question about a power supply filter resistor in an Expandora clone build

[eh là bas ma]

Hello,

I'm building Aion's Dynamo Reactive OD circuit, and im missing a 47R resistor for the power supply filter resistor at R21.

The closest i have is a 22R and a 10R. I also have bigger values like 330R.

There are other 47R resistors in the circuit (R6 and R18) so i wonder if using 32R instead at R21 could be fine,

or if i could use my 32R elsewhere in the circuit in order to free a 47R resistor for R21 ?

https://aionfx.com/app/files/docs/dynamo_documentation.pdf

 

[anevilspar7an]

Daisy chain two 22R in series, another option is to parallel two 100R together.

 

[eh là bas ma]

Daisy chain two 22R in series, another option is to parallel two 100R together.

unfortunately i have only one 22R, one 10R and the next value i have is 330R

 

[eh là bas ma]

I guess i ll use the 32R for now, and i ll get a 47R later from the local electronic shop.

 

[anevilspar7an]

Swap with R6 if you want it done now, otherwise the other option is to wait for a component refresh.

 

[eh là bas ma]

Swap with R6 if you want it done now, otherwise the other option is to wait for a component refresh.

Can i ask why R6 and what does it do in the circuit ?

If im not mistaking, the power filter resistor helps with noises coming from the power supply, so if i use a silent power supply the difference should be barely noticeable ?

From what i could gather, this resistor is paired with a cap and it creates some kind of low-pass filter, so a 32R will only slightly shift the cutoff frequency, am i wrong ?

 

[anevilspar7an]

The 47R in the power supply forms a low pass so high frequency noise is filtered out. I would use the 47R in the power supply but if you have an isolated DC source you can chain your 22R and 10R there.

 

[jwin615]

R6 forms a 1.5k low pass in the feedback loop.
32R would shift this up to 2.2khz. That's a half an octave shift. Not huge but not minimal.