[Heathkit] Regulator for PS-9000 Power Supply

[Tom Frobase]

>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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