Question

An analyst is interfacing a chromatographic detector with an output of ±1.00V to the ±10 mV input of a strip chart recorder. The input impedance of the strip chart recorder is 1.0 kOhm. The analyst's lab has a small collection of electronic parts:

Resistors: 1.0 kOhm, 9.0 kOhm, 10.0 kOhm, 99.0 kOhm, 100.0 kOhm, 1.00 MOhm

Adjustable power supply: ±0-15 V

CA3140 operational amplifier

Design and write down an electronic circuit solely based on resistors in the lab that is designed to interface the output of the chromatograph to the strip chart recorder without overloading the recorder. Discuss the main disadvantage of this circuit and show any appropriate calculations that support your position.

Answer 1