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'P16Pro Programmer xster, and pwer mosfet question'
1999\01\05@225312 by Matthew Ballinger

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Hi all, 2 questions here.
1. I'm building a P16Pro serial PIC programmer designed by Dojan Dobaj. I have
all but 1 part avalible to me, which are the PNP BC557 transistors used for
switching the programming voltages. Is using this exact transistor critical to
the operation? Or can I use say a MPS2907 which can be bought at Radio Shack?
2. I'm building an alarm, remote car start, keyless entry system for my car.
Would there be any problems with using logic level turn on power mosfet's
rather than relays to supply power up to 25 amp's. I'm going to end up using
about 15 relays in all which takes up much room and cash. The one I'm looking
at turns on completely at 5V with a drain-source resistance of about .022ohms.
Will this work?
Thank you all for any type of feed back!

1999\01\06@002729 by Geoff Thornton

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face
> -----Original Message-----
Hi Mathew,
               I too have recently built the P16PRO, but I got mine from Kits-R
-Us
http://www.kitsrus.com ) , through Dontronics ( http://www.dontronics.com)for $US25.00,
be aware that you have to download the software from
http://www.geocities.com/SiliconValley/Peaks/9620/ ), and it is shareware and will
expire after 30 days unles a $US 25.00 registration fee is paid.

> Subject: P16Pro Programmer xster, and pwer mosfet question
>
>
> Hi all, 2 questions here.
> 1. I'm building a P16Pro serial PIC programmer designed by Dojan
> Dobaj. I have all but 1 part avalible to me, which are the PNP BC557
> transistors used for switching the programming voltages. Is using this
exact
> transistor critical to the operation? Or can I use say a MPS2907 which can
be bought at
> Radio Shack?

No the PNP transistor doesn't appear to be critical and SHOULD be able to be
replaced with any garden variety PNP signal transistor the 2907 you want to
use should be fine as it has a higher collector current and power capability
than the 557, but gee the 557 should be cheaper and just as readily
available.


> 2. I'm building an alarm, remote car start, keyless entry system for my
car. Would there be >         > any problems with using logic level turn on
power mosfet's
> rather than relays to supply power up to 25 amp's. I'm going to end up
using about 15 relays  > in all which takes up much room and cash. The one
I'm looking at turns on completely at 5V     > with a drain-source
resistance of about .022ohms.Will this work? Thank you all for any type of >
feed back!

No using MOSFETS is fine (use N-channel enhancement devices), but 25A
through one device thats a lot of current and looking at your Ron that's a
14W device so you will want something like the BUK456-60A/H, these run at
about $10.00 in Australia. Even if you do decide to use relays you will need
to interface them with a transistor or FET or relay driver IC as most logic
IC's and the PICs cannot safely provide the current required to drive the
relay coil directly without damaging the IC, and don't forget back EMF
protection either.


Regards Geoff :)
==================
spam_OUTgeoffTakeThisOuTspamtechie.com

1999\01\06@003743 by James Cameron

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Matthew Ballinger wrote:
> [Can I use MPS2907 in place of BC557 in a PIC programmer?]

I don't believe this transistor is critical.  I would expect (95%) the
substitute type you mention to work perfectly, provided it is described
as a substitute by Radio Shack.  The Radio Shack 1987 Semiconductor
Reference Guide (276-4010) says for BC557 use their 276-2023, which has
a "Direct Commercial Equivalent" of MPS2907.  Silicon PNP 625mW,
Vcbo=60, Vceo=40, Vebo=5, Ic=600mA, hFE=50, TO92.

As for logic level MOSFETs, if you mention the device type someone may
have an opinion on it.  If the data says it is fully on long before 5V
then I would be happy about it.  I tried to drive an MTP3055 at 5V gate
voltage switching a 12V 21W lamp and the MOSFET got very hot.

--
James Cameron                                      (.....cameronKILLspamspam@spam@stl.dec.com)

OpenVMS, Linux, Firewalls, Software Engineering, CGI, HTTP, X, C, FORTH,
COBOL, BASIC, DCL, csh, bash, ksh, sh, Electronics, Microcontrollers,
Disability Engineering, Netrek, Bicycles, Pedant, Farming, Home Control,
Remote Area Power, Greek Scholar, Tenor Vocalist, Church Sound, Husband.

"Specialisation is for insects." -- Robert Heinlein.

1999\01\06@133100 by Jim Robertson

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At 22:52 5/01/99 EST, you wrote:
>Hi all, 2 questions here.
>1. I'm building a P16Pro serial PIC programmer designed by Dojan Dobaj. I
have
>all but 1 part avalible to me, which are the PNP BC557 transistors used for
>switching the programming voltages. Is using this exact transistor
critical to
>the operation? Or can I use say a MPS2907 which can be bought at Radio Shack?


You can use the 2907 but if memory serves correctly, you will need to
rotate them
180 degrees as the emmiter and collector are transposed as compared to the
BC547.
This is assuming that the MPS2907 are the same pinout as the PN2907 parts.
(I got caught on this myself)

Note that this is from memory so please just be aware of the possibility
and check
it out before soldering.

Jim

--------------------------------------------------------
Jim Robertson
Email: newfoundspamKILLspampipeline.com.au

http://www.pipeline.com.au/users/newfound
--------------------------------------------------------

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