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VARYING_FREQUENCY_OSCILLATOR

2016-08-31 12:01  
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VARYING_FREQUENCY_OSCILLATOR
Output frequency of alarm tone generator changes continuously. With suitable ampliler and loudspeaker, can easily be heard in noisy environments where single tone or amplitudemodulated tone would go unnoticed.-A. Jnall, Varying-Frequency Warning Alarm, EEE, l2:7, p 25.