>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 16 May 2005 13:21
>To: PIC List
>Subject: [OT] Longshot - JBL eon Power 10 question
>
>
>Anyone know offhand the power transformer secondary voltage for a "JBL 
>eon Power 10 powered speaker".
>I have a dead one. JBL locally can't or won't tell. Google more than 
>usually reticent.
>Probably around 40-0-40v.

Should be able to get a good guess by working back from the rated power
output and speaker impedance.  Google says it's 60Watts RMS, and I'm
guessing it's an 8 Ohm driver.  P(rms) = V^2/8RL

V = SQR(P * 8RL)  = SQR(60 * 8 * 8) = 62volts.

Add a bit of overhead for losses and supply sag and 40-0-40 or possibly
a little less looks like a reasonable value for the rectified supply
rails, which would point to a secondary voltage of ~28-0-28.

I guess the primary has burnt out?  If so have you checked for a thermal
fuse within the transformer itself?

Mike

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