[Heathkit] Regulator for PS-9000 Power Supply

[Mark K3MSB]

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
>