about stamp adapter
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i'm not in US and the country i'm living is using 240v supply.So ,i
had to buy my own adapter because the distributer there say they are
not responsible for this .i'm using the adapter which provide the
output voltage of 3-12v and 1200 mA .but when i see the original
adapter,it only gives 1000mA .I'm afraid that the 1200mA adapter will
spoil my whole inex-1000 circuit board .is it ok to use?
and is it true that the distributor of the stamp will not responsible
for providing the adapter which suits my country?thanks .
had to buy my own adapter because the distributer there say they are
not responsible for this .i'm using the adapter which provide the
output voltage of 3-12v and 1200 mA .but when i see the original
adapter,it only gives 1000mA .I'm afraid that the 1200mA adapter will
spoil my whole inex-1000 circuit board .is it ok to use?
and is it true that the distributor of the stamp will not responsible
for providing the adapter which suits my country?thanks .
Comments
wrote:
> i'm not in US and the country i'm living is using 240v supply.So ,i
> had to buy my own adapter because the distributer there say they
are
> not responsible for this .i'm using the adapter which provide the
> output voltage of 3-12v and 1200 mA .but when i see the original
> adapter,it only gives 1000mA .I'm afraid that the 1200mA adapter
will
> spoil my whole inex-1000 circuit board .is it ok to use?
> and is it true that the distributor of the stamp will not
responsible
> for providing the adapter which suits my country?thanks .
Hi
The 1200mA of your adapter are ok. This number just states what the
adapter is capable to deliver. The voltage should be set to something
from 6V to 9V. The current needed depends on your circuit. The stamp
alone is satisfied with a few mA, but if you want do drive motors you
may need up to 1000mA or more. 250mA should be sufficient for most
needs.
If your distributor does not provide power supplies (PSU), you have
to buy one spearately or use one you already have if suitable.
If your PSU is able to deliver more power than you need (e.g. 1200mA
and you need just say 50mA) this is ok. But if your circuit yould
require 2000mA your PSU will get hot and the voltage breaks down.
Note that the voltage regulator on the INEX-1000 can deliver not more
than about 1A, otherwise it would get to hot and burn out eventually.
Regards
Adrian
about, and a few not to care about.
The first critical value is the voltage. If the
supply does not deliver enough voltage, your
project won't work. For the Stamp, the lowest
the voltage can be is 6 volts DC.
The first thing that is NOT so important is the
current. Given a voltage, a stamp will only
'pull' 50 mA or so, depending on what else it
is driving. DC Adaptors are rated for the
maximum current that can be 'pulled' from them.
If you try to exceed this they overheat. If
you stay less than this (ANY value less than
this) everything is fine.
So your 1200 mA DC supply may be more
expensive, and CAN supply more current than
required, but will ACTUALLY supply only the
current that the Stamp is using.
Note: Stamp boards are wired so the center
pin of your power connector is POSITIVE, the
outer 'sleeve' of the power connector is
GROUND. This configuration is not a
standard with all DC adapters. Verify with
a volt meter BEFORE you plug it in to your
board that you have this proper configuration.
--- In basicstamps@yahoogroups.com, "kaijiun83" <kaijiun83@y...>
wrote:
> i'm not in US and the country i'm living is using 240v supply.So ,i
> had to buy my own adapter because the distributer there say they
are
> not responsible for this .i'm using the adapter which provide the
> output voltage of 3-12v and 1200 mA .but when i see the original
> adapter,it only gives 1000mA .I'm afraid that the 1200mA adapter
will
> spoil my whole inex-1000 circuit board .is it ok to use?
> and is it true that the distributor of the stamp will not
responsible
> for providing the adapter which suits my country?thanks .
warts are rated at their given load. So a 12V 1A wart will produce a lot
more than 12V with a 50 or 100mA load. The Stamp has an upper limit on
voltage and with any shunt regulator putting in a higher voltage will
generate more heat.
So be sure that you aren't feeding a very high voltage out of a nominal
12V supply.
Al Williams
AWC
* NEW: Real world I/O for C++, VB, Excel, Java, more...
http://www.al-williams.com/gp3.htm
> Given a voltage, a stamp will only
> 'pull' 50 mA or so, depending on what else it
> is driving. DC Adaptors are rated for the
> maximum current that can be 'pulled' from them.
> If you try to exceed this they overheat. If
> you stay less than this (ANY value less than
> this) everything is fine.
>
> So your 1200 mA DC supply may be more
> expensive, and CAN supply more current than
> required, but will ACTUALLY supply only the
adapter from parallax was measured at 16V with no
load. Note most voltages are specified
as under load.
I assume if your DC supply is too high, the
regulator (that little 3-wire piece with the
metal tab on it) will overheat, and then
shutdown. This results in no damage, but can
be a little alarming. If it's too hot to touch,
somethings wrong.
On the other hand, the BS2 has its own
regulator, which is good for 6V to 9V or so,
but has even more limited heat dissapation than
a separate regulator would.
I believe an external 7805 regulator can handle up
to 24 volts as an input voltage without damage
-- this should give you some flexibility,
again as long as you don't exceed the
heat dissapation.
--- In basicstamps@yahoogroups.com, "Al Williams" <alw@a...> wrote:
> This is true of course. However, there is one other caveat. Typical
wall
> warts are rated at their given load. So a 12V 1A wart will produce
a lot
> more than 12V with a 50 or 100mA load. The Stamp has an upper limit
on
> voltage and with any shunt regulator putting in a higher voltage
will
> generate more heat.
>
> So be sure that you aren't feeding a very high voltage out of a
nominal
> 12V supply.
>
> Al Williams
> AWC
> * NEW: Real world I/O for C++, VB, Excel, Java, more...
> http://www.al-williams.com/gp3.htm
>
>
> > Given a voltage, a stamp will only
> > 'pull' 50 mA or so, depending on what else it
> > is driving. DC Adaptors are rated for the
> > maximum current that can be 'pulled' from them.
> > If you try to exceed this they overheat. If
> > you stay less than this (ANY value less than
> > this) everything is fine.
> >
> > So your 1200 mA DC supply may be more
> > expensive, and CAN supply more current than
> > required, but will ACTUALLY supply only the