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tanvir
Apprentece

Bangladesh
7 Posts
Posted - Sep 10 2005 :  03:04:22 AM  Show Profile  Reply with Quote
i want make a pair of integrated micrphone & speaker device such that i can talk to somebody from the 2nd floor withot opening the door.

audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - Sep 10 2005 :  09:10:18 AM  Show Profile  Reply with Quote
You will have long distance acoustical feedback howling unless you add some out-of-phase signal to the speaker amp at each end.
Red circuits have a good project that will work fine: http://www.redcircuits.com/Page78.htm




Edited by - audioguru on Sep 10 2005 09:12:18 AM
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