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Hello,
I have a little problem that I don't know how to fix, if fix is needed.
I have a small control board that control a motor, a pump and a linear device (like car electronic door unlock device). It can happen that the end user would turn the motor manually. When the motor is turned in...
Hello,
I was using a GS-R400V in one of my design. This part is now obsolete and unable to find anymore.
I plan to design a replacement for this part. I already found buck controller ( LM2678 ) but there is a little something that scare me. Let me explain my needs :
Input : 24V
Output ...
Hello,
I'm facing a big dilemma and I cannot find the answer by myself.
I have an array of different sensor. To ease the computation I plan to use the sum, the mean of
those sensors or use root mean square or some other method to group the sensor response in one
global.
By doing that, I...
OK, I'm back on the project, here is the output vs input. (green input, yellow output)
The opamp is unity gain, with an RC filter, the signal's output noise level is similar (seems to be my oscilloscope internal noise).
I did a small test, I switched the probe on the scope.(now the green is...
I'm sorry, I'm not working on this project, but will continue soon. I will post a new in vs out waveform. I have some problems understanding how the bitscope interface works...
Thanks a lot again for your reply!
Here is the scope floor noise. (1mV/div 5ms/div)
You are right, the noise on both signal are measurement artefacts. (I use a low end bitscope (BITSCOPE = PC OSCILLOSCOPES AND ANALYZERS))
The OP I use has a 900KHz bandwidth. I'm not sure to understand how you...
I changed the opamp for an OP97FSZ I think the signal is better, but not much. So, now I am convinced that the problem is not the opamp itself.
You can see the waveforms below.
both are :
1mV/div
5ms/div
Left is op amp input, right is op amp output. I changed the voltage divider (I use 1K...
Thank you FvM for your quick reply. I will try that this evening.
Thank you a lot.
I wanted to buffer the voltage divider because the signal goes into 4 opamp.
Thanks FvM.
I will post some waves this evening to show you what I mean by very noisy.
Regarding what you have said :
what do you mean ? I should try to reduce the resistor ? Which value would be acceptable and why ? Is it because the current will be very low ?
Thank you very much!
Thank you for your reply,
You are right, the component is not LT1197 but LT1097. I will correct the first post.
Why the noise (edit 10k) would be high for low noise ? can you elaborate a little bit more please? Is it because the current will be very low so?
I use a voltage divider (9.99Mohm...
Thank you for your comment.
In your experience, is my supply is suitable ? I mean, does 5mV of noise on my supply is acceptable for my application ?
I will try the LC filter. Thank you.
Hello,
I did not designed analog circuit for long time (I was more on digital and firmware side).
But now, I have to work on a project which require +-1mV sinusoidal (low frequency, 200Hz or less) signal then I have to do some other steps, but the problem is seen at the first stage.
first, I...
diode marking code
Hello,
I broke a device and one diode broke ( was a protection diode ).
I'm trying to figure out what is that diode but I'm unable to find that information ( I did sent an email to ST but no answer so far). The marking on the top of the diode is : ST
CUH
C732
Is anybody...
h bridge transistors
Hello,
I'm about to build an H bridge for a buzzer.
I find the following circuit very interesting, but I will not use the opto-coupler.
I was wondering why the pnp transistor were at the top ? I build one from myself and I putted the pnp at the bottom of the circuit...
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