# Placement of a resistor

1. Aug 23, 2013

### Infamous911

Am I correct in thinking that it would not matter if I place the 100ohm resistor after the 220nF capacitor (as shown in the picture), or before the capacitor?

2. Aug 23, 2013

### baudrunner

It certainly does matter where you place the resistor in this circuit, since each side of the capacitor has a different polarity. Furthermore, you have the 100 ohm resistor in parallel with R13, which tells me that you are trying to achieve a value for a resistance that you could not otherwise provide using a single resistor that you do not have in your possession as in Rtotal=1/(1/R1 +1/R2), which in this case is effectively 99.338 ohm, so by that reasoning alone, the resistor is improperly placed.

3. Aug 23, 2013

### Staff: Mentor

For a number of reasons, it probably does matter. Where it currently sits means that J "sees" an infinite DC path to ground. But move that resistor to the other side, and signal at J "sees" a DC path of 100Ω to ground. Big difference, where it's important.

You can apply similar reasoning to what the circuit on the right sees.

4. Aug 27, 2013

### CWatters

I agree with other replies.