power transformer - 1200mA or 1600mA?

[mysticman]

Hi - I have an mp3 speaker kit which has a mains transformer rated at 9volt 1600mA. The transformer has broken. I have looked for other transformers, but the highest mA I have found is 1200mA. Would this still work with the speakers, or MUST I use a 1600mA?

[ianmunt]

Not recommended,it would be overloaded.Try Maplins.you may have to get a multi output unit and select the 9volt setting,also ensure you get the polarity (ie centre +ve or -ve )as required

[mysticman]

Thanks for that. Would it be the transformer that would be overloaded because the speakers would drain power?? I don't understand.

[The Builder]

At 9v, or whatever the voltage - the impedance (resistance) of the speakers would cause a current to be drawn from the transformer (Ohm's Law).............:o)

[ianmunt]

This might be what you are looking for. Part No LO6BR it can supply up to 2500mA,it can be set to various voltages so you would need to select 9, and as stated before you would need to ensure correct polarity of the output plug.

http://www.maplin.co.uk/images/300/l06br_with- new-lable.jpg

[ianmunt]

Sorry,wrong link Try this one.
http://www.maplin.co.uk/module.aspx?ModuleNo=4 9063&doy=27m12

[ACtheTROLL]

builder .... not quite

the transformer (psu) feeds the amplifier .... the amplifier feeds the speakers

mystic
(this is an over simplification) .... but - the psu delivers a variable .... but constant current to the amplifier based on the volume it needs to deliver .... and that's the problem .... because of the constant drain ... the psu will get hot HOT HOT
ianmunt's suggestion is spot on the max current @ 9v=1700mA ... so good call

[The Builder]

Thanks for that AC - I missed the bit about it being a mains transformer :o(
I thought it was an output transformer.............

[mysticman]

Thanks folks - excellent advice - happy new year!