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Meter/ Data Acquisition Amplifier

2016-10-16 14:45  
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Meter/ Data Acquisition Amplifier
The LM385-2.5 injects current into the summing node through an adjustable resistor with a value near 1 megohm. A good-quality fixed resistor near 900k and a 200k potentiometer would be a good combination. The zero pot is adjusted to get an output near -10 volts with the input grounded (assuming -10 volts is the negative limit of the data acquisition device - other offsets are possible). The gain will be near 5 with no gain set resistor, and will reach about 100 with a 41k resistor. The zero might vary slightly when the gain is changed. Use a good-quality 3.9 megohm resistor. Lower values may be used for all the gain-setting resistors.