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3 Threads found on Switching Power Supply With 7805
Is there anyone experienced with 7805, which input is supplied by switching power supply ? I use +12 V from regular PC power supply. Just now, it went broken. Is it wrong to use switching PS for 7805 input ?
Hi ! You did not inform what are the currents required. The 7805 will become hot only if the current is high, for low currents a heatsink attached to it could be the solution (and cheapest). I suggest you to use a LM2976-5.0 switching regulator, with the 18Vdc input and regulating to 5Vdc on the output. You need only as additional (...)
if its only for testing, use the power supply from an old PC (+ and -12, + and -5) regards magnus PC power supplies are switching devices, won't even start with a 30 mA load.

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