12V to +-20V Automotive Power Converter Diagram
The limitation of car supply voltage (12V)
forces to convert the voltages to higher in order to power audio
amplifiers.
In fact the max audio power x speaker (with 4 ohm impedance) using 12V
is (Vsupply+ - Vsupply-)^2/(8*impedance) 12^2/32 = 4.5Watts per channel,
that is laughable...
For powering correctly an amplifier the best is to use a symmetric
supply with a high voltage differential. for example +20 - -20 = 40Volts
in fact 40^2/32 = 50 Watts per channel that is respectable.
This supply is intended for two channels with 50W max each (of course it
depends on the amplifier used). Though it can be easily scaled up or
the voltages changed to obtain different values.
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