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Electronics Forum / Electronics / January 2008power supply....
Hi! Would appreciate some help. Was thinking of using a car radio at home. Specs read current consumption 1.5A (at .5W). The fuse is 5A. DC power supply should be at least 1.5A but can I go up to 4A without harming the radio? Not sure if I would gain any improvement in sound. Thanks! Please cc: my email address if possible. Louis Lou707@msn.com >Hi! >Would appreciate some help. > >Was thinking of using a car radio at home. Specs read current >consumption 1.5A (at .5W). --- Something's wrong there. Power is equal to the product of voltage and current, so: P = IE = 12V * 1.5A = 18 watts or, for 0.5W: P 0.5W I = --- = ------ ~ 0.042A E 12V --- >The fuse is 5A. > >DC power supply should be at least 1.5A but can I go up to 4A without >harming the radio? --- Yes; the radio will only draw the current it needs. --- >Not sure if I would gain any improvement in sound. --- As long as the power supply looks like a voltage source the quality of the sound won't suffer. ---  SignatureJF >>Hi! >>Would appreciate some help. [quoted text clipped - 14 lines] > I = --- = ------ ~ 0.042A > E 12V I think the OP's specificatins rate current at .5W of audio output... <g> >--- > [quoted text clipped - 5 lines] >--- >Yes; the radio will only draw the current it needs. Assuming the power supply is regulated and doesn't allow the voltage to rise significantly as current drops. >--- > [quoted text clipped - 4 lines] >of the sound won't suffer. >--- Assuming the power supply is regulated and doesn't allow the voltage to change significantly as audio levels change. >>>Hi! >>>Would appreciate some help. [quoted text clipped - 17 lines] >I think the OP's specificatins rate current at .5W of audio output... ><g> --- Ok... --- >>>The fuse is 5A. >>> [quoted text clipped - 6 lines] >Assuming the power supply is regulated and doesn't allow the voltage >to rise significantly as current drops. --- See "As long as the power supply looks like a voltage source"... below. --- >>>Not sure if I would gain any improvement in sound. >> [quoted text clipped - 5 lines] >Assuming the power supply is regulated and doesn't allow the voltage >to change significantly as audio levels change. --- What do you think a voltage source does? SignatureJF >>>>Hi! >>>>Would appreciate some help. [quoted text clipped - 50 lines] >--- >What do you think a voltage source does? You know, I know, but does the OP know? <g> >>>>>Hi! >>>>>Would appreciate some help. [quoted text clipped - 52 lines] > >You know, I know, but does the OP know? <g> --- Dunno, but he will if he reads and understands this: http://en.wikipedia.org/wiki/Voltage_source SignatureJF |
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