Current spliter
i want use power supply of 5v x 20a . want 4 strips of led lights each 1 draws 5a of current. can't afford buy 4 strips @ same time , seems stupid buy 4 separate power supplies @ 5v x 5a.so wondering if use current splinter circuit @ 5a per leg can use 1 @ time. add strips when i'm able receive them. if makes sense all. suggestions appreciated. can make circuit wondering if needed load on other 3 legs keep 5a on other legs.
ampere rating on power supplies max, not rating not fixed quantity. @ ohms law: if voltage , resistance* fixed, current automatically comes out fixed value.
most power supplies fix voltage. power supply 5v 0-20a** power supply. voltage fixed, current set load resistance.
there constant current supplies, e.g. 5-20v 1a. adjust voltage such current flows. need them high power leds, not strips.
that said, 20a pretty massive. need pretty thick cables - more 1,5mm²~=15awg commonly used in mains wiring in germany. americans seem have rather 12awg, makes sense since have lower voltage, i.e. higher current same power.
* plain led resistance not fixed, strips 1 or other way, @ least in first order.
** there 3 reasons not huge power supplies: 1) price, 2) less efficient under lighter load, aim around 70-80% load best efficiency. 3) can more dangerous. if make mistake , send 20a on connection built 500ma, bad things happen (something between massive damage , fire). 1a supply have less drastic effects.
i think should have sticky thread explains these basics.
most power supplies fix voltage. power supply 5v 0-20a** power supply. voltage fixed, current set load resistance.
there constant current supplies, e.g. 5-20v 1a. adjust voltage such current flows. need them high power leds, not strips.
that said, 20a pretty massive. need pretty thick cables - more 1,5mm²~=15awg commonly used in mains wiring in germany. americans seem have rather 12awg, makes sense since have lower voltage, i.e. higher current same power.
* plain led resistance not fixed, strips 1 or other way, @ least in first order.
** there 3 reasons not huge power supplies: 1) price, 2) less efficient under lighter load, aim around 70-80% load best efficiency. 3) can more dangerous. if make mistake , send 20a on connection built 500ma, bad things happen (something between massive damage , fire). 1a supply have less drastic effects.
i think should have sticky thread explains these basics.
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