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Use a voltage regulator.got an old portable cd player needs 3vdc got a 4.5vdc car adapter need
to make the 2 work together. So how do i reduce the 4.5v to 3v.
No. Resistors don't work because the current isn't constant. So ascan i use a resistor? what size?
Same issue.thanks
also what size to go from 12vdc to 6vdc
All the players I have use two AA cells but use 4.5V in the ac adaptergot an old portable cd player needs 3vdc got a 4.5vdc car adapter need
to make the 2 work together. So how do i reduce the 4.5v to 3v can i
use a resistor? what size? thanks
also what size to go from 12vdc to 6vdc
got an old portable cd player needs 3vdc got a 4.5vdc car adapter need
to make the 2 work together. So how do i reduce the 4.5v to 3v can i
use a resistor? what size? thanks
also what size to go from 12vdc to 6vdc
got an old portable cd player needs 3vdc got a 4.5vdc car adapter need
to make the 2 work together. So how do i reduce the 4.5v to 3v can i
use a resistor? what size? thanks
also what size to go from 12vdc to 6vdc
Those drops are about right, but depend on the current. The Si diodesWith non-constant load, you could use some
combination of diodes. Si diodes will drop
about 0.6 - 0.9V, Schottky diodes 0.3 - 0.5V,
Ge diodes 0.3 - 0.4V, LEDs 1.7V - 3.5V.
These are *ballpark figures*, so in rare cases
the drop could be outside of the above ranges.
"BIGSteve" <fitzgerald_s@hotmail.com> wrote in message
news:1106786477.379089.27880@f14g2000cwb.googlegroups.com...
got an old portable cd player needs 3vdc got a 4.5vdc car adapter
need
to make the 2 work together. So how do i reduce the 4.5v to 3v can i
use a resistor? what size? thanks
also what size to go from 12vdc to 6vdc
Those drops are about right, but depend on the current. The Si diodes
such as 1N4148 can't handle the several hundred milliamps that the
player will need. The diodes should be two 1N4002 rectifiers, which can
handle 1 amp, and will drop about .8V each at several hundred mA. A
schottky rectifier that will work is the 1N5817.
Ge diodes that will handle that much current are no longer available.
LEDs would only handle 30 mA, and would burn out if a few hundred mA
went thru them.
Not "simply" if the load is not a steady current (which it isn't). Duh.with:u=rxi you can simply find out,how big your resistor has to be
Resistors don't work that way. The voltage reduction through a resistorgot an old portable cd player needs 3vdc got a 4.5vdc car adapter need
to make the 2 work together. So how do i reduce the 4.5v to 3v can i
use a resistor? what size? thanks
also what size to go from 12vdc to 6vdc
Yeah, I should have said that LEDs in the 5mm package can only handleI know the voltage drop is somewhat dependent on the
current, and obviously, usually the smaller the diode, the
less current it can handle. And I guess I should've
mentioned that.
As for LEDs, some can handle more than you'd expect.
I have a 486 based linux router, and to quiet down its
PS fan, I hooked up 4 LEDs in a 2 by 2 config serially.
The fan actually worked fine with only 2 series LEDs,
but I decided to double them up to halve the current.
"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com
wrote
in message news:10vke68mrat39a9@corp.supernews.com...
Those drops are about right, but depend on the current. The Si
diodes
such as 1N4148 can't handle the several hundred milliamps that the
player will need. The diodes should be two 1N4002 rectifiers, which
can
handle 1 amp, and will drop about .8V each at several hundred mA. A
schottky rectifier that will work is the 1N5817.
Ge diodes that will handle that much current are no longer
available.
LEDs would only handle 30 mA, and would burn out if a few hundred mA
went thru them.