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High current germanium diodes?

?

_

Jan 1, 1970
0
Got an old bike with a 6v system; replaced the selenium rectifier with a
silicon one but an extra .4 volt of charging voltage might be helpful. Are
there germanium diodes out there in the 10-20 amp range? Alternator is
rated 6V 50W at 5k rpm.
 
D

Den

Jan 1, 1970
0
_ said:
Got an old bike with a 6v system; replaced the selenium rectifier with a
silicon one but an extra .4 volt of charging voltage might be helpful.
Are
there germanium diodes out there in the 10-20 amp range? Alternator is
rated 6V 50W at 5k rpm.


A FET rectifier?
 
P

Phil Allison

Jan 1, 1970
0
"_" <[email protected]>


** **** off - you asinine Canuck imbecile.

Got an old bike with a 6v system; replaced the selenium rectifier with a
silicon one but an extra .4 volt of charging voltage might be helpful.

** ROTFL !!

Wot a fucking moron !!!!!!!!!!!!!!!!!!!!

Wherever do these idiots get their wrong info from ??

Surely not the totally trustworthy internet ????????


Are there germanium diodes out there in the 10-20 amp range?


** Only in museums.

You dopey Cunuck ass.



....... Phil
 
R

René

Jan 1, 1970
0
Schottky diodes are a lot more common in that size range and
have about the same forward drop. They have quite a bit of
reverse leakage, though.

For example:
http://www.onsemi.com/pub_link/Collateral/MBR2515L-D.PDF

True.

However, the generator system on older bikes usually behave like
current sources, the voltage regulator (if at all present) is a big
honking zener or zener / thyristor combination.
Forward voltage drop may not be that important.
 
P

Phil Allison

Jan 1, 1970
0
"René"
However, the generator system on older bikes usually behave like
current sources, the voltage regulator (if at all present) is a big
honking zener or zener / thyristor combination.
Forward voltage drop may not be that important.


** The OP is nuts.

The forward drop of the selenium diodes in the old bridge is very likely
MORE than that of a silicon equivalent at a current of 10 amps.

Plus it really don't matter at all for battery charging, for the obvious
reason you gave.



..... Phil
 
E

Eeyore

Jan 1, 1970
0
Tim said:
There are bazillions of Schottky types in that current range, so finding
one should be easy.

It'll need heatsinking if the OP intends to use the rated output.

Graham
 
A

Al

Jan 1, 1970
0
True.

However, the generator system on older bikes usually behave like current
sources, the voltage regulator (if at all present) is a big honking
zener or zener / thyristor combination. Forward voltage drop may not be
that important.

I may have a few germanium ones in my "junk box." They are old, circa
60's, but may do the job for you. If you're interested, reply to this
group and I'll send you one gratis. In return do someone else a favor.

Al
 
R

Rich Grise

Jan 1, 1970
0
Got an old bike with a 6v system; replaced the selenium rectifier with a
silicon one but an extra .4 volt of charging voltage might be helpful.
Are there germanium diodes out there in the 10-20 amp range? Alternator
is rated 6V 50W at 5k rpm.

Are you running anything but lights? They'll work on AC, you know. :)
(well, incandescents will. ;-) )

Good Luck!
Rich
 
R

Rich Grise

Jan 1, 1970
0
I may have a few germanium ones in my "junk box." They are old, circa
60's, but may do the job for you. If you're interested, reply to this
group and I'll send you one gratis. In return do someone else a favor.

You have 10-20 amp GERMANIUM diodes?????!!!!?!?!?!?????

You MUST post pictures!

Thanks,
Rich
 
T

Tim Williams

Jan 1, 1970
0
Rich Grise said:
You have 10-20 amp GERMANIUM diodes?????!!!!?!?!?!?????

You MUST post pictures!

Sure, I do too. I don't have many (only two), but I know a guy with
buckets. He recently made a linear amplifier with them. [1]

Tim

[1] For those who haven't noticed, a germanium power transistor is composed
of *two* diodes. ;-)
 
?

_

Jan 1, 1970
0
Are you running anything but lights? They'll work on AC, you know. :)
(well, incandescents will. ;-) )

Good Luck!
Rich

Everything is (now) LED except the main and dipped beams.

Standard 6 volt auto stuff is not that bright, and especially so when you
are sitting at a stop, engine idling. I suspect that charging does not
begin until 2500 revs or so; would like to drop that down by as much as
possible - hence the thought of eliminating as much voltage drop (and
current draw) as possible.
 
R

Rich Grise

Jan 1, 1970
0
Rich Grise said:
You have 10-20 amp GERMANIUM diodes?????!!!!?!?!?!?????

You MUST post pictures!

Sure, I do too. I don't have many (only two), but I know a guy with
buckets. He recently made a linear amplifier with them. [1]

[1] For those who haven't noticed, a germanium power transistor is
composed of *two* diodes. ;-)

Oh, Boo. That was a cheap trick! ;-)

Cheers!
Rich
 

neon

Oct 21, 2006
1,325
Joined
Oct 21, 2006
Messages
1,325
practicaly any germanium little old germanium diode can conduct hi amps. read on the trick is to keep them cool. there ther new devices and someone allredy made you aware of it for 6 v there is no problem
 
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