AW: [basicstamps] Re: 2 P 40 Heat
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Posts: 46,084
Hi,
I assume your input signal is +12 or 0.
I assume you are doing input only, as you
certainly can't DRIVE a 12-volt signal.
Is your 12-volt signal referenced to the same
ground as your stamp?
Yes, it is.
For input only, the stamp shouldn't be pulling
any kind of current from its input pins, which
would be the source of heat -- on input, the
pins look like a high-impedance.
What are your other pins driving? That could
be the source of heat.
Only one more pin driving a DMX-Device via RS232
The big possiblity is that your Stamp ground
and your signal ground are not connected, and
you may have more than the 3.5 volts at each
input pin than you think. If it's over 5V,
this would not be good.
I did connect them, I think taht is not the mistake. Actually I have been
running it for several days now and like other group members sugeested a
little warmth may be normal, it doesnt get worse and it doesn't seem to hurt
the stamp.
Thanks very much!
--- In basicstamps@yahoogroups.com, "ulibasic" <ulibasic@r...> wrote:
> Hello Stampers,
>
> I am using the 2 P 40 in my latest project. What I want to know is,
if it
> may get a little warm while working. I am using 20 input pins, each
pulled
> down via 10K and connected via 22K to a 12V-signal. That makes
about 3.5V at
> each input.
>
> Is that OK and is it normal that the 2 P 40 gets a little warm?
>
> Thanks for help,
>
> Uli
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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I assume your input signal is +12 or 0.
I assume you are doing input only, as you
certainly can't DRIVE a 12-volt signal.
Is your 12-volt signal referenced to the same
ground as your stamp?
Yes, it is.
For input only, the stamp shouldn't be pulling
any kind of current from its input pins, which
would be the source of heat -- on input, the
pins look like a high-impedance.
What are your other pins driving? That could
be the source of heat.
Only one more pin driving a DMX-Device via RS232
The big possiblity is that your Stamp ground
and your signal ground are not connected, and
you may have more than the 3.5 volts at each
input pin than you think. If it's over 5V,
this would not be good.
I did connect them, I think taht is not the mistake. Actually I have been
running it for several days now and like other group members sugeested a
little warmth may be normal, it doesnt get worse and it doesn't seem to hurt
the stamp.
Thanks very much!
--- In basicstamps@yahoogroups.com, "ulibasic" <ulibasic@r...> wrote:
> Hello Stampers,
>
> I am using the 2 P 40 in my latest project. What I want to know is,
if it
> may get a little warm while working. I am using 20 input pins, each
pulled
> down via 10K and connected via 22K to a 12V-signal. That makes
about 3.5V at
> each input.
>
> Is that OK and is it normal that the 2 P 40 gets a little warm?
>
> Thanks for help,
>
> Uli
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
[noparse][[/noparse]Non-text portions of this message have been removed]