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2
Power/Renewable Energy/EV's / Re: Output Capacitor Selection for Buck Converter
« Last post by tszaboo on Today at 10:33:59 am »TI has an online calculator called Webench, where you can design your SMPS.
You can create a design on the product page:
https://www.ti.com/product/LM61480
Try it!
You can create a design on the product page:
https://www.ti.com/product/LM61480
Try it!
3
Test Equipment / Re: Hacking the HDO1k/HDO4k Rigol 12 bit scope
« Last post by Cees on Today at 10:30:05 am »Whatsoever, the fan speed reduction definitely is an improvement, but to really silence the scope, my take is that the fans would need to be replaced.
Agreed
I replaced the original Fans Protechnic MGA6012MR-O15 (60x15) with Noctua NF-A6x25 - they fit 1:1 without any problems.
I have also fitted silicone frames under the fans.
The airflow and temperatures are the same, but the noise level is pleasantly quiet now
Is Noctua NF-A6x25 the real part number as I see only the three and four wires versions
4
Test Equipment / Re: frequency displayed in Hz
« Last post by Aldo22 on Today at 10:23:24 am »Please tell me . How can I set the frequency to always be displayed in Hz (even if it is 10000Hz or 1,000,000Hz)?
Do I need to change the firmware for this?
This is not possible with normal settings, afaik.
Maybe DavidAlfa can tell you something about the firmware question.
Today I discovered something new that I didn't know.
Is it possible to generate a single 20ns pulse with the AWG of the Hantek?
Yes it's possible and it looks very OK.
5
Beginners / Re: Convert US standard 115V to International 230V
« Last post by radiolistener on Today at 10:21:09 am »Once again, did you read the thread? It was figured out already that the device is using switching power supplies which support both AC voltage and frequency variants on the input.
yes, I read, the topic starter mentioned that his equipment consume 20 A from 115V mains, this is about 2300 Watt power.
He also mentioned example of 2 PSU which is used in his system: Meanwell HRP-150-24 and HRP-600-36. This is 150W and 600W SMPS power supplies which already have universal AC input with 47 - 63 Hz frequency range.
These PSU can be used directly. But this is just 750W power consumption.
But what about power supply for the rest 1550 Watt power consumption?
Are you sure that they also compatible with both frequency standard?
There is also another possible issue which is critical for medical devices, even if he using PSU which all are compatible with all mains standards, it still needs to be tested with both mains frequency. Note that the mains frequency has leakage through PSU in a form of a ripple and/or interferences and can affect equipment functions, especially if this is device which uses sensitive measurements.
For example precise ADC can have configurable rejection filter which can be software configured for 50 or 60 Hz depends on user environment. And it needs to be taken into account very carefully especially for medical devices (which is the case for topic starter question).
6
General Technical Chat / Re: Is VAT number needed when ordering from Arrow USA?
« Last post by jc101 on Today at 10:18:39 am »At the moment you don’t need to be registered if your turnover is below £85,000 a year. Above that it’s mandatory. I export quite a lot of what I make, with exports zero rated I can claim the VAT back on the parts so often get a refund from HMRC.
7
Repair / Soshine S5 charger
« Last post by Gagili on Today at 10:17:33 am »Dear, in my first post I want to greet you.
Don't mind the English, I use what I know and google translator for help.
I hope I didn't post the topic in the wrong part of the forum.
The problem I have is with the Soshina S5 charger. Instead of the ordered Soshine S5 LiFePO4, I received a Soshine S5 Li ion.
There would be too many complications about returning, sending another one, etc.
My question is if anyone has a schematic for the Soshine S5 li ion, or a way how or what elements to change to make it adequate for LiFePO4 batteries.
I have posted a picture of the received charger in attacments.
Thank you for your attention and help.
Don't mind the English, I use what I know and google translator for help.
I hope I didn't post the topic in the wrong part of the forum.
The problem I have is with the Soshina S5 charger. Instead of the ordered Soshine S5 LiFePO4, I received a Soshine S5 Li ion.
There would be too many complications about returning, sending another one, etc.
My question is if anyone has a schematic for the Soshine S5 li ion, or a way how or what elements to change to make it adequate for LiFePO4 batteries.
I have posted a picture of the received charger in attacments.
Thank you for your attention and help.
8
EEVblog Specific / Re: EEVblog #1181 - Car ECO OBD2 Fuel Saver SCAM
« Last post by langwadt on Today at 10:10:56 am »QuoteThat doesn't sound logical. Wouldn't better fuel economy automatically cause less emissions? Less fuel burned, less exhaust gas produced and all?
That's not only about CO2, after tuning NOx and PM emissions can be raised even when it is fuel economy tuning.
and unlike CO2, NOx and PM has an immediate local effect
9
Beginners / Re: Convert US standard 115V to International 230V
« Last post by Zero999 on Today at 10:10:49 am »Radiolistener, can you delete your posts?Unfortunately, that would mean him admitting he's mistaken and going by his posting history, is something he appears to be unable to do.
10
Microcontrollers / Re: How to identify MCU by it's pinout?
« Last post by coromonadalix on Today at 10:10:37 am »seems enhanced 8051 family ... and i think STC does it too ??