Motorola used to make some; we used these for some accelerometer
supplies --1n5314 ; but they were getting difficult and $$ a while back; I'm
not sure if On-Semi picked those up or not.  We switched to Vishay-Siliconix
CR160 series.  --Although I don't see anything that goes up to 20ma though
(4.7ma).  Anyway, might be worth pursuing this line of thought...

I'd be interested to see if this kind of thing worked or not.  Keep us
posted.
-Dal
----- Original Message -----
From: Douglas Butler <dbutler@IMETRIX.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, August 16, 2001 12:06 PM
Subject: Re: [EE]: tiny power supply


> The resistor zener supply is pretty robust and foolproof.  You can make
> it tougher by using a current limiting (or current regulating) diode
> instead of the resistor.  I don't know who makes them but a few years
> ago we used them for a bootstrapping supply.  They look like a diode but
> function as a current source of about 5 to 20 mA.  You can also use a
> JFET with the gate shorted to the source.
>
> Sherpa Doug
>
> > -----Original Message-----
> > From: Lyle Killough [mailto:lyle@SUREGRIPCONTROLS.COM]
> > Sent: Thursday, August 16, 2001 1:06 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [EE]: tiny power supply
> >
> >
> > I have a power supply problem which I am hoping to get some
> > good suggestions
> > on..... (I have lots of my own bad ideas)
> >
> > I am designing a small PIC-based device for use in mobile hydraulic
> > machinery.  There is VERY little room on the board - the
> > board will be less than .85x.75 inches / 22x19 mm, and there
> > will be a 3A

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