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Beginners / Re: Checking for noise in resistors
« Last post by coppercone2 on Today at 11:20:02 pm »you can make a 300V battery using coin cells. You need alot, it needs a good 3d printer, and you need plastic tweezers.
Recent Posts
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Beginners / Re: Convert US standard 115V to International 230V
« Last post by Jwillis on Today at 11:17:22 pm »Capacitor ESR decreases as frequency decrease and ESR increases as frequency increases. So whether it 50 to 60Hz or 100 to 120Hz it won't make any difference worth worrying about to output voltage ripple. This can be easily tested with any LCR meter with variable frequency. If your getting a huge change in value between 50Hz and 60Hz then the capacitor is nearing end of life anyway and needs to be changed.
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Security / Re: Microsoft repackages apps with a telemetry .NET wrapper
« Last post by radiolistener on Today at 11:15:50 pm »Actually you can.
Unfortunately Windows has a lot of different telemetry subsystems and some of them are hardcoded into kernel DLL's and cannot be removed or disabled. It has a bunch of hardcoded IP's and DNS addresses to collect the data, so it even hard to configure firewall to block them all.
But you can still run it without telemetry if you turn off ethernet cable and wifi adapter
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Buy/Sell/Wanted / Re: The Bad Shopping Experience Thread
« Last post by ttx450 on Today at 11:15:08 pm »Scam warning. I was scammed in the sell/buyer thread by this person purchasing a Leader 3217. It was finally resolved by paypal on my end. I hope Admins will back list him, not sure where to post this?
M3Knight - EEVblog user name
harveygrout75@gmail.com - Another Email account
markevans56@yahoo.com - Mark Evans is the paypal recipient
M3Knight - EEVblog user name
harveygrout75@gmail.com - Another Email account
markevans56@yahoo.com - Mark Evans is the paypal recipient
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RF, Microwave, Ham Radio / Re: Transistor tester
« Last post by coppercone2 on Today at 11:15:07 pm »you should try this in the repair forum since a germanium transistor is a device present in much more stuff then radios. the audio people know, and people are VERY concerned about their germanium transistors
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Projects, Designs, and Technical Stuff / Re: 3D printing company similar to PCBWAY for circuit board
« Last post by Someone on Today at 11:14:49 pm »then you discover subtractive metal enclosures are about the same price....
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Test Equipment / Re: A look at the Uni-T UT210E
« Last post by ceut on Today at 11:14:03 pm »Time has passed since my contribution here...2017 
A quick follow up of a problem of one of my 2 UT210E (the one I have given to my brother).
I have to fix his FAAC D600 motherboard (from a motor garage door) which has failed and some burned part on it.
So, after having fixed it at home, I have gone to his home, and when I have rechecked the power voltage line, his UT210E reads 51V DC
(for a 24AC 86VA transfomer, which I have checked at home at 24.85V RMS on my Keysight U1233A and with my Siglent DSO 68V peak-peak (34V max and -34V min)).
=>So big fail for this 6 years UT210e old that I have flashed and contributed for mod it here
https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg1316832/#msg1316832
I have worked on it for about 3 hours, reflashing other 24C02 calibration file, checking many parts etc..
All other functions worked well.
Then I have removed fully the motherboard, and found the issue
==> Wear of the rotary switch !
2 traces have lost their solder mask as you will see on the photos.
I have put a piece af tape, and it is working again, with the good calibration I have made 6 years ago
Now I have to find how I can isolate this traces... will try some UV solder mask
A quick follow up of a problem of one of my 2 UT210E (the one I have given to my brother).
I have to fix his FAAC D600 motherboard (from a motor garage door) which has failed and some burned part on it.
So, after having fixed it at home, I have gone to his home, and when I have rechecked the power voltage line, his UT210E reads 51V DC
(for a 24AC 86VA transfomer, which I have checked at home at 24.85V RMS on my Keysight U1233A and with my Siglent DSO 68V peak-peak (34V max and -34V min)).=>So big fail for this 6 years UT210e old that I have flashed and contributed for mod it here
https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg1316832/#msg1316832 I have worked on it for about 3 hours, reflashing other 24C02 calibration file, checking many parts etc..
All other functions worked well.
Then I have removed fully the motherboard, and found the issue
==> Wear of the rotary switch !
2 traces have lost their solder mask as you will see on the photos.
I have put a piece af tape, and it is working again, with the good calibration I have made 6 years ago
Now I have to find how I can isolate this traces... will try some UV solder mask
8
Beginners / Re: LC filtering for combined Vref/VDD of ADC
« Last post by temperance on Today at 11:12:20 pm »You can power the ADC from a proper shunt reference with a voltage between 3...3.1 V. The digital part of the ADC can tolerate at its input Vcc +0.6V (absolute maximum rating)
As long as the difference between the SPI interface maximum voltage and the shunt ref. minimum voltage stays within 0.3 V, it will work fine and the SPI interface clamping diodes will not conduct.
An LM4040 is a popular shunt reference available in 3 V, 0.1 %, 100ppm. A REF2030 is 0.05 % and 8ppm.
As long as the difference between the SPI interface maximum voltage and the shunt ref. minimum voltage stays within 0.3 V, it will work fine and the SPI interface clamping diodes will not conduct.
An LM4040 is a popular shunt reference available in 3 V, 0.1 %, 100ppm. A REF2030 is 0.05 % and 8ppm.
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Other Equipment & Products / Re: Pace ADS200 soldering station
« Last post by Hydrawerk on Today at 11:08:17 pm »It is probably made of steel and/or aluminium. Pace MBT450 looks a lot more industrial than any today's JBC station. My workmate has a JBC DDE, that is made of plastic. Especially the tiltable LCD does not look very durable.
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General Technical Chat / Re: new propellantless drive company
« Last post by coppercone2 on Today at 11:06:59 pm »That is no reason to investigate an effect. Then its just boring physics instead of popsci physics.
I recall reading that it was significantly above photon drive levels though (according to their experiments), IIRC the whole point was that there is a force that is bigger then the force expected from photons.
The usual problem, that is high power electronics lol. the ones that a experienced engineer sees it as a running lawn mower engine hanging on some springs, being measured with a caliper
I recall reading that it was significantly above photon drive levels though (according to their experiments), IIRC the whole point was that there is a force that is bigger then the force expected from photons.
The usual problem, that is high power electronics lol. the ones that a experienced engineer sees it as a running lawn mower engine hanging on some springs, being measured with a caliper