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The electric programmable gain amplifier circuit

2014-11-23 00:36  
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The electric programmable gain amplifier circuit
In the figure is the electric programmable gain amplifier circuit which is used in amplifiers. AOI has a LDR whose central head is connected with the ground, one side of it is connected with the signal channel, while the other with the control circuit. The signal amplifier consists of the op-amp A1, resistor R3, gain adjust resistor R2 and input resistor R5, the amplifier gain is shown in the figure.