An electronic tuning system includes an electronic tuner for adjusting the
predetermined control voltage of a voltage controlled oscillator (VCO) to
tune the local frequency signal to radio waves on an arbitrary channel in
accordance with channel selection information. A booster circuit boosts a
source voltage to generate a boosted voltage in order to ensure the
predetermined control voltage. A non-volatile memory stores the channel
selection information in response to a predetermined write voltage. The
boosted voltage of the booster circuit is utilized as the predetermined
write voltage.