Impossible.fixed current and fixed voltage output
Again not possible.The output will have one jack for electrode.
How will you get 5mA to flow? By increasing the voltage. 3M x 5mA= 15 thousand volts! And your circuit must keep the current from exceeding 5mA even when the voltage is 100 thousand volts or more.
Silly, isn't it?
In case your definition of output_voltage and output_current both are the values to stimulate nerves:This formula means it can be done. But with controlling the resistance.
Have some practical ideas:
Voltages produced in common nerve signals is (usually) less than 1V.
The currents involved (depends on the nerve size) is of the order of microamps.
Is you device is going to be used for research or for other medical application?
To measure the voltage, you need to make contact with the solution inside the nerve.
The other electrode can make contact with the solution outside (commonly a buffer solution).
The voltage and current values you are talking about does not make sense.
- I've seen devices that uses more than 1v it could reach 50 volts like TENS machine.
Hi,
In case your definition of output_voltage and output_current both are the values to stimulate nerves:
(Otherwise, please clarify the meaning of your values)
I'd like to know how you want to control the (skin) resistance of a body.
As this is the only way to fulfill your requirements of post#1.
*****
For sure you can build a variable resistor inside the device, but then still you are not able to control output_voltage and output_current at the same time to two desired setpoint values.
Klaus
If you are applying around 50V, using electrodes (similar to the ones used in ECG electrodes) with a salt gel, you may experience severe pain and it can also cause heart failure.
-Why do mean to control the resistance of the body?
Impossible. You can´t ignore Ohm´s law. You can´t ignore physics.-What if i build two circuits one to limit the voltage and the other to limit the current, in that case i'm not able to reach the desired set-point of both the current and the voltage at the same time?
-What if i build two circuits one to limit the voltage and the other to limit the current, in that case i'm not able to reach the desired set-point of both the current and the voltage at the same time?....
-What if i build two circuits one to limit the voltage and the other to limit the current, in that case i'm not able to reach the desired set-point of both the current and the voltage at the same time?
So, why do you ask? Are resistors too simple?I know resistors can be used.
You did not do a simple search on your own...otherwise you already know "buck converter" and "boost converter".is there any thing other than that with less heat to use in a circuit to get fixed variable output voltage?
Hi,
So, why do you ask? Are resistors too simple?
Klaus
You did not do a simple search on your own...otherwise you already know "buck converter" and "boost converter".
Klaus
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