as in the DOS.
Allen, I'll get back to you later on today. Sorry for the delay, I've been really busy catching up with paperwork (and other very uninsteresting things)🙁
Cheers, Lee.
