450 audio signal generator circuit

Published:2011/8/6 8:27:00 Author:nelly | Keyword: audio signal, generator | From:SeekIC

This oscillator is the signal source of the communication unit users. The working principle is as shown in the picture. It is composed of the VT1, VT2 and the related components. VTl uses the transformer T coupling to generate the oscillator signal, and the VT2 is the buffer amplifier of common collector circuit. T changer 1—4 winding form the frequency selective network. In order to prevent the magnetic saturation, T is connected to the collector of VT| by 1-2 tap, 5-6 of T is the feedback coil. Test: The pin of the every DC potential (reference value) is as shown in the table.



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