nuckollsr(at)cox.net
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 Posted: Sat Apr 08, 2006 4:50 am Post subject: Headphones "auto-loading" circuit |
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| Quote: |
Comments/Questions: I'm installing a PS1000II intercom in a 172M, picking
up the phone hi line at the ship's auxiliary phone jack. This jack grounds
the hi side through a 560 ohm resistor if a phone is not plugged in.
What's the purpose of this resistor, and do I need to keep this peculiar
jack for the pilot's phone jack?
Thanks.
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I can only guess. The the designer of the system probably
believes its a bad thing to leave the output of the
amplifier unloaded. He may have some experience that suggests
constant loading is a good thing . . . or he may have heard
a rumor about it and decided that the CYA approach to design
was more comfortable.
I suspect that the auto-loading feature is not necessary.
Bob . . .
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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