[sdiy] L7915 - Confusion

[Paul Perry]

I don't think that cascading regulators will necessarily increase noise in 
the last regulator.
After all, there is likely much less noise after the first regulator, than 
before it. (except for noise spikes etc from circuits it is powering.)
But, if you are doing this, you have to consider the TOTAL current going 
through regulators earlier in line.
I have put regulators in series, and I would do it again, in some 
circumstances, depending.

paul perry Melbourne Australia

----- Original Message ----- 
From: "David Schwan"

> Cascading the regulators will cascade any noise contribution from each
> regulator. If you are concerned about noise run each regulator from
> the original unregulated source.
>
>
> Sent from my iPhone
>
> On Jan 21, 2011, at 3:47 PM, <lanterma at ece.gatech.edu> wrote:
>
>>
>> On Jan 21, 2011, at 5:30 PM, Matthew Smith wrote:
>>
>>> Just for the record, this is a little +15/-15V 0.6A bench supply
>>> I'm putting together with ammeters on both rails for development
>>> and debugging purposes.
>>
>> Speaking of which... I'm working on something similar...
>>
>> If one wants multiple voltages - say 5V, 9V, 12V, and 15V, in some
>> combination - is it better to "cascade" voltage regulators? (I.e.
>> get 12 V from 15, 9 V from 12 V, 12 V, 5 V from 9, etc.), or
>> "parallel" them (have all the regulators get their inputs from the
>> same original >15V supply)?
>>
>> - Aaron
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