# Math Help - electronic amplification

1. ## electronic amplification

Does anyone know how to calculate the overall gain in dB,

example, something like

10dB, 15dB, -8dB, respectively, calculate overall gain in dB

Also, if you know an amplifiers voltage gain, how do you calculate its gain in dB's

Thanks anyone who knows this stuff.

2. Originally Posted by bobchiba
Does anyone know how to calculate the overall gain in dB,

example, something like

10dB, 15dB, -8dB, respectively, calculate overall gain in dB

Also, if you know an amplifiers voltage gain, how do you calculate its gain in dB's

Thanks anyone who knows this stuff.
OK assuming the overall gain is for a multi-amplifier stage with those respective gains in dB. You simply add the dB values. So you get 17dB.

To get gain in dB from Voltage gain do:-

Gain (dB) = 20 log (base 10) (Av) where Av is the voltage gain.