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Hey thanks for the response,
It explains the behavior I was observing, however I'm not sure how to use Figure 2 in my case. As you can see from my attachment, it does not really have a load. I just want to short circuit +20V and input A. This is an enable signal that is going to the motor driver...
Hi,
I am trying to make digital switch circuit for an old motor driver, that can be controlled by Arduino. Motor driver is pretty old and it's like a black box for me at this moment, but based on my tests I have put out the requirement on the picture attached.
Basically, arduino should close the...
Sorry I did not update the thread.
We tried the same circuit on a bread board with LM324 opamp and everything seems to be working fine. May be godfreyl is right; It might be something to do with the layout. At this point we are just using the breadboard setup. Let's see.
Thanks for the...
Test1
OK
Opamp - New
R5 Removed
C2 Shorted
inputs grounded
Outputs are measuring 0. However opamp is hotter than before; shows 0.05A on the supply. Actually when the board is powered, it shows 0.005A for two seconds, and then all of a sudden increases to 0.05A, and makes it hotter.
Test 2...
I bought them through digikey, so chances are its not fake. I do think that it is defected too. But, as I said before I'm trying to understand and learn the reason before I swap the new one. I was running the circuit with a lab supply, so the power applied is pretty clean.
- - - Updated - - -...
Ok, now that makes sense. I was not aware of the thermal resistances stuffs. I should agree I am a noob for practical op amp designing. Thanks for sharing the knowledge.
However, I'm wondering how's this related to the ~13v output we are measuring w/o input.
Also, how do I deal with this...
Thanks for all your replies, I'll go and try your suggestions today. I'm wondering whether opamp is till working condition.
I actually triple checked the board, and there are no short circuits. Also at this point the final output form the opamp is not connected to anything(load).
Here is...
Hi, or
First of all, I apologize for riposting this. Initially I posted under different category, I'm not sure how to delete or move the old post.
<- This is my original post.
Now my problem:
I am trying to make a circuit that would convert a pwm signal (0-5v) to a 12v to -12v analog signal...
Your theory is absolutely correct. And it's my bad i didn't have the diagram proper. Because as i said before my area of concern is not on the sensor, i wanted to clear out the filter combination with amps.
But, yea FYI, the photo diode is reverse biased in practical, and how much voltage...
Sorry, i had to answer a call while i was replying.
---------- Post added at 16:35 ---------- Previous post was at 16:26 ----------
Ok, first of all i really appreciate all of your helps, but just calm down, i was going to reply the rest of the information to LvW's reply, because his...
@LvW
Thanks for your reply,
It's a dual +/-5 supply, FYI, I'm using that +2.5 offset for two reasons, since its a transmittance the out put of the op-amp will swing between 0 to -5, so I'm making it systematic besides there are some switches involved which I haven't showed here , to compensate...
Hi,
first of all I'm really sorry for a bad diagram, plus I'm fairly new for analog designs.
I'm trying to design a instrumentation circuit for a color sensor. In order get the maximum accuracy out of ADC i had to use two stage amplification. I somehow managed to get this circuit, but I'm kind...
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