converting a pcb to schematic.

R

roy

Guest
I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
other has 3 ic, and several transistors along with various resistors,
diodes and capacitors. I need to obtain the circuit from the board
inorder to troubleshoot it . It is used in a governor control.
Is there any software or are there people who will convert it to schematic
for a price ??? If there is software that can convert it at least (very
basic conversion) to a schematic, it would really help. Its very difficult
doing it physically as the printed circuit is double sided though not very
complex. I have clear photographs of both sides of the boards.

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radium1212_at_gmail_dot_com@foo.com (roy) wrote in
news:95938$4c725f42$43de0cc0$25319@news.flashnewsgroups.com:

I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
other has 3 ic, and several transistors along with various resistors,
diodes and capacitors. I need to obtain the circuit from the board
inorder to troubleshoot it . It is used in a governor control.
Is there any software or are there people who will convert it to schematic
for a price ??? If there is software that can convert it at least (very
basic conversion) to a schematic, it would really help. Its very difficult
doing it physically as the printed circuit is double sided though not very
complex. I have clear photographs of both sides of the boards.
Click to expand...
No.

You'd have a much easier time souping up AutoTune to redeem a bad singer, and
that, too, is impossible. There are reasons we have brains capable of
extending craft into art. Let them atrophy at your own risk.

If it's any help, op-amp circuits for simple process control are fairly
basic. Start with any circuit from a standard text book, then modify it as
needed to model your circuit.
 
"roy" <radium1212_at_gmail_dot_com@foo.com> wrote in message
news:95938$4c725f42$43de0cc0$25319@news.flashnewsgroups.com...
I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
other has 3 ic, and several transistors along with various resistors,
diodes and capacitors. I need to obtain the circuit from the board
inorder to troubleshoot it . It is used in a governor control.
Is there any software or are there people who will convert it to schematic
for a price ??? If there is software that can convert it at least (very
basic conversion) to a schematic, it would really help. Its very difficult
doing it physically as the printed circuit is double sided though not very
complex. I have clear photographs of both sides of the boards.
Click to expand...

First of all sketch the component side and itemise all the components and
their values.

I find it helps to scribe the component symbols on the solder side with a
sharp pointed knife (scalpel).

You will reach a point where the evolving schematic is beginning to make
sense but the finer details of the tracks are getting harder to follow.

Now is the time to start carefully removing components so you can trace
point to point with a DMM on low Ohms range.

As long as you document each stage you shouldn't have any problem putting it
back together.
 
"ian field" <gangprobing.alien@ntlworld.com> a écrit dans le message de
news: NNAco.194162$y_2.189079@hurricane...
"roy" <radium1212_at_gmail_dot_com@foo.com> wrote in message
news:95938$4c725f42$43de0cc0$25319@news.flashnewsgroups.com...

I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
other has 3 ic, and several transistors along with various resistors,
diodes and capacitors. I need to obtain the circuit from the board
inorder to troubleshoot it . It is used in a governor control.
Is there any software or are there people who will convert it to
schematic
for a price ??? If there is software that can convert it at least (very
basic conversion) to a schematic, it would really help. Its very
difficult
doing it physically as the printed circuit is double sided though not
very
complex. I have clear photographs of both sides of the boards.


First of all sketch the component side and itemise all the components and
their values.

I find it helps to scribe the component symbols on the solder side with a
sharp pointed knife (scalpel).

You will reach a point where the evolving schematic is beginning to make
sense but the finer details of the tracks are getting harder to follow.

Now is the time to start carefully removing components so you can trace
point to point with a DMM on low Ohms range.

As long as you document each stage you shouldn't have any problem putting
it back together.
Click to expand...
A good alternative to removing components to follow the tracks behind them
on a double ou multilayer board is simply... to Xray the populated PCB ;+).
Just ask it as a favor to your best doctor friend...
Yours,
Robert
 
roy wrote:
I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
other has 3 ic, and several transistors along with various resistors,
diodes and capacitors. I need to obtain the circuit from the board
inorder to troubleshoot it . It is used in a governor control.
Is there any software or are there people who will convert it to schematic
for a price ??? If there is software that can convert it at least (very
basic conversion) to a schematic, it would really help.
Click to expand...
Might be simpler to write software to convert Klingon to English !

Its very difficult
doing it physically as the printed circuit is double sided though not very
complex. I have clear photographs of both sides of the boards.
Click to expand...
You'll have to do it 'by hand'.

Suggest you start by identifying circuit 'nodes' and then placing the
components as connected to them.

Graham
 
In article <4c76529b$0$6237$c3e8da3@news.astraweb.com>, Eeyore <rabbitsfriendsandrelations@removethishotmail.com> wrote:
roy wrote:
I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
other has 3 ic, and several transistors along with various resistors,
diodes and capacitors. I need to obtain the circuit from the board
inorder to troubleshoot it . It is used in a governor control.
Is there any software or are there people who will convert it to schematic
for a price ??? If there is software that can convert it at least (very
basic conversion) to a schematic, it would really help.

Might be simpler to write software to convert Klingon to English !

Its very difficult
doing it physically as the printed circuit is double sided though not very
complex. I have clear photographs of both sides of the boards.

You'll have to do it 'by hand'.

Suggest you start by identifying circuit 'nodes' and then placing the
components as connected to them.
Click to expand...

Do a reverse image of one of the images, then overlay the two.
You could use clear mylar. Laser machine does it well.

I just usually do it the hard way, and also make use of a bright
light on reverse side.

greg
 
Not a possibility. You will need to do it "by hand".

I have a similar problem in front of me right now only it is quite a bit more
complex than your board sounds. Mine is a double layer board and many of the
components cover tracks so you can't tell where they go visually. I either buzz
them out or in some cases I revert to completely removing the component from the
board in order to trace the tracks.

You will also need to identify all of the components (IC's and other semis) and
download their datasheets so that you can determine schematic connections and
pin numbering. Your first efforts at drawing a schematic will be rather crude
and you will need to check and double check the connections before arriving at a
correct result. After sevewral iterations your schematic will eventually look
like the original would have but it can take a day or 2 to get that far.


On Mon, 23 Aug 2010 11:45:06 +0000, radium1212_at_gmail_dot_com@foo.com (roy)
wrote:

:
:I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
:eek:ther has 3 ic, and several transistors along with various resistors,
:diodes and capacitors. I need to obtain the circuit from the board
:inorder to troubleshoot it . It is used in a governor control.
:Is there any software or are there people who will convert it to schematic
:for a price ??? If there is software that can convert it at least (very
:basic conversion) to a schematic, it would really help. Its very difficult
:doing it physically as the printed circuit is double sided though not very
:complex. I have clear photographs of both sides of the boards.
:
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:Delivered via http://www.electrondepot.com/
:Electronics Enthusiasts' Community of the Net
:Web and RSS access to your favorite newsgroup -
:sci.electronics.components - 22985 messages and counting!
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