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  • Hear With Ultrasound Using a DIY Flanagan 'Neurophone'

    Maybe the diagram is not ok, and one output(pin 9) goes to the first transducer + and the other output (pin 10) goes to the second transducer + . Here is a link to a ultrasonic directive speaker circuit in wich the TL494 is like this one but the otputs goes like I said.https://www.homemade-circuits.com/making-ultrasoni...Anyway I will build it and post the result.

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  • How to Make an Inexpensive 16 MHz Arduino Oscilloscope Using Excel and Your Computer Screen to Display

    Hello nice post, I built the osciloscope with only TDA8703 and Arduino without the first 4 steps, but when I conect it to a Radio Emitter circuit, the ADC says high with 255 all the time, but when I conect it to a Inductane meter with the same frequency ( same capacitor and inductance) and LM311 IC it takes the signal OK, but a rectangular wave, but I want to know if the signal from the rf emitter circuit is a sine or rectangular shape. So, Do u know what of the steps, atenuation (voltimters says 5,3 at the antenna), bias, impedance could be that is giving me high all the time?. Another thing, I did not conected the clok (7,5 MHz was the cheapest) to Arduino, just to the ADC, and sent 1600 bytes packets with the time to read them in microsecs to VC++ MSCOMM.

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  • LuisA350 commented on Jestin_Cubetech's instructable Simple Mobile Detector Circuit7 months ago
    Simple Mobile Detector Circuit

    The 0.22 uF ( 220nf )ceramic capacitor that acts as the antenna exits ?. My electronics store seller said must me wrong, Can I use polyester?.

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  • LuisA350 commented on cah6's instructable DIY EEG (and ECG) Circuit9 months ago
    DIY EEG (and ECG) Circuit

    Now u have the hardware from mind reading, take a look at senteces recognition by brainwaveshttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC28135/

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  • LuisA350 commented on cah6's instructable DIY EEG (and ECG) Circuit9 months ago
    DIY EEG (and ECG) Circuit

    This is the result of DIY AD620 with the notch filter and low pass filter above with 5 cents coins. These images are from the PC, on the laptop there is less noise 50 hz because I used a shorter cable. Is there is too much noise that will affect on the appending Inverse FFTs, so less noise better, so if u want to put another notch and the end or replace the one with UAF42 that will get better signal, but this one looks enought because if ther is not to much noise u can cleare it by software Inverse FFT. The last image is the last amplification, for ECG and EEG Thanks to DIY for giving us I starting point for the work.

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  • LuisA350 commented on cah6's instructable DIY EEG (and ECG) Circuit9 months ago
    DIY EEG (and ECG) Circuit

    Also for low pass this one is really good. I tested with the same program and is much much better that a simple or second order low pass. Also the upper notch and this low pass were tested with ecg signal and are really goodThe values of the picture are for a cut off of 40 hz. Let the capacitor let as they are if you want to make it for 60 hz, and change the resistors using that equations .

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  • LuisA350 commented on cah6's instructable DIY EEG (and ECG) Circuit9 months ago
    DIY EEG (and ECG) Circuit

    This Notch filter seems better, also have a calculator for 50 HZhttps://www.changpuak.ch/electronics/Active_Notch_...I made a programm for testing sending 5 hz...10hz...20 hz.. etc connecting the outut sound card to the notch filter and to the mic, and the results from this filter is better that the the one above from oskar15 and the one related in this page. I dont have place to upload the soft, but if you want it let me know and i send u. Here is an image comparing DIY EEG filter with the one i suggest. It looks like the DIY atenuates to much so noise can enter. I used 100 nanos and 95% feedback in the changpuak calculator so I get bandwith 10 and Q=5.

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  • LuisA350 commented on cah6's instructable DIY EEG (and ECG) Circuit10 months ago
    DIY EEG (and ECG) Circuit

    Here is a good page with circuit and calculator any hz notch filter. U can adjust the Q quality factor for the bandwith in a active T notch fiter. Bandwith = freq / Q, so Q=5 looks good for 10 HZ bandwith, but better use mulltiturn variable resistors so u can find the best configuration.https://www.changpuak.ch/electronics/Active_Notch_Filter.php

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  • LuisA350 commented on cah6's instructable DIY EEG (and ECG) Circuit10 months ago
    DIY EEG (and ECG) Circuit

    a variable resistor. Put a multiturn one so you can adjust better the ohms. Anyway I am making this circuit but with filters from other pages because these ones doesnt work well in my computer experiments

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  • LuisA350 commented on cah6's instructable DIY EEG (and ECG) Circuit10 months ago