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## Voltage gain calculation formula (opput amplifier gain calculation formula):

Gu = 20lg（Uo/Ui）= 20lgAu

In the formula, Uo is the output voltage, Ui is the input voltage, and Au is the ratio of Uo/Ui.
Gu is the voltage gain, and the result is 20 times the logarithm of the quotient of the output voltage to the input voltage, in units of decibels dB.

For example: 40dB means that the ratio of the output voltage to the input voltage is 100 times.

 Parameter input: Inverting amplifier (A) Rin: k Ohm Rf: k Ohm Non-inverting amplifier (B) Rin: k Ohm Rf: k Ohm
 Calculate: Output result - Amp-A: Reverse gain Gain = - Output result - Amp-B: Non-reverse gain Gain = Note: In order to operate normally, if a single power supply is used, the non-reverse OP amplifier must be associated with the ground. If V- is grounded, then the + input must have a 1/2V+ voltage drop, which can be obtained by resistor divider. Convert to db value db = (Vg)log X 20 or db = 20 log Eout/Ein or (Eout/Ein)log X 20