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Beginners / Checking for noise in resistors
« Last post by Calambres on Today at 04:45:59 pm »
What's the best way to check for noise in resistors?

I'd like to test old carbon resistors used in high voltage circuits, i.e.: old vacuum tube amps and the like.

Is there a testing jig and/or testing circuit I can build to check for that?
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Other Equipment & Products / Re: New Aixun T380
« Last post by SteveyG on Today at 04:45:59 pm »
edit: better be an earth port on this I don't see one in the photos  ???

No ESD point, I missed that.
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Other Equipment & Products / Re: New Aixun T380
« Last post by SteveyG on Today at 04:44:55 pm »
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RF, Microwave, Ham Radio / Re: High bandwidth FM signal generation
« Last post by A.Z. on Today at 04:44:02 pm »
are you trying to build a cell phone "blanker" ?!?
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Hi Niall135,

Sorry to hear that the camera resisted your attempts to revive it.

I bought a BF5421 a while ago. Nice camera with a 400 x 300 pixel VOX FPA  :-+

With regard to parts of the Series 80 camera that would be useful to me, the ape icon tube might help me revive a French Thermocam  that I have.

All the best with your Series 80 conversion project  :-+

Fraser
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Test Equipment / Re: Multimeter selection for production testing
« Last post by mawyatt on Today at 04:42:41 pm »
I kid you not, we found a 34465A, that was connected to a test setup, and was doing nothing.  :-DD
Production people didn't even turn it on anymore. Anyway, I was kind of looking forward trying the SDM3045X/SDM3055X. I guess next time.

Keep looking around you may find a KS3458A also connected that they forgot about  ;D

Best,
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Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by wasedadoc on Today at 04:42:25 pm »
1) oscilloscope is not properly BW limited, so Sinc filter is unable to reconstruct perfectly, instead of nice sine, it creates AM sine.

140MHz is below Nyquist.
Referring to the photo in post #436, one cycle of the undulation frequency occurs every 5 cycles of the  varying amplitude 136.17 MHz which makes the undulation 27.234MHz.  So one sideband is 136.17 + 23.234 which is 163.40 MHz. That is more than half the 312.5 MHz sample rate.
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Microcontrollers / Re: RIP Z80
« Last post by coppice on Today at 04:41:32 pm »
I think most MCUs are designed for a specific automotive or other consumer application, against a customer requirement for say 10M chips annually. This is pretty obvious with some chips like Siemens ones that go into ECUs but you rarely see them generally.
That used to be a common practice, but things have changed. Producing a new die is now so expensive vendors want to develop MCUs that can potentially cater to a whole application segment, rather than a particular customer. So they tend to survey customers, and try to figure out a feature set that will have broad enough appeal to capture a number of big players in that application space. Then they make the chip and offer it in their catalogue. This has created some interesting brinkmanship dynamics. Leave out one pin needed by some of the big players, and you can be out of the market. The few cents of extra hardware needed to simulate that missing pin can kill your chances. Throw in a few too many things, and pad out the pin count, and you might be too physically big or too expensive.
But since almost nobody doing that is posting here (not allowed to, for a start) we are talking mostly about lower volume stuff.
You'd be surprised. A number of people here either work or used to work in high volume stuff.
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Repair / Re: Lecroy service manual for SDA6020 or Wavemaster 8600?
« Last post by speclab on Today at 04:41:15 pm »
I'm in need of the Wavemaster 8600 service manual also.
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Test Equipment / Re: Choosing between entry-level 12-bit DSOs
« Last post by 2N3055 on Today at 04:37:40 pm »
All 4 channels on.
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