Power factor for rectifier/capacitor input

Started by bob prohaska in sci.electronics.basics2 months ago 7 replies

Power supplies that take AC line power, rectify it to DC and then use a DC-DC converter to generate whatever output is desired seem fairly...

Power supplies that take AC line power, rectify it to DC and then use a DC-DC converter to generate whatever output is desired seem fairly common. Those that I've dissected don't seem to have any inductors between the caps and the AC line. What's the power factor in such a setup? It's clearly not zero, because some power gets to the load, but all the AC line sees is a pure reactance, unles...


Pop up displays | Pop up Stand | | Dot2Dot

Started by Anonymous in sci.electronics.basics2 months ago

A pop up system is normally a little window that suddenly shows up in the forefront of the visual interface. Pop up system are a stylish...

A pop up system is normally a little window that suddenly shows up in the forefront of the visual interface. Pop up system are a stylish exhibition solution for anyone looking for an eye-catching curved back walls .High quality pop ups stands to create an impact at any type of events. It is incredible for exhibition, showrooms, and occasions, gathering zones, award ceremonies and pr


Honda Battery Charging

Started by Jim Thompson in sci.electronics.basics2 months ago

Looks like Honda finally started 'charging' their batteries... {> :-} ...Jim...

Looks like Honda finally started 'charging' their batteries... {> :-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-S


Electrify the fence; problem solved?

Started by Anonymous in sci.electronics.basics2 months ago 3 replies

http://www.msn.com/en-us/news/world/woman-dies-after-jet-engine-air-blast/ar-BBEkmRB

http://www.msn.com/en-us/news/world/woman-dies-after-jet-engine-air-blast/ar-BBEkmRB


Digital printing in Malaysia | Pop up Stand | | Dot2Dot

Started by Anonymous in sci.electronics.basics2 months ago

Are you looking for a pop up display to boost the look of your trade show booth .Pop up Displays also have the convenience of being portable,...

Are you looking for a pop up display to boost the look of your trade show booth .Pop up Displays also have the convenience of being portable, simple to store and an easy display stand system to line up. Pop up displays include gorgeous graphics and case-to-counter choices. Most Pop Up Displays can be set up by one person during a matter of minutes. Taking a Pop Up stand down after


MOSFET: N- or P-, enhance or deplete?

Started by Bob Engelhardt in sci.electronics.basics3 months ago 35 replies

Here's really basic question for s.e.BASICS: I want to use a MOSFET to control a load, via a switch. The tricky part is that I need load...

Here's really basic question for s.e.BASICS: I want to use a MOSFET to control a load, via a switch. The tricky part is that I need load current when the switch is open and no current when the switch is closed. What I am confused about is what type of MOSFET to use, and its orientation in the circuit (S & D connected which way?) + | ...


OT: Test, Ignore

Started by billbowden in sci.electronics.basics3 months ago

Test

Test


ground wire

Started by kurtstocklmeir in sci.electronics.basics3 months ago 45 replies

I have a big mess. A person took off my carburetor on my car and I can not find the person. The carburetor was put back on my car but there is...

I have a big mess. A person took off my carburetor on my car and I can not find the person. The carburetor was put back on my car but there is 1 wire from the fuel cut off solenoid that is not connected to the car. The solenoid is part of the carburetor. I can not find any person who knows where the wire goes. I think - the wire is black - it connects to ground or negative. If I can not find...


[BBC] Jean-Claude Juncker: I don't own a smartphone

Started by Mr. Man-wai Chang in sci.electronics.basics3 months ago

Jean-Claude Juncker, the president of the European Commission, has admitted that he does not own a smartphone. Full story: "I shouldn't...

Jean-Claude Juncker, the president of the European Commission, has admitted that he does not own a smartphone. Full story: "I shouldn't say, but I have to say it - I still don't have a smartphone," the 62-year-old told a news conference. The light-hearted confession came as he helped launch the EU presidency of digital-savvy Estonia.


Ripple Current and ESR

Started by Chris in sci.electronics.basics3 months ago 50 replies

Hi all, What's the deal with this? I read somewhere that a high ripple current figure for an electrolytic is a bonus; an expensive and...

Hi all, What's the deal with this? I read somewhere that a high ripple current figure for an electrolytic is a bonus; an expensive and sought-after characteristic. However, I'd always thought ripple was anathema to PSUs. Can some expert kindly explain the relationship between ESR, ripple current, capacitor ageing and whatnot? thanks.


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