The instrument amplifier circuit with the transformer as the separator

Published:2011/7/1 21:18:00 Author:Borg | Keyword: instrument amplifier, transformer | From:SeekIC

In the figure is the instrument amplifier circuit with the transformer as the separator, this is a circuit whose working voltage range is wide and the gains setting is easy. The input voltage is AM-modulated by UC3901 and added to the primary stage of the transformer T1, and then the input signal is recovered after it is detected by VD2 at the second stage. The modulating frequency of the circuit is decided by RT and CT, according to the parameter, which is 2MHz. The gain is AG＝1＋R2/1R＝l＋27kΩ／3kΩ＝lO times. UC3901 is designed to be at the working state of the fault amplifier at the second stage of the switch stabilizer, whose working voltage range is ＋4.5～＋40V.



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