RE: In car PSUs...

["Ian B" <Ian@xxxxxxx>]

Phil

I have accounts at all the afore mentioned suppliers and their catalogues
so
just pop round and browse/borrow.

You will be ale to buy over the counter using my company details.

Ian

> -----Original Message-----
> From: Phil Harris [mailto:phillip.harris1@xxxxxxx]
> Sent: 08 August 2001 18:37
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] In car PSUs...
>
>
>
> Yeah ... I realised after talking with John that it was just a
stepdown
> regulator rather than an actual power supply capable of running off
4-15v.
>
> I understand that Farnell do this kind of thing though ... does
> anyone have
> a Farnell or RS catalogue that they could take a look in and see?
Also, I
> might need to buy a couple of very tiny Torx drivers and I think RS do
> them - do you know whether they will sell to the general public at
their
> trade counters? (Theres one just down the road at Hedge End.)
>
> Phil
>
> > -----Original Message-----
> > From: Keith Doxey [mailto:ukha@xxxxxxx]
> > Sent: 08 August 2001 10:23
> > To: ukha_d
> > Subject: RE: [ukha_d] In car PSUs...
> >
> >
> > 1. I think they need a better web/database designer for their
online
> > catalogue. The details it gave me were....
> >
> > Order Code: WC76H
> > Output Voltage (V): 4.12
> > Input Voltage (V): Jun-15
> > Output Current (A): 3
> >
> > Exactly how many volts is the 15th of June and does the year
affect the
> > current rating!!
> >
> > 2. No. It is a step down PWM regulator which works by turning the
output
> > full on for a percentage of the time eg 1% = 1mS ON 99mS OFF, 50%
> > = 50mS ON
> > 50mS OFF. Very efficient for driving a motor but no good for
> much else. It
> > gives a short burst of the full battery power. You would need a
> switchmode
> > power supply to regulate the voltage. This has the ability to
output a
> > greater voltage than the input which could vary between  8 and
> > 14V (starting
> > the engine and fully charged battery). A conventional linear
> power supply
> > needs an overhead of about 3 volts to operate properly so to
guarantee a
> > rock steady 12V you would need a minimum of 15V.
> >
> > Keith
> >
>
>
>
>
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