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Amp Circuit help

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gbc2001

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Hi, (first post be gentle)

As part of a potential interview I have been given this question..

Despite having a good google - I can't really started with the question..

here is the circuit

**broken link removed**

and here are the questions

What is the gain of amplifier U41B?
What is the circuit configuration of U41A?
What is the expected maximum voltage range at “DEMAND+”?
What digital command streams would you expect to be sent to this circuit?

my thoughts, circuit configuration - scaling adder and gain rf/r1

any pointers to get me going would be most appreciated, thanks

kenny
 
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Since you posted a very fuzzy JPG file type for the schematic instead of a very clear PNG file type then we cannot see the important details.
 

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A JPEG or JPG file type is not used for schematics because it makes lines look very fuzzy. We use PDF, GIF or PNG file types which make a schematic extremely clear.

You cannot simply convert a fuzzy JPG schematic, instead you must save the original schematic as a clear file type. I frequently copy a very clear schematic useing the PRINT SCRN key then paste it into Microsoft Paint program, crop it then save it as a very clear PNG file type.
 

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I managed to clean up the diagram a tiny bit in CS3 the resistor in question is a 3.6k, that gives an amplification of x3 of U41B, the differentials are 1:1. ( 2.2k and 2.2k )

No.
The gain of an inverting opamp would be 3.6k/1.2k= 3.0.
But your opamp is non-inverting so its gain is 1 plus (3.6k/1.2k)= 4.0.
 
ok I have the circuit diagram on a PDF, will try and convert that into a suitable file..

will post it later

Kenny
 
hi Kenny,
You can post pdf files to the thread, use 'Go Advanced'
 
I join this:

Formatting schematics as jpg is bad, but is not the only reason for bad schematics. Also the image resolution is very important. In this case, it's not sure it's readable even if we got a straighten version.

MS paint is suggested. I have a even better one. Use FSIV to take screenshots and save drawings as 8 bit png's. I think no program can produce smaller png's (i have tested it against other graphic programs that saved png's).
 
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