decibel calculation

[clapper62]

Hello All

I have this code​

Private Sub cmdCalcPowerDbGainLoss_Click()
Dim PowerGainRatio As Double
PowerGainRatio = Me.tboxOutputPower / Me.tboxInputPower

Me.tboxDbGainLoss = Log(PowerGainRatio) * 0.43429
Me.tboxDbGainLoss = Me.tboxDbGainLoss * 10

Me.tboxVoltageDbGainLoss = Log(PowerGainRatio) * 0.43429
Me.tboxVoltageDbGainLoss = Me.tboxVoltageDbGainLoss * 10 * 2

End Sub

It takes a given input power/voltage and and an output power/voltage and calculates
decibel gain/loss (accurately I think)

I would also like to enter an input voltage and a Decibel gain/loss and calculate the output voltage
but I can't figure out the equation to do it, math skills not so great

thanks

 

[combo]

See

https://en.wikipedia.org/wiki/Gain_(electronics)

combo