[Heathkit] Regulator for PS-9000 Power Supply

[Mark K3MSB]

I already downloaded the data sheet (which is how I found the test circuit
in the first place).

I'm using R1 and R2 values based on the data sheet.


I'm using a separate power supply for the reference voltage and adjusting it
to 5V.  Am I supposed to be doing this (using a separate supply)?  I basing
this on the statement that the nominal reference voltage is 5V, which tells
me I can use what I want for the reference voltage and adjusting R1 and R2
accordingly.

Thanks

Mark K3MSB

On Wed, Aug 4, 2010 at 8:31 PM, Tom Frobase <tfrobase at gmail.com> wrote:

> From memory, the regulator has an internal 5 volt reference.  Google
> the data sheet.  There is a formula for calculating the resistor
> values ... Tom, N3LLL
>
> On 8/4/10, Mark K3MSB <mark.k3msb at gmail.com> wrote:
> > OK.   I'm frustrated.
> >
> > I got the new regulator in (Thanks John!) and I can not get the test
> circuit
> > to work that's in the spec sheet.
> >
> > It's the regulator with 2 resistors and 2 caps;  this is not rocket
> > science,  but I can't get it to work.
> >
> > Regardless of what values I select for R1 and R2 ,  Vout = Vin (always)
> with
> > Vc = 5.0 Volts.
> >
> > I'm using a 12V regulated supply for Vin.
> >
> > I've tried R2 = R1 = 5K.   I expect Vout to be 10V.
> >              R1 = 5K and R2 = 10K;  I expect Vout to be 7.5V
> >
> > I'm missing something........   nuts.....
> >
> > 73 Mark K3MSB
> >
> >
> >
> > On Fri, Jul 16, 2010 at 2:12 PM, Mark K3MSB <mark.k3msb at gmail.com>
> wrote:
> >
> >> Greetings !
> >>
> >> I'm trying to fix a PS-9000 power supply for the SS-9000 Transceiver,
>  and
> >> I think the regulator is shot.
> >>
> >> The regulator (Heath Part Number 442-685) is the out of production
> >> UA78GKC.   I cross referenced this to ECG1926, but it seems to be out of
> >> production as well,  although it's still available from a few "out or
> >> production" sources;  I have emails out to these places for prices,  but
> >> nothing's come back yet.   I'm wondering if they don't want to deal with
> a
> >> customer that want's only one unit.
> >>
> >> On the off chance....   anybody have a spare in their parts box they'd
> >> care
> >> to sell?
> >>
> >> Thanks
> >>
> >> Mark K3MSB
> >>
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