Best diodes for generic power supply

[Joseph K]

John,

For audio sound, don't look in the supply. Look at the induction of currents elsewhere, like ground.

That is a very valid point!

Ciao, George

[jackinnj]

Originally posted by AndrewT
How do we measure that leakage inductance of a toroid?

Then, how do we calculate the component values needed for a useful (not useless) snubber?

Short the primary leads together and measure the inductance of the secondary -- you can use the simple (and acurate) bridge method discussed by Steber: http://www.arrl.org/qex/2005/Steber.pdf

It is also helpful to know the winding coupling capacitance, and DC Resistance of the primary and secondary -- you can also measure this with a bridge.

There are a number of papers on calculation of snubber values -- and different types of snubbers for the application -- one often cited paper is by Hagerman "Optimum Snubbers" -- easy to find on the web.

[AndrewT]

Hi Jackinnj,
thanks for that link.
I have Hagerman saved.

[percy]

Jackinnj,
should the primary or the secondary be shorted ? Not arguing, just thought I had heard/read otherwise somewhere so I thought I'd confirm.

I used Speaker Workshop to measure the inductance.

[Elso Kwak]

High Speed Diodes

[Joseph K]

Elso,

It's good that You have reported that thread here, thanks!
Though if You intended to say "we are going in circles; everthing had been told before" then I say yes, we are going in circles -- though just the post 8 of that thread [by SY] justifies the new efforts here..

Ciao, George

[quasi]

Originally posted by forr


Hi Poobah,
In an other thread, Quasi suggested you needed a hair-cut. I've seen you have been to the hair dresser. But not for the intended aim.

regards ~~~~ Forr

§§§

....and it seems you've taken up smoking !

[jneutron]

Originally posted by Elso Kwak
High Speed Diodes

Hmm..

The links in the first post are nice. It's good to see that what I recall from previous work experience is still consistent with what they write. It is bad to see that they have not advanced a bit in TRR testing over the last 20 years.

Gensemi link was dead, though.

Any manu's actually write about using fast diodes in line supplies, or are all the manu tech papers out there still all about switching stuff and transient V-I losses (losses during switching)?

Cheers, John

[Legis]

Hi,

sorry for bringing up this old thread.

Does anybody have suggestions for fast switching, smooth recovery diodes to replace 1N4007s in a preamp? (and a source for them)

These "Hexfred" diodes are quite interesting: HFA15TB60PBF pdf, HFA15TB60PBF description, HFA15TB60PBF datasheets, HFA15TB60PBF view ::: ALLDATASHEET :::

... albeit they are guite large and expensive and I would like to find a diode with comparable specs (max forward current does not need to exceed 1A) but with smaller size, maybe regular "axial" kind of diode since 1N4007s are too.

Regards,

Legis

[phemenwa]

Hi guys, Vector plane makes a good point, in all the stuff I work on, audio gear and test gear, all the power supplies use...1N400x. That said, HexFred's or Schottky's is way more sexy then a plain ole diode. For a few bucks, who cares, I'll use the over engineered fancy devices and enjoy the result weather or nor I can hear it...or even measure it. Its a fun...hobby. Thanks all.