DC controlled amplifier, input plus or minus 12v, amplification step unit is 1, 1~512 times step adjustable, flexibility is better than integrated controllable gain op amp, op amp design uses OP07, supports zero adjustment. Students who need higher bandwidth can directly use OP37 instead. If it is used as AC amplification, please connect an external coupling capacitor in series.
Due to the physical characteristics of the relay, this solution is not suitable for applications where amplification is quickly switched.
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