[volt-nuts] Power Designs Precision Power Supplies
Andreas_-_Jahn at t-online.de
Wed Apr 25 22:04:08 UTC 2012
At least the 2N-Types can be found:
For the rest: did you really read the type number or something like the
With best regards
> I looked up the transistors in the 2020B and 5020 and half of them are
> unobtanium. By chance, does anyone have the specs of these? I've tried
> the web based resources and located 2 transistor specs, and were barely
> Does anyone know what these voltage references where?
> Voltage References
> At 03:40 PM 4/23/2012, Dave M wrote:
>>I used to repair and calibrate lots of Power Designs supplies back in the
>>late 60s and early 70s. They were always top-notch supplies, very low
>>noise & ripple, and seldom failed.
>>For instance, the ripple/noise spec for the model 5015 was < 250uV RMS.
>>amd stability was 0.01% +5mV per 8 hours.
>>The model 2020 precision supply ripple/noise was 100uV P-P, and stability
>>was 0.001% + 100uV per 8 hours. Very nice supplies.
>>I have several of the PDI supplies in my shop, and use them often. They
>>are excellent supplies. I love the constant current mode on them; that
>>feature has saved more than one project from going up in flames.
>>I have a model C500 (0-100V/0.5V precision supply) that needs repair. The
>>reference assy is bad; haven't had time to get into it.
>>If you need manuals, I have PDF copies of a few models, (mainly models
>>that I have in my shop). Post your interests and if I have the manual,
>>I'll send it to you.
>>A woman has the last word in any argument. Anything a man says after that
>>is the beginning of a newargument.
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> Marv Gozum
> Philadelphia, PA
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