external voltage booster can also be used to provide the P110 with a 12V
input where the battery used is below 8V.
The amplifier will output up to 25Watts, but it is recommended that the
power is kept to 10W to minimise heating within the unit. The speaker can
be either 4 or 8 ohm. The output volume is set using R18. Set the volume as
high as required without distorting the sound.