Typo on the RC network

[gajjer]

The text says that the low pass filter is set by R3 and C9. I think from the circuit diagram above the text, this should be R8 and C9. Actually R8 in parallel with R7 but since R7>>R8 it's near enough.

Thank you so much for writing this guide. Really useful.

[Joerg-rw]

yes, it's obviously a typo.
s/R3 = 1k/R8 = 1k/