Simple switching regulator by LM358 , 78L05

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This circuit uses a standard 78L05 low power 5v regulator in a novel way - as a voltage reference to a comparator. When the output voltage is LOWER than 5v, the output of the comparator switches high, turning on the transistor. The output voltage rapidly rises and once it is HIGHER than 5v, the output of the comparator switches low, turning off the transistor. The 0.33uF mono capacitor provides some smoothing and prevents oscillation in the multi-megahertz region. Under no load this circuit oscillates at about 32KHz. The diode and 470uF electro provide isolation and extra smoothing to produce an almost pure DC output.

Source : http://www.rowan.sensation.net.au/electronics/stepdown2.html

This entry was posted on Friday, July 13th, 2007 at 3:23 pm and is filed under switching power supply. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.