How do I draw the equivalent circuit for this diagram?

Thread Starter

QA1311

Joined Dec 26, 2019
7
Hello! I have to represent these connections in an equivalent circuit

so I did this
Where Ry and Rx are the summations of parallel resistances..But I think it is incomplete and maybe incorrect. Could you please help ?

ericgibbs

Joined Jan 29, 2010
11,563
hi QA,
What about the switched resistors R12,13...15 in the OPA feedback loop.?
and say the DVM.
Update your drawing and repost.
E

Thread Starter

QA1311

Joined Dec 26, 2019
7
hi QA,
What about the switched resistors R12,13...15 in the OPA feedback loop.?
and say the DVM.
Update your drawing and repost.
E
I added their reciprocals and represented them with Ry
Is this correct?

ericgibbs

Joined Jan 29, 2010
11,563
hi QA,
You cannot lump the resistors, they are individually selected by that rotary switch to set the Gain.
Show the switch.
E

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Thread Starter

QA1311

Joined Dec 26, 2019
7
hi QA,
You cannot lump the resistors, they are individually selected by that rotary switch to set the Gain.
Show the switch.
E
First of all, thank you Eric for your help..
I don’t know how to represent a rotary switch but I did this

ericgibbs

Joined Jan 29, 2010
11,563
hi QA,
The dashed black line [ now high lighted in Green] indicates that the two switch elements are on the same switch knob.
Look at this image, the 'wiper' of the switch marked with a arrow head, points to the switch contact which has been selected.
A rotary switch is normally drawn as a semi circle of dots, and the wiper as an arrow, use a dashed line to show that the two sections are on the same switch.
OK.?
E
BTW: Your drawing is incorrect, it shows individual switches.

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Thread Starter

QA1311

Joined Dec 26, 2019
7
hi QA,
The dashed black line [ now high lighted in Green] indicates that the two switch elements are on the same switch knob.
Look at this image, the 'wiper' of the switch marked with a arrow head, points to the switch contact which has been selected.
A rotary switch is normally drawn as a semi circle of dots, and the wiper as an arrow, use a dashed line to show that the two sections are on the same switch.
OK.?
E
BTW: Your drawing is incorrect, it shows individual switches.
I got it now. Thank you very much for your help

Kjeldgaard

Joined Apr 7, 2016
435
The resistors R16, R17, R18, R19 is not connected right.

Thread Starter

QA1311

Joined Dec 26, 2019
7
The resistors R16, R17, R18, R19 is not connected right.
I know, I’ve corrected them. Thanks for your reply.

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