Popular Electronics April 1966
![Popular Electronics, April 1966, Ultrasonic Omni-Alarm](PE_Apr_1966_CoverA.jpg)
Copyright © 1966 Poptronix, Inc.; used by permission.
Ultrasonic Omni-Alarm
By Daniel Meyer
Out of Tune on Reverb
Switch from cps to Hertz
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![Popular Electronics April 1966 Page 82](PE_Apr_1966_pg82t.jpg)
Popular Electronics
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This page was last edited
March 31, 2015