This brick contains the LMC662 operational amplifier (OP) with a very low input current of 2fA. This means that the input resistance is, conversely, over 1 T?. Depending on the circuitry, the OPV can amplify the voltage differences at its input by up to 200,000 times. The gain factor is determined by the ratio of resistances between input and output. The level of amplification is determined logarithmically in Bel (B) or decibel (dB), its tenth part. The voltage gain of 200,000 corresponds to approximately 126 dB.