[sdiy] 1N914 vs. 1N4148 ?

[Harry Bissell Jr]

--- KA4HJH <ka4hjh at gte.net> wrote:



> In power supply design there is a famous rule of
> thumb--always use a
> rectifier that's rated at least twice the peak
> unfiltered voltage. This is
> because in a traditional power supply a rectifier is
> reverse-biased with -V
> from the transformer on one side and (approximately)
> +V from the filter
> capacitor at the bottom of one half of the cycle.
> This gives a maximum
> potential of ~2V across the rectifier. I'm sure more
> than one newbie has
> been caught by that one. With a 24V RMS transformer
> the peak potential will
> be over 65V so a 50V rectifier will be toast even
> though "it's only a 24V
> power supply".

this IS what I meant when I said...

"Now (imho) only a jack at ss would use either of these
as 'power rectifiers'... and / or use them where they
expected high voltgaes."

Anyone who would use a "signal" diode as a power
rectifier (you don't need speed here...) qualifies
for jack at ss in my book  ;^P

That what the 1N4004 is for.  I usually buy only the
1N4007 (1000V) and I don't worry about any voltage
I usually find in a synth.

If you need fast, power diodes... they do exist. They
aren't 1N914 ~or~ 1N4148

Has anyone seen people using fast recovery diodes in
60Hz power supplies ??? What's up with that ???

Is it some audiophile thing ???

H^) harry