Diode on light load keeps failing

Started by Pimpom in sci.electronics.design4 days ago 36 replies

This question arises from a repair work I'm doing on a friend's plasma TV - a Panasonic TH-P42X30T. The rectifier for the 5V standby supply...

This question arises from a repair work I'm doing on a friend's plasma TV - a Panasonic TH-P42X30T. The rectifier for the 5V standby supply failed short. The rectifier is a B3100, a schottky diode rated at 3A & 100V. The service manual I downloaded omits a detailed schematic of the power supply board but at least the load currents of the various voltages are printed on the board. The ...


Boost Car Remote With Skull

Started by Anonymous in sci.electronics.design5 days ago

https://www.youtube.com/watch?v=5onLn6Yd-eQ

https://www.youtube.com/watch?v=5onLn6Yd-eQ


More on Strange Contra-wound Toroids

Started by Robert Miller in sci.electronics.design5 days ago 9 replies

Electromagnetic Radiation Experiments with Transmitting, Contra-Wound Toroidal...

Electromagnetic Radiation Experiments with Transmitting, Contra-Wound Toroidal Coils. http://www.sciencedirect.com/science/article/pii/S1875389211005773 "However, the most difficult results to explain away are probably those for the current-opposing modes of operation, where counter-flowing alternating currents in contra-wound toroidal coils resulted in no magnetic field whatsoever in...


type K thermocouple

Started by John Larkin in sci.electronics.design6 days ago 8 replies

I'm going to cook a Beef Wellington, filet en croute, for Christmas. We have some great friends who are just awful cooks, so we'll prep the meal...

I'm going to cook a Beef Wellington, filet en croute, for Christmas. We have some great friends who are just awful cooks, so we'll prep the meal and take it to their place and finish it off in the oven. BW is tricky to get just right, and regular meat thermometers are not very good, so I got this: https://www.amazon.com/gp/product/B008S0K66C/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 I'...


Replace the cord on all radios, tvs and other electronics every five years.

Started by Anonymous in sci.electronics.design6 days ago 44 replies

The cords used on radios, televisions, and other electronics are 18ga or 16ga copper wire encased in plastic. It's a little known fact...

The cords used on radios, televisions, and other electronics are 18ga or 16ga copper wire encased in plastic. It's a little known fact that every year those cords lose 10% of their electrons. By the 7th or 8th year, these cords are incapable of providing enough power to the electronic devices, which causes the electronics to fail. After ten years, these cords can hardly transfer any electric ...


OT: Bluetooth Connection Troubles

Started by rickman in sci.electronics.design6 days ago

I have never been able to use Bluetooth effectively with a PC. I don't know if the drivers are crap or if no one else uses it so they've never...

I have never been able to use Bluetooth effectively with a PC. I don't know if the drivers are crap or if no one else uses it so they've never bothered to make it work properly. Many years ago I had a Bluetooth GPS which would not stay connected to a Palm Pilot two feet away. I had oh, so many troubles trying to even get it connected to a PC. Over the years I have tried Bluetooth wit...


PC Down : Boot Configuration Data Corrupt or Missing

Started by Anonymous in sci.electronics.design6 days ago 26 replies

My main PC didn't boot up the other day. Blue screen of death with the above message. Tells me to boot from installation media and use recovery...

My main PC didn't boot up the other day. Blue screen of death with the above message. Tells me to boot from installation media and use recovery tools. I can't get the PC to boot from the USB stick I created for this. The PC came with installation files on a second partition, but I can't find a way to boot from that either. Shop in town wants two days and $100 to jack up my d


Nice error

Started by Tim Williams in sci.electronics.design6 days ago 1 reply

[Error] breakpoint in the past - HELP! 10:51:59 AM 12/9/2017 [Error] doAnalyses: Impossible error - can't occur 10:51:59 AM 12/9/2017 I'm...

[Error] breakpoint in the past - HELP! 10:51:59 AM 12/9/2017 [Error] doAnalyses: Impossible error - can't occur 10:51:59 AM 12/9/2017 I'm just posting this more out of amusement, and that there's apparently nine hits on the entire internet for the search: "breakpoint in the past" "help" The top hit being an NGSpice mailing list. If anyone's seeing this message, in turn... ¯\_(?)_/¯


small low-capacitance Schottky diodes

Started by Winfield Hill in sci.electronics.design6 days ago 26 replies

Some here may remember my big RIS-767 project, the "highly-efficient low-voltage boost-converter testbed", with free testbed PCBs offered up...

Some here may remember my big RIS-767 project, the "highly-efficient low-voltage boost-converter testbed", with free testbed PCBs offered up for experimenting. I claimed we could create 98% efficient converters. The RIS-767 testbed allows creating custom converter circuits, as well as using the same platform to test the best commercial boost-converter ICs we could find. Rob Legg h...


Flashlights

Started by Tim Williams in sci.electronics.design6 days ago 14 replies

These are fun! https://www.seventransistorlabs.com/Images/FlashlightTrio.jpg Triple 'LVC buffer drives the power transistor at 5 or 6...

These are fun! https://www.seventransistorlabs.com/Images/FlashlightTrio.jpg Triple 'LVC buffer drives the power transistor at 5 or 6 nanoseconds risetime, not bad at all. Design is very hackable; by changing around a couple of resistors, it makes a portable bench supply! Tim -- Seven Transistor Labs, LLC Electrical Engineering Consultation and Contract Design Website: https:/...


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