A new clock is born: Silicon Labs Si5351 CMOS Clock Generator
Can you guys inform if it would be an upgrade for the "normal" oscilators ?
Can you guys inform if it would be an upgrade for the "normal" oscilators ?
I'm suprised something is not sliding off the pcb! (A bit like Simons super reg in his Philips cd player about 6 month ago) 😀
Brent
Wow thats very poor. I suppose that is what happens with all logic gates inside that thing. Good for a lot of applications just not serious audioBrent
I don't think he has finished it yet, he put it in to show size of pcb. I think he will be running the 5V from it
Brent
So he has made some serious progress then! From padlifter #1, he's now able to lift things off the board without touching them?
Ray
LOL Yes.
What's amazing is when the power transistor slid off the reg pcb nothing was damaged. I refitted the transistor and it all worked again.
Brent
What's amazing is when the power transistor slid off the reg pcb nothing was damaged. I refitted the transistor and it all worked again.
Brent
It was an Audiocom reg so I dont know what solder was used. The main problem was this reg was running a 7220 ic and was not heatsinked enough with it being a smt device.
Brent
Brent
Quite. The SAA7220 is a power-hungry monster and demanded so much current (and voltage step-down) from the regulator that it went into meltdown 😀
Audiocom Super-Regs of that age are no good for heatsinking, they're a very poor design in that regard.
Audiocom Super-Regs of that age are no good for heatsinking, they're a very poor design in that regard.
An audiocom reg on a 7220~😱
I didn't think they were much cop over about 50mA? I've got them on my green dac, glued to heatsinks but i didn't use 1 for the 7220!!
I didn't think they were much cop over about 50mA? I've got them on my green dac, glued to heatsinks but i didn't use 1 for the 7220!!
Yep, thats right, the plan is to power the DAC off it. Either that or build another coffin reg. It is a Salas shunt reg board and I am waiting on parts, I just mounted it the case to plan the layout. I know they use quite a bit of power, but I assume I will get a high quality 5V feed from it?
The designer of the clock said "The TCXO need high transcient current. I ever use lower powered TCXO, but it sound not as good as high power type I used now."
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Hello Guys,outer & inner foil of poly caps,how should it be terminate, please advise on the orientation.
I've used a salas shunt reg and they are very very good however......
They are large (you could fit about 5 very good normal sized regs in the same space). The are greedy and they run very hot.
Personally, i'd fit a couple of PSU's and half a dozen regs in the same space!
They are large (you could fit about 5 very good normal sized regs in the same space). The are greedy and they run very hot.
Personally, i'd fit a couple of PSU's and half a dozen regs in the same space!
Most caps have some kind of marking, like a black stripe, different wire lengths to indicate the outer foil (mostly the shorter wire) or, like Brent indicated, the direction of the print on the sleeve. Anyhow, it SHOULD be indicated in the manufacturers datasheet. This side is tied to GND usually, so the outer foil acts as a shield. In signal coupling applications, the outer foil goes towards the source of the signal (so the inner foil is connected to the output sockets or the next stage, the input side). The idea is that the signal source side has lowest impedance and is less susceptable to noise.
In the case of a CD player's output cap, it's less critical. Signal levels are quite high at that point, so the influence of noise is limited. Nonetheless, it doesn't hurt to insert them correctly, it doesn't cost anything extra 😀.
Ray
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I asked myself a lot of times how Salas shunt would perform powering some chips in my CDP but I never tryed them because of the heat generated.
I am very interested in the outcome because these shunts can produce really impressive results.
As for now, I will keep using Brent´s splendid spowers.
Hi ricardo, here is something I've yet to hear make a decent sound!
The regs run really hot just ticking over, i've had all sorts of issues with I2S input from my player and have just (arrived today) got hold of yet another CD50 purely to run I2S to this DAC (just for testing!). 2 pos rail and 2 neg rail psu's with 15x 1800uF on each rail! into 4 salas regs 3 for the TDA and 1 for the clock logic! All local decoupling with BG FK's and Nichicon solid polymer. TBH this should really be the last DAC I ever build!! If the Salas regs are that good, the I/V and 7220 will get them too!
The boards were group buy's on here and the a lot of the development came from ultimate NOS thread. The regs are stright off the forum too.
However........
It is my opinion that inside the 63 where space is a premium, a small opamp feedback reg is the best option. I'd rather have Brents 26 SPowers inside my player than 3 shunt regs (based on the amount of space they take up)!
It will be intersting to see what happens when I get this sorted but I'm hoping that it really is the ultimate.......😎
