| http://www.w3.org/ns/prov#value | - Typically the measuring device is a sample-and-hold circuit followed by an analog-to-digital (A/D) converter and subsequent processing circuitry.The buffer amplifier stage 194 in one embodiment is a second field-effect operational amplifier U2 (op amp TLC2272) and is used to achieve an approximate gain of 20 dB. A 15v DC power is supplied by a power source, such as common dry cell batteries, altho
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