The Phonoclone and VSPS PCB Help Desk

[tube 300]

Originally posted by tube 300
About the Black Gate non polar, is there a "best" way to put them in the signal?
there is a short and longer wire i think one is inner and the other outer foil .

no one?

[woodturner-fran]

Well, I just soldered mine in whatever way they come to hand.... tell you what, if you cut the ends of the leads equal you won't have to worry about it!


Fran

[rjm]

tell you what, if you cut the ends of the leads equal you won't have to worry about it!

Brilliant Fran ... I should have done that before sending them out!

The position sees no DC bias (unlike coupling caps in a tube amp) so electrically there is no distinction between up and down.

[Peter Daniel]

Originally posted by tube 300

no one?

Originally posted by woodturner-fran
.... tell you what, if you cut the ends of the leads equal you won't have to worry about it!

The difference still exists: the NONPOLAR print is always on the side of shorter pin. For coupling, I prefer when signal enters through the shorter pin, for bypassing short pin on +.

[tube 300]

Thank Peter
Here is also a link that i find
http://www.acoustic-dimension.com/bl...e/techEcap.htm
you can read about the inner and outer foil.
Fran and Richard it was just a question, is it so stupid ?

[rjm]

There are no stupid questions ... just stupid answers.

Anyone seeing the long and short leads on the supposedly non-polar cap is going to wonder along similar lines.

While there is a difference mechanically between the two ends of the capacitor, which may or may not make a difference ... Peter thinks they do and he is entitled to his opinion ... I contend that under a pure AC signal there is no relevent electrical distinction between the signal "entering" and "leaving"... the difference can only manifest when the cap is under DC bias. That, in turn, is my opinion.

I do however make sure the caps are both connected the same "direction" between the two channels, but I dont keep consistency from build to build.

You may all do as you please.

Richard

[woodturner-fran]

Ah jeez, it was only a joke....


No one suffers from RJMs' aforementioned component nervosa more than me I can assure you. When I see stuff like that ie a cap thats nonpolar, shouldn't matter which way you connect it, and yet one lead is left longer than the other I'm tempted to subscribe to the machina dynamica mode of thought about audio.


Fran

[rjm]

[rjm]

Here is also a link that i find

I re-read that again (curse you!) ... first came accross it years ago. Now, as then, I cannot decide whether its complete balderdash or if there is actually something in it after all.

The short lead of the BG-N is the inner foil. The long lead is the outer foil and seemingly the case. Thus if it really matters to you and you want to follow Peter Daniel's advice, you should connect the short lead the pad marked "+" on the board.

Gack! Reading through that hideous translation again makes my head spin.

Richard

PS. (on the super e-cap) Look, seriously, if you take two inductors and connect them in parallel, you get half the inductance, half the ESR, and twice the stray capacitance. Even if there is any asymmetry in the way the coils are wound, for example, you cant simply cancel out the inductance by connecting one of the inductors "backwards". Until someone can give me a sensible response to that - preferably with some measurements - I'm not buying it.

[Ipanema]

Hi Guys,

I would like to build a phono clone for a friend who has a Audio Technica AT-F3 MC catridge. The specification shows that the impedance is 12ohms. May I Know what is the optimum R2 for this catridge?

Thannks.