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Hello,
I want to use a transistor to act as a switch and send alarm signals.
I want the transistor to be always ON and close whenever I receive an alarm.
My question is will the transistor have any problem operating on this configuration for a long time?
I expect that it will be ON for a long...
Hello,
Thank you all for your replies.
I have been testing an LM35 sensor and a common npn transistor.
The difference in normal conditions is that the pnp transistor shows approximately ~3-4oC degrees more than LM35.
When I heat them with a thermal source, I see that the common transistor...
Hello,
I am using a BC547 transistor and a BC548 transistor as temperature sensors.
I see that there is some deviation compared to air temperature, between 2-4 oC and that the temperature sometimes increases for ~4oC.
Do you know the temperature accuracy of these transistors? Is there a way...
Hello,
I have already tried that.
However, the relay is connected to an alarm system, so this spike is recorded as an alarm.
So, I was looking for some alternatives.
Based on the above, it seems that the only other way is to completely replace the relay.
Thank you
Hello all,
I am using a relay OMRON G5V-2 that its datasheet states:
Long-term Continuously ON Contacts
Using the Relay in a circuit where the Relay will be ON
continuously for long periods (without switching) can lead to
unstable contacts because the heat generated by the coil itself
will...
Hi,
It's been a long time since I posted here.
I solved it:
F=A'BC'D+A'BCD'+AB'C'D+AB'CD'+ABCD=
=(A'B+AB')C'D+(A'B+AB')CD'+ABCD=
=(A'B+AB')(C'D+CD')+ABCD=
=(A XOR B)(C XOR D)+ABCD
Using Karnaugh Map, I should find F' using zeros in the table and I could find the same result.
Thank you
Hello,
I am reading about VDSL2 band plan here https://www.joepeesoft.com/Public/DSL_Corner/DSL_Spectra_VDSL2.html#BandPlanEUR_997
and I see that downstream uses lower frequencies than the upstream.
However, the Upstream line attenuation seen in the router is lower than the downstream...
Hello,
I am trying to simplify the following expression:
F=A'BC'D+A'BCD'+AB'C'D+AB'CD'+ABCD
However, the Karnaugh Map doesn't show any pairs of ones.
Are there any suggestions?
Thanks
Hi,
In adaptive coding and modulation (ACM) the modulation and coding change, according to the channel conditions.
As I understand, the useful information throughput is changed: when the channel is "bad", the coding bits increase and when the channel is "good", the coding bits decrease...
Hi,
I am considering a Linear Time Invariant (LTI) channel model and whether it causes time and frequency dispersion.
Since, LTI systems don't introduce any new frequencies to the output, they don't cause frequency dispersion.
But what about time dispersion?
In wireless communications...
Hello,
I solved an exercise regarding the TCP congestion control algorithm and I want your feedback
because I have a few questions.
The exercise says:
Given that MSS(Maximum Segment Size)=2KBytes and the Congestion Window at the time of a timeout is CongWin=36KBytes,
find CongWin after 5...
It seems like the problem is solved:
The scaling property does not hold for discrete sequences, as I have in my exercises.
Therefore, the correct solution for the discrete case is just with the exponential.
Thank you for your help.
I am applying this property https://en.wikipedia.org/wiki/Dirac_delta_function#Scaling_and_symmetry
where it seems that the number 5 should go into the denominator.
Also, I computed the Fourier transofrm in Wolfram Alpha and got this result...
Hello,
I solved an exercise, asking for the Fourier transform of the signal \[\delta(9-5n)\].
First, I changed the signal form:
Because delta function is symmetric, I rewrote it as \[\delta(5n-9)\]
and then I used the scale property: \[\delta(5(n-\frac{9 }{5 }))=\frac{1 }{5 }\delta(n-\frac{9...
Hello,
How do we remove the bias from an equalizer, either time domain or frequency domain?
Any code example would be useful to get the idea.
Thank you in advance
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