Reducing resistor network

  • #1
634
1
How do I reduce this resistor network.

The input current and the return current should be equal. But in this case, some current will also flow to ground. Can't get my head around this.
 

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  • #2
berkeman
Mentor
58,173
8,231
How do I reduce this resistor network.

The input current and the return current should be equal. But in this case, some current will also flow to ground. Can't get my head around this.
No current flows "to ground" per se. Just connect the two ends of the resistors that have ground symbols with a wire -- that's the only other path for current. No current "leaves" the system the way it's drawn.
 
  • #3
634
1
So the two grounded resistors are in parallel with the 12k resistor?
 
  • #4
berkeman
Mentor
58,173
8,231
So the two grounded resistors are in parallel with the 12k resistor?
Yep!
 
  • #5
634
1
The 12K is the input impedance of a receiver IC. I gotta increase R4,R5 to keep the impedance close to 12k.
 

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