Re: Voltage at volume control of bitx40??

 

Hi John,

The lm386 often states a common output power of 125mW.  This is actually a pretty strong volume level, but looking at it will give you an idea of what type of voltage you may see.  Po = V^2/R so 0.125W = V^2/8ohms so V^2 = 1 and V=1  This is an RMS value so peak would be 1.4V and peak to peak 2.8V.

Recall though that we need a doubling or halving of power to notice a  difference in volume, so you could actually be seeing voltages much less than this.

73,


Mark.

Join BITX20@groups.io to automatically receive all group messages.