Re: 5V PSU's ?



Palindrome wrote:

Just pick any of the Hong Kong Ebay electronic bits sellers and ask for a quote for the number and the spec that you want. I did that for a load of USB power "wall warts", rated at 5v 1A (the type with a built-in USB socket). They came in at under 1GBP each, IIRC.

Can't see em being too interested when I say 1, maybe 2 ;-)
50,000 ... maybe :-)

Common sense tells me that a n-port USB will want/expect a n/2 + a bit - rated PSU (assuming USB spec of 500mA power/port) so a 4-port hub would want 2-and-a-bit amps. Does this sound reasonable ?

They had quite an interesting SMPSU design - which I found out when I opened a DOA one. As that one had a resistor that had been clearly broken during the case assembly, they clearly don't test them following prior to shipping.

Don'cha just love those chinese eh ?

.



Relevant Pages

  • Re: 32kHz crystal issues
    ... The load capacitance is what the spec says it should be, ... I'm mostly wanting to make sure the design will work on the PCB. ...
    (sci.electronics.design)
  • Re: Thermal shutdown too early?
    ... electronic equipment or device that will run at that temperature. ... See the Pentium M specification at: ... That is an ambient temperature spec, ... Page 36 lists the operating range for the socket, ...
    (microsoft.public.windowsxp.help_and_support)
  • Re: Best method for dropping supply voltage a volt or two for low power device?
    ... range of 8 to 12V powered by a car batteryto bring it within spec? ... 14V source and 3mA load ... criteria for the resistor selection. ... So, basically, the circuit fails when the source voltage falls below: ...
    (sci.electronics.design)
  • Re: Best method for dropping supply voltage a volt or two for low power device?
    ... 14V source and 3mA load ... criteria for the resistor selection. ... its current then will rise to 14.9mA, which is within spec. ... since there's 100 µA in the load, the reference will be carrying: ...
    (sci.electronics.design)
  • Re: Tech Display on System 11
    ... are out of spec, then the 100V will go low with a load on it (but ... often reads fine when no load is attached). ... connected to the master display unit, ... supply board, or perhaps one of the chips on the master display board? ...
    (rec.games.pinball)