The talk back circuit of phones

Published:2011/6/13 21:33:00 Author:Seven | Keyword: talk back | From:SeekIC

The turnratio of the step-up transformer Tis 1:25, which is coordinating with the LM380 gain of 50, then the gain of all the circuit is 1250. The resistor R0 provides with common module sound volume control. LM380 is a sound frequency integrated amplifier, which has the internal gain of 50(34dB), and the output can automatically base on the half of the power supply voltage, the input stage can engage in DC coupling or AC coupling according to the need. The output stage has short circuit current limitation and heat cutting off protection circuit. To application, the internal characters can minimize the number of the external elements.



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