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Power supply dilemma...
I have bean nominated to set up my dogs club PA system...
They have given me a PA system but there is no power supply... It says on the back DC 12V 300mA On looking in my store / study I have found two power supply's. Namely First one: Rated: output: 12V 150mA Second one: Rated: output: 13.8V rated current 3A Max current 5A To me the one is too weak the other too strong. Can I use either of them? or will I have to fork out money and go and by one? Thanks for help. |
#2
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Power supply dilemma...
In article ,
D Shadford wrote: I have bean nominated to set up my dogs club PA system... They have given me a PA system but there is no power supply... It says on the back DC 12V 300mA On looking in my store / study I have found two power supply's. Namely First one: Rated: output: 12V 150mA Second one: Rated: output: 13.8V rated current 3A Max current 5A To me the one is too weak the other too strong. Nope, not quite. The first one, only able to supply 150 mA, is inadequate. But the second one, which can supply up to 3000mA, is adequate: if the system you want to power consumes 300 mA at 12V, it wil consume 300 mA whether it's hooked to a 300 mA supply or to a 3000mA supply or to a 30000000mA supply. A supply with a higher current capacity will not FORCE more current into the system than the system needs. So, the second supply will work fine, EXCEPT... The second one sounds like a car=-battery substitue supply and therefore may not have sufficient filtering or regulation. The result may be added num or noise. Also, it's running a little over, at 13.8 volts. That may not be a problem unless the PA system you're hooking it to has veryb little margin built in. Can I use either of them? or will I have to fork out money and go and by one? If it were me, I would find a good quality, 12 volt, well filtered and regulated supply capable of supplying at least 500 mA or more. You'd be better off noise wise that way. Such things are reasonably available and not hugely expensive. -- | Dick Pierce | | Professional Audio Development | | 1-781/826-4953 Voice and FAX | | | |
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