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==March 21 2017== Q&A with Masahiro! << We are making progress on our Brainduino V0.1 assembly. We think we isolated the abnormality to IC3, the low-pass filters. We observe 10,000x gain out of the first two rounds of amplification. Our understanding is that 10,000x gain amplifies a +/-50uV brain powered signal to a +/-0.5V signal, within the operational range of the Arduino ACD. >> Maybe not easy understanding of so many option setup. We use option A. OPA2111 set gain X 100. AD8422 use as Gain X1 ( no need put R5 & R6 to AD8422 , because we use option A ) How to get X100 : R23 (100K) / R27 (2K) = 50 R24 (100K) / R27 (2K) = 50 50 + 50 = 100 Then IC3D set gain X250 How to get X250 : 1 + (R16 (1M) / R15 (4.02K) ) = 250 (249.75622) Total : X 100 X 250 = X 25,000 It is not X 10,000. C15 : 1 µF makes 0.16Hz low cut ( default ) C15 : 0.1 µF makes 1.6Hz low cut. C35 : 47 pF makes 3200 Hz high cut ( default ) C35 : 1 nF makes 160 Hz high cut Need setup for other channel too. [[File:Brain-duino_circuit.png]] <<Coming out of the first and second round of filters in IC3 on both channels we're seeing our signal clipping at +/-12V. Is this expected? >> From IC3 output, max clip is +-12V. Usually not clip to +-12V. In case clip continue then not working. Make sure solder jumper : SJ8 : 2-3 connect is default. C46 1µF is option. default is put 0 ohm.
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