26 Apr 2003, 02:03, Charles Angelich (1:106/2000), wrote to Matt Mc_carthy:

Hi Charles.

 CA> With my somewhat basic understanding of DC current I was
 CA> surprised at what happened myself but I did double check the
 CA> 12vdc wall wart and it does say 'vdc' on it. 

 CA> Would unrectified _pulsating_ DC do damage to the speaker 
 CA> amplifier?

"Unrectified" doesn't fit the situation, as that's a necessary
element to be able to plug it into the wall and call the output
"DC". 

"Unregulated", which is common to many wall-warts, would mean the
output voltage with no load might be as high as 18 Volts for a 12 Volt unit
with no load or a very light load.

"Unfiltered", also common to many wall-warts, means that there
will be some pulses called 'ripple', but certainly no negative spikes that
would kill an amp.

Of course, all of the above assumes that the wall-wart is functioning correctly...


     Good luck...  M.

--- Msged/386 TE 06 (pre)