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Good day!
After rummaging into some literature...
I reconsidered my potential range...
it's now 800k ohms - 10 M ohms.
I came up with this
which was in alignment with these
green = V+_input; red = V-_input
green = V+_input; blue = Vout
Sorry for the late reply..
I thought it through.
I'll have 9V as Vcc
but I have to make sure that the output will not exceed 5V (Arduino input pin can only accept up to 5V)
the resistance range will be (according to my readings) 100k ohms - 10 M ohms
follow-up question...
about the filter for the output signal
can I use typical parameters or
a new custom design is needed since the signal that will be filtered is already amplified?
by typical parameters I mean the standardized ones
commonly used in the application of my circuit
time...
I think I will proceed with using just a Vcc...
Right now, I am thinking of using 9V supply for the op-amp
The output (hopefully filtered) will be fed into Arduino where it will be analyzed
- - - Updated - - -
I think I will proceed with using just a Vcc...
Right now, I am thinking of using...
Thanks for guiding me through...
I am afraid I didn't understand why the voltage supplied on the skin is Vref = 500mV as I got confused with the statement you quoted previously
I temporarily took R1 from the circuit
I did my homework and I think I have an idea why V_R1 = Vref...
*negative...
I am trying to implement something similar with item 3 from this link
**broken link removed**
The 1M resistor is a substitute for a sensor that will measure skin conductance (1/R).
For testing purposes, I placed the 1M resistor there whose value is within range of typical skin resistance.
So...
Just for clarification, we're you referring to figure 1 (1.PNG) ?
The op-amp is LM358 by the way.
Thanks for the explanation about the voltage divider principle between the 1M and 10k resistors.
It gave me a different perspective about the circuit.
Actually, what I intended to implement in...
Good day everyone!
I am in need of an amplifier that can provide 0-5V output
of the voltage equivalent of the current I need to measure..
initially I had
in which I had a 46-49mV output...
I am planning to input this to Arduino
so I thought I still need to amplify this
so I added an...
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