Oscons tend to be DC leaky especially the polymer based variety so I'd be cautious using them for coupling, work nice decoupling digital IC's or XO's though.
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Oscons tend to be DC leaky especially the polymer based variety so I'd be cautious using them for coupling, work nice decoupling digital IC's or XO's though.
How much worse are they than any standard wet electrolyte electrolytic? I mean they all leak to a certain extent though we should be talking micro Amperes in reality.
Do you happen to know how much worse the solid electrolytics (SEP) are by chance? 10%? 100%? Sorry, i gots to know :eyebrows:
Cheers in advance Leo :)
Agreed, Leo, I also prefer the grey Rubycon CE types, which are still in circuit.Quote:
Originally Posted by leo
Those are next on the list Ali :)Quote:
Originally Posted by Ali Tait
Hopefully by then curiosity will stop getting the better of me!
Tried to source some of these, bloomin hard to find!Quote:
Originally Posted by MartinT
Are they not being made any more?
I remember there was a group buy from the States to get them for upgrading the opamp board...but that was a while ago.
Aye,at least they are cheap,I've got the SCR's in now,which cost more than the dac!
Hey Mark,Quote:
Originally Posted by Reid Malenfant
your comment about the voltage got me thinking...
As there didn't seem to be any concensus about voltages (as opposed to uf) for the caps for this application, and believe me I checked(!), I guess I tried a variety of values as they were just a few pence to buy.
Your comment though about 50v giving better performance due to lower losses...does this apply across the board with all opamps in this case or just the Sanyo solid electrolyte ones you spoke of?
Always keen to learn about this stuff! :)...:scratch:
Going by the different choices of cap made here, I guess like most hifi stuff it comes down to the individuals ears!
Is there a general concensus though about "best voltage" for caps for the passive output mod for the dac?
ta.
DP
Hi Gaz, it applies to all electrolytics & to a certain extent non electrolytic capacitors ;) The higher the voltage rating of the capacitor the less losses you'll get, less DC leakage current & you'll find that 99% of the time that capacitor ESR (equivalent series resistance) is lower as well.
In a way it's pretty obvious, a capacitor that is designed to have a maximum of say 25V accross it is manufactured to have a leakage current within certain limits. If you substituted one of lets say 4 times the voltage rating but kept the maximum voltage accross it at 25V or less then you'll get much less current leakage as that cap should have been designed to leak about the same as the 25V cap but at 100V ;)
Give it 25V & the leakage current should be 1/4 of the 25V cap...
I'd like to point out that all capacitors should be "formed" or in the case of an older cap, "reformed". This involves something as simple as a regulated power supply set at the maximum voltage of the capacitor & a high value resistor or current regulation to gradually charge the capacitor up before you ever use it. Obviously discharge through another resistor before fitting it into a circuit :doh:
Doing this should give you maximum capacitor performance by reducing leakage currents :)
Easily the best I've tried,but then I'm enjoying the Audio Note coppers in the AN dac too.