Diodes

[skittles]

wanting to charge a batter & was wondering which diode is right for the job?
I've read online where people have gotten 6amps by simple hand crank and up
to 30 amps with the use of pedal power & gears to help turn reversed
pemanent magnetic dc motors faster then simple hand cranking.

looking at the Radio Shack diodes: they Sell a 25 amp 50volt bridge
rectifier
any thoughts on this?

 

[skittles]

without the diode the battery will actually power up the DC Motor and also
could result in de-charging instead of charging the battery. So that little
3 dollar item can save you some trouble. I have searched online and people
have this unit for sell at unreasonable prices ($600.00 and up) when the
parts themselves are easy to come by... for example you have a Permanent
Magnetic DC Motor in your car that powers your Fan for AC. You also have a
few in the house for such things that require different speeds. (washing
machine, blender, vacuum - not all will have a dc magnetic motor but some
will) The ideal motor will run off of 24 volts AC resulting in 12 volts DC
current enough to charge a battery -- You can use a crank to turn it but
that's rather silly when you can run either a chain or a belt to it and turn
it 4 times the rate with a bike or larger wheel. This will result in faster
turning which will give you more amps. Without amps your dead in the water.
I'd like some ideas about a voltage regulator other then a 20 amp car fuse
which seems ideal but will not prevent over charging. any ideas - I suppose
any ideas at all would do... I realize that a regular generator is easier to
come by and allot more efficient but in a case like Mississippi where fuel
became a problem they could have had the power to run household items and
with enough ingenuity could power a water pump or other necessities,. yes
you would need to run small watt items but it could be done...

 

[Steve Spence]

What do you need the diode for?

to prevent the battery from spinning the permanent magnet generator.

 

[skittles]

so i suppose different size diodes are ok as long as the amp isn't to low or
to high... any idea on how prevent the battery from over charging? Is their
some type of voltage regulator that automatically shuts off? I know a marine
battery will work better then a car battery will because of the fact that
it's designed to run where as the car batteries are designed to just start
things, but this is one area that is a little dangerous. They do
occasionally blow up if over charged and usually kill people if their
standing near them... and I like being alive. ( rant time) I like working to
much and getting paid to little. I like getting screwed out of money by
wealthy pricks in order to make themselves richer. Yes i like life... even
if i don't like all the people in it.. I know people down south that went
without water because they depended on the electric company to much.... Do
you know the electric companies charged people down south even though they
didn't have power during those weeks following the hurricane. Yes along with
the phone companies... not a pro-rated amount either... no phone and no
power but bills still came..

 

[skittles]

"Q"

16amp diode at what voltage?

 

[Michelle P]

As long as you do not exceed the voltage you can parallel the diodes to
obtain high amperage.
Michelle

 

[skittles]

I don't wanna purchase this thing as seen in the below lings (not an
advertisement) I would like to be able to build it
out of whatever is lying around lol - so any ideas

www.rfcomm.harris.com/products
www.rfcomm.harris.com/products/tactical-radio-communications/12027-0000-01.p
df

 

[JoeSixPack]

"Q"

16amp diode at what voltage?

The diode voltage rating should exceed your peak voltage by a fair margin to
avoid damage from voltage spikes. A set of working diodes from an old
battery charger or alternator would work. A simpler, lower-tech alternative
would be a cutout relay such as was used before the advent of the diode in
automotive charging systems. Simply wire the energizer coil of a
single-pole relay to the output leads of the generator. When the generator
spins up, the resulting voltage closes the relay and charging can begin.
When the generator stops charging, the relay opens and no current bleeds
back through generator.

 

[zero]

The diode voltage rating should exceed your peak voltage by a fair margin to
avoid damage from voltage spikes. A set of working diodes from an old
battery charger or alternator would work. A simpler, lower-tech alternative
would be a cutout relay such as was used before the advent of the diode in
automotive charging systems. Simply wire the energizer coil of a
single-pole relay to the output leads of the generator. When the generator
spins up, the resulting voltage closes the relay and charging can begin.
When the generator stops charging, the relay opens and no current bleeds
back through generator.

You've just described a latching relay circuit.

The generator will indeed close the contacts when it begins generating,
the contacts will hook the generator (and the relay coil) to the battery.

The relay won't open until the battery voltage goes away.

To the original poster: Large full-wave rectifier blocks work just fine as
blocking diodes you seek. They contain 4 diodes in an epoxy block with
heatsink plate on the bottom. You only need to use 2 terminals (1 diode)
so there is some waste of parts, but they are cheap and easy to find.

zero

 

[Andy]

Find yourself an old Delco-Remy 'Delcotron' alternator at the wrecking yard
and strip the power rectifier diode pack out of it... It consists of three
pairs of good quality diodes that you can wire up any way you like with the
added bonus of them already mounted in a heat sink.

Regards,
Andy

 

[JoeSixPack]

You've just described a latching relay circuit.

The generator will indeed close the contacts when it begins generating,
the contacts will hook the generator (and the relay coil) to the battery.

The relay won't open until the battery voltage goes away.

To the original poster: Large full-wave rectifier blocks work just fine as
blocking diodes you seek. They contain 4 diodes in an epoxy block with
heatsink plate on the bottom. You only need to use 2 terminals (1 diode)
so there is some waste of parts, but they are cheap and easy to find.

zero