[time-nuts] power supplies

[Gerhard Hoffmann]

I love my R&S NGT20, I have several of them.
Reasonably clean, analog, uA741 technology, no switcher, knobs for 
everything.
3 independent, unconnected outputs:

2* 0-20V at 1A for op amps etc

1*0-6V at 5A for the digital stuff

for example:
< 
https://www.ebay.de/itm/Rohde-Schwarz-DC-Power-Supply-Stromversorgungsgerat-Typ-NGT-20/193258127587?hash=item2cff1500e3:g:v6wAAOSwlnVd9j7J 
   >


I have measured some of the devices I have here to see how much there

was to filter for my analog toys:


< 
http://www.hoffmann-hochfrequenz.de/downloads/Noise_Measurements_On_Some_Laboratory_Power_Supplies.pdf 
    >

For the NGT20 that was not much.

The HP6633B: OMG!!!

Cheers, Gerhard




Am 01.05.20 um 20:51 schrieb jimlux:
> What with telework, I'm doing more timenuts-ey stuff at home, and the 
> power supply conundrum has come up.
>
> There's a plethora of interesting widgets scattered across my bench 
> requiring variously, 5V, 8V, 12V, and 15V.
>
> I've got a box full of various fixed voltage supplies, mostly linear, 
> picked up over the years.
> I suppose I can package a bunch of those up in a bigger box with 
> banana jacks or binding posts.
>
>
> And then there's some things where you'd like current limiting and/or 
> variable voltage.
>
> So I've started looking at inexpensive bench power supplies - there 
> appear to be dozens, if not hundreds, of these available. There must 
> be dozens that are all very similar - They're switchers for the most 
> part, displays, etc. for $50-100, from different vendors, all similar.
>
> Are they essentially commodity? Or are there particular brands that 
> are good or bad?
>
> Are they all noisy?
>
> Weird UI problems (7 menu layers with a single knob)?
>