Overview
With this circuit you will be able to use any small radio, cassette recorder, WALKMAN etc. in your car without having to use batteries because its operating voltage is lower than 12VDC. It can also be used as a power supply with 3 different, selectable, output voltages with a single 12V transformer. Input voltage: 12V. Output current: 800mA. Output voltage: 6, 7.5, 9VDC.