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12V to +-20V Automotive Power Converter (for audio amplifier)
Posted on Wednesday, November 17, 2010   •   Category: AC / DC Innveters

12V to +-20V Automotive Power Converter (for audio amplifier)

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.

     24V to 12V 400W DC Inverter
     500W 12 Volt to 220 Volt Inverter
     12V DC to 220V 100W Inverter
     12V to +/- 30V DC to DC Converter
     Car 12V to 50V DC Converter
     12V to 220V 100W Transistor Inverter
     500W 12V to 220V Inverter
     Simple DC to AC Inverter
     500W Mos-Fet Power Inverter from 12V to 110V/220V
     DC13.8V to DC250V Inverter Circuit
12V to +-20V Automotive Power Converter (for audio amplifier)

 

Build Accurate LC Meter and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils. LC Meter can measure inductances starting from 10nH - 1000nH, 1uH - 1000uH, 1mH - 100mH and capacitances from 0.1pF up to 900nF. The circuit includes an auto ranging and reset function to make sure the readings are as accurate as possible ... [more]



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