Opinion on Semi predictive feedback control

Started by Klaus Kragelund in sci.electronics.design1 hour ago

Hi I got a power supply working in hysteresis mode with a not very precise reference So I am wrapping a digital loop with a microcontroller...

Hi I got a power supply working in hysteresis mode with a not very precise reference So I am wrapping a digital loop with a microcontroller around it using a DAC output to tune the reference and thus the output to a precise value Right now I have it working with a very simple P regulator, so if the value measured by the ADC is off target, I just move the DAC control one LSB


Rotational Field From Two Signals - Confirm

Started by Steve Morris in sci.electronics.design1 hour ago 50 replies

I want to create a rotational field from two signals. Can someone please confirm if this is the correct approach? Are the coils correctly...

I want to create a rotational field from two signals. Can someone please confirm if this is the correct approach? Are the coils correctly wired? See linked diagram below. https://app.box.com/s/zdlcd624qb3ortyxowk4bnhe4zgs4y8v Steve Morris


OT Superfluid dark matter

Started by George Herold in sci.electronics.design2 hours ago 13 replies

Sorry, for the OT, but it's gotta be better than immigration politics. This link will break when a new post comes, then search archives for...

Sorry, for the OT, but it's gotta be better than immigration politics. This link will break when a new post comes, then search archives for superfluid dark matter, Jan. 10 2018 http://backreaction.blogspot.com/ I'm slowly reading the paper. https://arxiv.org/pdf/1711.05748.pdf I have no idea about 'binary Tulley-Fisher relations', but I'm blowing past that and reading on.. :^) Ge...


Two new FOSS EDA packages

Started by Neon John in sci.electronics.design3 hours ago 3 replies

I just discovered two new open source EDA packages https://github.com/carrotIndustries/horizon This one has a stable version. It is being...

I just discovered two new open source EDA packages https://github.com/carrotIndustries/horizon This one has a stable version. It is being developed by a Swiss corporation so advances should be made quickly. It uses the KiCAD router. They are communicating with the KiCAD development team. Lots of support on the KiCAD dev list for working together. The other one is LibrePCB. h...


OT: Sweden Preps for Civil War

Started by Cursitor Doom in sci.electronics.design3 hours ago 43 replies

Getting pretty rough out there in the showpiece Socialist state of Sweden: https://tinyurl.com/y9koqzoe -- This message may be...

Getting pretty rough out there in the showpiece Socialist state of Sweden: https://tinyurl.com/y9koqzoe -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this manner via non-Usene...


Replacement of UPS battery

Started by Andy in sci.electronics.design4 hours ago 3 replies

I am learning a lot here. What are your thoughts on this. I understand that an inverter converts dc to ac. What does the last sentence...

I am learning a lot here. What are your thoughts on this. I understand that an inverter converts dc to ac. What does the last sentence mean as far as rating of the inverter?


uP1540P VRM datasheet ?

Started by Brane2 in sci.electronics.design5 hours ago

It's small ( 14-pin?) chip that looks like it's at the heart of small RAM VRM on an AM1 motherboard. I need more data about it, but so far I...

It's small ( 14-pin?) chip that looks like it's at the heart of small RAM VRM on an AM1 motherboard. I need more data about it, but so far I couldn't dig out anything...


SO8 versus SOT89 junction to ambient?

Started by Joerg in sci.electronics.design7 hours ago 9 replies

Attention, highly non-political post. Here is a puzzler. This ST datasheet says on page 5 that the junction to ambient temp rise is 55C/W for...

Attention, highly non-political post. Here is a puzzler. This ST datasheet says on page 5 that the junction to ambient temp rise is 55C/W for SO8 and 115C/W for SOT89: https://media.digikey.com/pdf/Data%20Sheets/ST%20Microelectronics%20PDFS/L79L.pdf This TI datasheet for the positive regulator states pretty much the opposite on page 4: http://www.ti.com/lit/ds/symlink/ua78l.pdf ...


UPS output voltage

Started by Andy in sci.electronics.design7 hours ago 38 replies

I use a UPS for my computer. Using a RMS voltmeter, I measured the voltage at 91 V when only the UPS is supplying power. Should it be closer...

I use a UPS for my computer. Using a RMS voltmeter, I measured the voltage at 91 V when only the UPS is supplying power. Should it be closer to 120 V? It measures 116V when powered.


Highly Unusual Bomb Cyclone to Hit Entire Atlantic Coast of U.S.

Started by Anonymous in sci.electronics.design7 hours ago 89 replies

Record cold and unheard of weather in many places, hurricane force winds and copious amounts of snow, rain and ice. This will not turn out well,...

Record cold and unheard of weather in many places, hurricane force winds and copious amounts of snow, rain and ice. This will not turn out well, it is wise to prepare for extended outages. http://mashable.com/2018/01/02/weather-bomb-to-strike-east-coast-arctic-blast-coldest-to-date/#k irxoB42Taq6


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