Re: Remote Power Supply Connection

"Iain Churches" <IainNG@[EMAIL PROTECTED]
> wrote in message 
news:yy9Xj.1624$_03.705@[EMAIL PROTECTED]
>
>
> "Trevor Wilson" <trevor@[EMAIL PROTECTED]
> wrote in message 
> news:694fk9F30lh2sU1@[EMAIL PROTECTED]
>>
>> "BretLudwig" <bratzirules@[EMAIL PROTECTED]
> wrote in message 
>> news:7a2f6434985dd93af0ad7ca24683b83c@[EMAIL PROTECTED]
>>> "BretLudwig" <bratzirules@[EMAIL PROTECTED]
> wrote in message
>>> news:6889949c0f7376f69fcc9ea26ef19be9@[EMAIL PROTECTED]
>>>> **** Brussels.
>>>>
>>>> Do it yourself and who will know?
>>>>
>>>> Put simply the use of an outboard power supply chassis is the OPTIMUM
>>> way
>>>> to achieve the BEST possible performance.
>>>
>>> **Nonsense. Whilst an external power supply *may* have some
advantages,
>>> transferring large amounts of DC is a dumb thing to do. Using AC is
far
>>> more
>>> sensible. Capacitors need to be placed close to output devices, not
many
>>> cm away"
>>>
>>> That defeats the purpose of having the PS outboard. You want the AC
OFF
>>> the signal chassis!
>>
>> ******elding is cheap and simple. By all means, keep the power
transformer 
>> off the signal chassis, but rectifying and smoothing, THEN trying to 
>> couple the result to the signal chassis is a recipe for disaster.
>
> Please elaborate. What kind of "disaster" ?

**Google: 'Welder'. Welders operate on DC current. It is for this reason 
that commonly available relays have a maximum working Voltage of 27 VDC. 
Much higher and the arc created can be self-sustaining. Damage can be 
considerable.

> My own 50W amp now five years old, has been running
> several hours per day without any problems.  It meets my
> objective for a very low level of hum and noise.  To build
> the same amplifier in a single chassis with the required
> physical separation between critical components
> would have required a footprint the size of a desktop.
>>
>>>
>>> You want the primary filter caps on the PS chassis and some more on
the
>>> signal chassis, with a choke before them that sees only the ripple for

>>> AC.
>>
>> **Nope. You *only* want to transfer AC between chassis. Not DC. Unless 
>> you are a fool, of course.
>
> The idea, Trevor, is to build an audio chassis in which the
> only AC is the signal.  It is a very good solution if it can be
> implemented in a safe way.

**Trying to use connectors for DC (with appreciable current and Voltage)
is 
dumb design. Much smarter to use AC.

Trevor Wilson