[time-nuts] Low noise power supply recommendations

Bruce Griffiths bruce.griffiths at xtra.co.nz
Wed Jun 15 06:59:44 UTC 2011

Will Matney wrote:
> As far as the power supply is concerned, I think I am going to go with
> Ni-Cad batteries, and regulate the voltages. I think what they had was
> nothing more than four step voltages from the battery supply, going from 3,
> 6 (7), 12, and 24 Vdc, or X2 of the other. From what I saw in the article
> earlier, an easy zener with emotter follower regulator should do the trick
> by the comparison with batteries. They used some resistance in series with
> the zener to reduce noise, but it did decrease the stability somewhat. I
> have seen this used in some old bias regulation circuits for tubes years
> ago.
A somewhat misguided idea, they really should have used an RC low pass 
filter between the zener and the output transistor base.
The filtering effect is the same but without significantly decreased 
stability over that of an unfiltered zener..
> As far as the noise, I also wondered about this, as ESI used a current
> limited DC power source to do the same thing, and it was ran off the AC
> line.
> Thanks,
> Will
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