To date i have only built one circuit using a lm386 chip and it was the most basic build i could find. So working and planning wondering about a t amp build using a 2x15 watt (10 rms) 8 ohm chip board. With a warehouse guitar speaker 10" speaker 20 watts rms. I know the t amp is 2 channel and not bridgable the plan was to use one channel and put 2nd channel as a output jack for future expansion. Also planned was a ruby cricket style pre amp for the input to it for tone controls and such.