Search Engine

98 Threads found on Sensor Opamp
Hi. I am using IL300 optocoupler for my voltage isolation (except 1 output voltage value rest all linear to the input). I want to use the same for current sensing and connect it to my ADC. I am not sure if for the current sensing its the same circuit as mentioned in the datasheet under typica
I have a few questions regarding High pass and low pass filters when calculating a pulse rate. Why is it that in this link, The cutoff frequency is set to 0.5Hz? Why did the capacitor and resistor be chosen for the HPF? Also why does the gain and cutoff frequency have to be 48 and
Hello every one, I am working for a project , in which i should develop a sensor interface circuit to find impedance when using a TDC. Impedance range is upto 1Mohm . Input frequency is upto 1 Mhz. for find the impedance , Phase information and Amplitude should be extracted when the excited with a sinusoidal signal (till 1MHz). Phase infor
Hi, It is a MUX. 0: measure excitation current across 100R 1: measure sensor output signal 2: zero. (I assume for offset adjust) 3: unused. Klaus
The input resistance of your inverting amplifier is 1k ohms which attenuates half of the input voltage from your 1k ohms sensor that needs a load of at least 100k ohms. That is why you were told to add a buffer between the sensor and the inverting opamp circuit because the buffer can have an input resistance of 100k ohms or more.
1. I can suggest you to use an opamp with very low input offset voltage (also known as Chopper or auto zero or zero drift. the name varies with manufacturer but the functions are same). Non of the opamp which is embedded into the microcontroller will suitable to interface your sensor (except Cypress PSoC controller wich is very much (...)
my load cell sensor outputs 0-10v, but my dspic controller accepts only 0-3.3v adc signal only, how can i convert using opamp kindly help. thank you
Hello Everyone, I need to design an Operational Amplifier as an Instrumentation Amplifier for a sensor and the output of the sensor is 0.1 to 0.5 Volt. The Technology is 180nm with 1.8 volt as Vdd. Please help me in writing the specifications for the opamp and opamp architecture i should choose. Thanks in advance.
How to design an opamp Circuit for pH sensor which will be interfaced to PIC. The PH sensor gives 420 mV for 7pH and -420 mV for 14 pH. I need to design an opamp Circuit using 741 or LM358. How can I design the opamp Circuit. Further the output of the amplifier will be input to ADC of PIC for measuring the pH.
The input resistance of an opamp is important if you use a very high impedance piezo vibration sensor that has its low frequency spec's with loads of 5M, 10M and 1G ohms. At the very low frequencies of vibrations then the resistance is the same as the impedance.
Hi all, I have a low to medium level of understanding electronics. Playing with LTSpice is fun but not enough for me to make steep learning progress. Here is the problem, I ask you to help me with: A sensor with an output swinging between +3 und -3 V should be connectet to an ADC. The ADCs reading range ist 0 to +5 V. I am only interes
Can I use the famous IC741 opamp? The one labeled V- , is that V+? What would be a the best value for Vref? I presume, the bias voltage polarity is meaned as shown in the schematic. It has been BTW copied from a competitor's application note :grin: The voltage level is specified w
Not quite sure what you're trying to do there, but it looks like there's a lot wrong. 1) You've got a diode in series with sensor output which will allow only negative signals through, but your opamp is referenced to ground. I think you want to turn that diode around and maybe put a resistor to ground on the opamp input. 2) Your (...)
Use a thermistor (PTC) as temperature sensor and an opamp as comparator (with a potentiometer on the non-inverting input as reference voltage). Once temperature exceeds a value set with the potentiometer, the opamp's output will go low and can switch off a relay that is connected to your lamp. Simple circuit, $2 worth of components.
As the sensor is being used, the capacitor will help in smoothing out the signal. This will function like a low pass filter.
Hello Guys, Firstly, I am new here, so please be forgiving to me :) I am trying to design a comparator for CMOS image sensor ADC. Below you can see schematic of the testbench and waveform with results. Architecture of comparator, it is standard 2-stage opamp with high gain, without hysteresis. Operation of this circuitry should be like this:
I connect LDR and PIR sensor to input of Transistor And Gate circuit and connect 4 LED 12V 1W to output . But LED is alway bright. when have no input from both sensor LED is little bright. So, I pull out input from LDR. when somebody pass PIR sensor it's more bright . And If have input from both sensor it's most bright. I (...)
Hi, I would like to design analog circuit that will detect signal from pH electrode senor and sent it to micro controller. I need analog circuit which process sensor electrode signal into ADC, from ADC to micro controller. I am thinking about Instrumentation amplifier to get low voltage dc signal from sensor electrodes. I am confusing wit
I am using ACS712 hall effect current sensor. It gives 66mV/A. I am using ADC0808 to read the value of AC current passing through real load. Now the problem is that ADC0808 reads the analog values but i need the peak value of current. How can I read this signal with
Your analog meter measures CURRENT; your ADC measures VOLTAGE. So, it would seem that the simple approach is to hook everything back up the way it is in the top picture, and measure the voltage at the junction of the meter and the sensor. Get rid of that 3K resistor on the opamp input.