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==March 08 2017== Debugging the brainduino v0.1_foo ... One of these resistors is not like the other. R15 is upside down ? A 4.02 KOhm resistor. (John wonders if this is a correct value for setting op-amp gain anyway, given the corresponding 1 MOhm resistor in that part of the circuit.) R17 the same ... maybe not upside down afterall. Jade observes that neither R15 or R17 have any visible printing on the side facing up, unlike any of the many many other resistors on the board. Hence the initial speculation as to its potential upside-downness ... Breaking out the multimeter now ... Here we go ... What's going on with this multimeter ? Now reads 4.01 KOhm on R15 same on R17, very good. The feedback resistors R16 and R19: R16: 1.001 MOhm R19: 1.001 MOhm C35 difficult to get consistent reading of capacitance (maybe due to rest of circuit not isolated) C36 11.85 nanoFarads ? Also not consistent .007 nanoFarads ... 0.4 ... 2. ... 1. ... 0.006 ok, we want 0.047 nanoFarads ie 47 picoFarads as specified in schematic but we never see that ... but that's okay, because measuring capacitance in circuit is a fool's errand. backing up a bit ... R3 tests within 2% of 1 MegaOhm despite being GROSSLY OFF CENTER R4 1.000 MegaOhm feels more solid than R3 should we resolder R3 ? John would (if not feeling adventurous) read documentation and study IC 1b and IC 1a ... Dan, feeling adventurous, reads Masahiro's instructables article which is full of win, and yields A CLUE as per corner frequency of the EIGHT POLE BUTTERWORTH FILTER: "1/100 of clock is filter high cut frequency."
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