Variable gain amplifier circuit
Source: InternetPublisher:笑流年 Keywords: Variable gain amplifier amplifier circuit WIDTH Updated: 2021/02/04
This circuit uses one quarter of an LM3900 circuit to form a simple variable gain for an oscilloscope front end. R7 in the figure is the gain control, and a simple preamplifier is also shown . When a gain of more than 10 times is required, a preamplifier is needed .
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