LT spice, leakage inductance

Started by John Larkin in sci.electronics.design6 hours ago 38 replies

I'm simulating a flyback switcher and noticed that any K < 1 in the transformer radically slows down the sim, which is annoyingly...

I'm simulating a flyback switcher and noticed that any K < 1 in the transformer radically slows down the sim, which is annoyingly slow already... 90 seconds to sim 60 ms of startup and a little pulsed load blip. Maybe 6:1 slower with a little leakage inductance. So I only include leakage inductance to tweak the snubber. -- John Larkin Highland Technology, Inc picosecond


Separating high pass and low pass TIA output bands.

Started by Artist in sci.electronics.design8 hours ago 20 replies

I have an assignment to design a transimpedance amplifier for a photodiode. The bandwidth is to be 40MHz, and there are to be two outputs, a...

I have an assignment to design a transimpedance amplifier for a photodiode. The bandwidth is to be 40MHz, and there are to be two outputs, a high pass output above 20kHz and a low pass output below 20kHz all the way to DC. It is permissible that the two bands overlap a little bit. The noise performance of an amplifier is primarily determined by the noise in the first stage where it is...


Towards the *fully* 3D-printed electric cars.

Started by Robert Clark in sci.electronics.design8 hours ago 378 replies

An article from 2015: 3-D-printed car could hit streets next year. Chris Woodyard, USA TODAY 4:48 p.m. EST November 12,...

An article from 2015: 3-D-printed car could hit streets next year. Chris Woodyard, USA TODAY 4:48 p.m. EST November 12, 2015 http://www.usatoday.com/story/money/cars/2015/11/10/3d-printed-car-local-motors-swim/75530830/ Several companies have come out with what they call "3D-printed" cars, but none have 3D-printed the most important part, the engine. This would be difficult to do wit...


Should Math be taught in schools? Lets ask the "Miss USA pageant contestants"

Started by Anonymous in sci.electronics.design9 hours ago 44 replies

Getting back to the certifiable morons, except Miss Vermont, a real standout: https://www.youtube.com/watch?v=vUNM377g-M4

Getting back to the certifiable morons, except Miss Vermont, a real standout: https://www.youtube.com/watch?v=vUNM377g-M4


Test Isolated Ground Rod with Multimeter and Battery

Started by Robert Miller in sci.electronics.design9 hours ago 6 replies

I have a copper ground rod at a remote location, driven 2 meters into the soil. At this stage, it is on its own and not connected to any power...

I have a copper ground rod at a remote location, driven 2 meters into the soil. At this stage, it is on its own and not connected to any power system. Before proceeding with my installation, I would like to evaluate how well the rod conducts to earth. Can a use a 12V SLA battery and multimeter to do this accurately? If so, please advise how. Robert Miller


SF Millenium Tower Again

Started by Anonymous in sci.electronics.design10 hours ago 5 replies

Wonder how they plan on leveling the existing fiasco that leans so much the elevators jam? Looks like the original design group didn't get...

Wonder how they plan on leveling the existing fiasco that leans so much the elevators jam? Looks like the original design group didn't get bogged down in too much math. https://www.bizjournals.com/sanfrancisco/news/2017/07/19/fix-may-be-in-the-works-for-millennium- tower.html


Residential Solar Relieving Peak Demand

Started by rickman in sci.electronics.design12 hours ago 35 replies

My understanding is the peak usage period each day in the summer is about 3 to 6 PM. A few days ago the forecast was for 95F+ for a couple of...

My understanding is the peak usage period each day in the summer is about 3 to 6 PM. A few days ago the forecast was for 95F+ for a couple of days. The local electrical utility cooperative sent an email asking members to reduce power consumption between 3 and 6. I complied by cutting off my AC during that period. Before I cut it off I lowered the thermostat a couple degrees so the hou...


Automotive electronics - Honda charging system

Started by Peabody in sci.electronics.design13 hours ago 72 replies

This may not be the appropriate place to post about this. If so, just ignore it, and my apologies. Honda has a dual-mode charging system for...

This may not be the appropriate place to post about this. If so, just ignore it, and my apologies. Honda has a dual-mode charging system for US models. When the headlights are on, or any other combination of things that increases the amp draw through the system to a certain point, the computer tells the alernator to put out 14.4V, or thereabouts. But at all other times the alternator...


55v ceramic caps

Started by John Larkin in sci.electronics.design17 hours ago 25 replies

I need to run some 1206 ceramic caps at 55 volts or so, as bypasses, and I have a 4.7U 50V part in stock. Capacitance drops to 0.42 uF at 50...

I need to run some 1206 ceramic caps at 55 volts or so, as bypasses, and I have a 4.7U 50V part in stock. Capacitance drops to 0.42 uF at 50 volts, where leakage is about 100 nA. At 200 volts, it's 250 nA, and at 300 it's 1.5 uA. I have a couple soaking at 300 volts. Looks OK to me. -- John Larkin Highland Technology, Inc picosecond timing precision measurement jla...


Plan B : Blocking out the sun to fight global warming

Started by Anonymous in sci.electronics.design17 hours ago 12 replies

When this goes into effect on a global scale, be very...

When this goes into effect on a global scale, be very worried: http://www.cbc.ca/news/technology/bob-macdonald-blocking-sun-global-warming-1.4050149


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