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Scaling down the op-amp resistance isn't a good option for me cause i'll have to use a 0.6uF capacitor with the scaled down resistances to maintain the cut-off frequency but 0.6uF is not available at any store.
But why do you say that with LM358 i don't have to worry about resistor noise...
Guys this is my circuit
Its actually a heart beat monitor. It works on the principle of density modulation. When the heart pumps there is an influx of blood into the tip of the finger. This leads to a decrease in the light received by the infrared sensor. Im amplifying the voltage drop...
Sorry Keith i don't understand. Actually im a newbie to circuit designing. I can't visualize the low pass filter from the circuit diagram. I mean where should i assume the noise source to visualize the filter? The noise source should be below the skin resistance right to form the RC low pass...
I'm constructing a low frequency AC amplifier using a LM358 dual op-amp and i want a gain of 100. For this im using a 1M resistor in the feedback path and a 10k resistor in the input. But some people advised me against taking a high valued resistor in the feedback path saying that it will lead...
I understand that it is acting as a filter but i cant understand the mechanism. Can you please explain that to me. The upper half has a resistance and a capacitive reactance in parallel and the lower half has a fixed 1M resistance and a variable skin resistance in parallel. Up to this i...
Thanks Brian for the explanation i understood the resistive voltage divider part and the unity gain buffer but what is the capacitor doing here? How is it affecting the voltage input to the buffer? Please give detailed explanations and equations regarding the role of the capacitor. Thanks in...
This is a circuit for measuring the skin resistance of a person. The resistance is converted into voltage and fed to a microcontroller.
The two dots represent the electrodes which the subject will touch with his fingers. The voltage follower on the right is used as an impedance transformer. Now...
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