[Jukebox-list] Speaker ground

[Ron Rich]

OK--thanks, Ron Rich

Jay Hennigan <jay at west.net> wrote:  Ron Rich wrote:
> Hi Jay,
> I am somewhat confused --nothing new for me--
> In the Seeburg "hideaways" when they did not use a "main speaker" with a field coil; all they did was install a big (25-50w?) resistor with approximately the same resistance as the field coil (5200 ohms if I recall correctly),"B+" to ground, and connect the low z speakers to the "RS" tap (also low z).
> My confusion is in the fact that I can't envision how your circuit duplicates the above

OK, my drawing wasn't for field coil amps. It is a setup I use for 
bench-testing amplifiers at or near rated output while avoiding having 
the neighbors call the cops about the noise. The 8-ohm power resistor 
dummy load simulates the speaker load of the jukebox. Two of them in 
series for 16-ohm systems.

The 100-ohm resistor and speaker in series just allow me to hear the 
amplifier at a reduced volume, but the amp is working at rated power 
into the dummy load.

>--also, don't know why your great drawing gets "messed-up" when I reply--

Your mailer is probably set to HTML and collapses the spaces. Set it to 
plain text (unless you're designing a web page and need HTML).

-- 
Jay Hennigan - CCIE #7880 - Network Administration - jay at west.net
NetLojix Communications, Inc. - http://www.netlojix.com/
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