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Old 15th May 2005, 07:42 PM   #1
csl113 is offline csl113  Romania
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Default impedance detector->help

i need to build a impedance detector....

this waht i what to build more exactly:

i neet to make the amplifier to"know" if the loudspeakers at the exit are 2,4,or 8 ohm... and in each case to activate a diffrent relay...

this is what i was thinking:

a comparator that compares the voltages at the output, and the amp's but i don't know how i can make that...(i don't know to biuld the schematic)

and also i don't know if it will work,because of the phase shift .....

does anyeone have any ideea how can i do that(not with pic's) or any link's or schematics...???

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Old 20th May 2005, 01:27 PM   #2
soongsc is offline soongsc  Taiwan
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The speaker load is not constant throughout the audio range, it could vary to twice or three times the nominal value.
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Old 1st June 2005, 11:38 AM   #3
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I think JL audio car amps (at least the non e-class entry) do that and have a regulated supply. I believe they internally switch supply rails.
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