Compass Liberty 150 super mod

[DavidB]

Mods include additional series battery, series reference LED change to create +5.5V and -5.5V power supply voltages, Added small SMT bd with dual op amp, 2 transistors and other 0402 components to increase the threshold sensitivity and improve the sound quality of the disc mode on deeper targets. Performance has been improved to be at least equal to the XP models.

[magic12]

Can you add ground Balance to this model is so how?