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 91 
 on: February 15, 2024, 08:14:54 08:14 
Started by swiper - Last post by swiper
CountrySweden
NoteEmbedded C
I found interesting links here
Hobby and job

 92 
 on: February 12, 2024, 09:01:16 21:01 
Started by Jana - Last post by Jana
CountryHungari
NoteI deal with PIC, ATMEGA, PLC programming.
Building unique machines and renovating machines is my hobby.
Electronics is my livelihood and my hobby.

 93 
 on: February 12, 2024, 07:30:34 19:30 
Started by Sideshow Bob - Last post by Nuclear__
If it’s not for professional use , but you only want one piece to do your work,(like my case)I would suggest to buy from Ali a filter (including common mode chokes) for this purpose.you can find up to 20 amps capacity in good price. I’m still waiting it so not tested yet , but looks promising

 94 
 on: February 11, 2024, 08:04:37 20:04 
Started by especialista - Last post by Sideshow Bob
I would rather see this as pink noise audio noise generator. It can have it's uses by all means

 95 
 on: February 11, 2024, 06:36:34 18:36 
Started by especialista - Last post by PM3295
Noise source circuits appear to be simple in operation, but there are much more to designing noise sources. Noise source can be used with a spectrum analyzer to characterize filter shapes as an example. For a noise source to be useful, it needs to be flat (+- 0.5 dB) over a wide frequency range. That is easier said than done.
No wonder if you look at any of the HP/Agilent/ Keysight noise sources, they are very expensive. It is not easy to get a source with a flat noise output over a 10 MHz to a couple of GHz. The noise outputs of calibrated noise sources are typically specified in dB ENR (Excess Noise Ratio). They generally also terminate into 50 Ohm. Once you know the calibrated value, you can do NF (Noise Figure) measurements on amplifiers, mixers, etc.

Since the noise level used for measuring noise-figure is often very low, you need to make sure that you eliminate any outside interferences that can corrupt the noise measurements. The noise level we are talking about is low enough that you can’t observe it on a spectrum analyzer since the noise output is often less than the noise floor of the analyzer itself. To observe it on the analyzer, you need to amplify the noise with a low-noise amplifier with gain around 40-60 dB first.
This subject can get mathematically very complicated and there are many articles and books dealing with noise written.
You can read more on the applications of noise sources, with measurement in the link provided.

http://hparchive.com/Application_Notes/HP-AN-57-2.pdf
https://www.hpmemoryproject.org/an/pdf/an_57.pdf

 96 
 on: February 11, 2024, 05:15:00 17:15 
Started by especialista - Last post by especialista
Hello dear friends!

This circuit produces an electric signal without a definite frequency at J2, the so called "White Noise".
See https://en.wikipedia.org/wiki/White_noise for further information.


How does it works?

We force Q1 to work at breakdown region of operation (transistor basics), putting a lot more of reverse voltage on its emitter compared to its base. The thermal noise generated on Q1 junction is amplified at Q2 and put to use.

You can use any NPN transistor you like, remembering each transistor produces a kind of different noise, and maybe requiring adjustments on its bias.
The gain for the amplifier stage is set at R3. I recommend no less than 100k. The higher value of R3, higher will be the gain.

In this configuration, at 13.8v, you can get about 3.5 to 4v peak-to-peak of noise.


 97 
 on: February 08, 2024, 08:28:01 20:28 
Started by JaniD++ - Last post by JanID++
Thank you for invitation. Registration is done.



Note: This message sent by the system behalf of JanID++.

 98 
 on: February 08, 2024, 06:41:40 18:41 
Started by shasse - Last post by shasse
CountryMaroc
Note hi all
I am an electronic repair and diagnostic technician
car
I have 30 years of experience in embedded electronics
I can help others and share my experience
this is my job

thanks and have a good day

 99 
 on: February 08, 2024, 06:06:33 18:06 
Started by JaniD++ - Last post by pickit2
This member is invited by me. Registration isn't completed yet.


Note: This message sent by the system behalf of pickit2.

 100 
 on: February 08, 2024, 01:52:31 13:52 
Started by JaniD++ - Last post by JaniD++
CountryHungary
NoteI am a hobby pic programmer since '99. :)
Making codes mostly in C, but sometimes in asm as well.
The microchip's forum doesn't looks like really helpful.
Maybe here i can get more friend to help each other...

Cheers from Hungary
Janos

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