bs2 vin vdd & fun fun fun!!
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Posts: 46,084
The VDD pin acts as an output for
the BS2 voltage, if you are using
the BS2 on-module regulator.
It acts as a +5 volt input, if you
are using an on-board regulator.
If you put +12 on it, I believe you
are bypassing ALL regulators.
I believe the Stamp processor is max
rated at 5.5 volts DC. I would
assume 12 Volts would smoke it.
Please tell us what really happened,
it would be very educational.
BTW, I once accidentally wired a
TTL chip backwards (put 5 volts
on ground, and 0 volts on VCC).
It glowed for a bit.
It didn't work afterwards.
I highly discourage this practice.
--- In
basicstamps@yahoogroups.com, "[noparse][[/noparse].......................................
..]" <manwithapipe@y...> wrote:
> hello all...
>
> what, if any, are the consequences of applying say 12v (the max) to
> VDD as opposed to VIN to power your stamp project. are the
> consequences disastrous? or will it regulate as well?
>
> manny
the BS2 voltage, if you are using
the BS2 on-module regulator.
It acts as a +5 volt input, if you
are using an on-board regulator.
If you put +12 on it, I believe you
are bypassing ALL regulators.
I believe the Stamp processor is max
rated at 5.5 volts DC. I would
assume 12 Volts would smoke it.
Please tell us what really happened,
it would be very educational.
BTW, I once accidentally wired a
TTL chip backwards (put 5 volts
on ground, and 0 volts on VCC).
It glowed for a bit.
It didn't work afterwards.
I highly discourage this practice.
--- In
basicstamps@yahoogroups.com, "[noparse][[/noparse].......................................
..]" <manwithapipe@y...> wrote:
> hello all...
>
> what, if any, are the consequences of applying say 12v (the max) to
> VDD as opposed to VIN to power your stamp project. are the
> consequences disastrous? or will it regulate as well?
>
> manny
Comments
Very bad idea. When you do this you are bypassing the voltage regulator. I
had a student smoke a Stamp that way.
Jonathan
www.madlabs.info
Original Message
From: "[noparse][[/noparse].........................................]" <manwithapipe@y...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, July 29, 2003 10:48 PM
Subject: [noparse][[/noparse]basicstamps] bs2 vin vdd & fun fun fun!!
> hello all...
>
> what, if any, are the consequences of applying say 12v (the max) to
> VDD as opposed to VIN to power your stamp project. are the
> consequences disastrous? or will it regulate as well?
>
> manny
>
>
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>
>Turned on the supply & ........................................*pop*
>http://groups.yahoo.com/group/basicstamps/files/dead-stamp.gif
At least you have a sense of humor about it! The good folks at
Parallax might be sympathetic to the plight of the midnight burnout,
in terms of repair/replacement/exchange.
If you have a setup prone to that sort of thing (like mine, a table
covered with a spaghetti plate of jumper cables and clip leads),
protection on the i/o pins and the power pins could save some
$$&*!xx^(#.
-- I/O pins with resistors, ~220 ohm.
-- Reset pin with its capacitor.
-- Vdd and Vin with a fuse/diode combo:
power ---oFUSEo---o
Vdd
250ma |
| 1N4734 zener 5.6v 1W
`--|<---Vss
same thing for Vin, except use a 1N4001 instead of the zener.
Reversing the battery or applying 12 volts to Vdd would blow the
fuse before the voltage rises to a destructive level.
-- Tracy
tracy@e... writes:
> If you have a setup prone to that sort of thing (like mine, a table
> covered with a spaghetti plate of jumper cables and clip leads),
> protection on the i/o pins and the power pins could save some
spaghetti plate of jumper cables and clip leads??.......you are not
alone!!!!!!!!!!!!!
[noparse][[/noparse]Non-text portions of this message have been removed]