I'm getting a little concerned as my new LM3886 chipamp.com amp gets a tad warm on the heat sinks after 2 4 minute songs on full volume, hot to the point you cant touch them for more than a second.
The amp itself seems to be working pretty much spot on apart form the heat problem, i have a 225va 230v 2x25v secondary transformer with a p4 heat sink on each chip. is it just a case of not enough heat sink or is the supply to big or some other problem?
The amp itself seems to be working pretty much spot on apart form the heat problem, i have a 225va 230v 2x25v secondary transformer with a p4 heat sink on each chip. is it just a case of not enough heat sink or is the supply to big or some other problem?
lm3886 has thermal protection, dont wory.if you run the chip hot then Spike protection triggers much earlier than the cold specifications (Tc=25degC).
If you require good performance then run the chips as cold as possible (Tc<=40degC).
If you want better performance use higher impedance speakers.
If you want better still, then use high efficiency, high impedance speakers.
If you require good performance then run the chips as cold as possible (Tc<=40degC).
If you want better performance use higher impedance speakers.
If you want better still, then use high efficiency, high impedance speakers.
A little simplistic.
High impedance isnt the main issue - as impedance is a vector sum, and not a linear sum. So you can have a speaker with high efficiency and high impedance, that has a nasty as hell phase pofile that amps really do not like....
Back to the question in hand.
the 3886 is a dual power opamp. so that little heatsink will be dissipating 50+ W insufficent area will make its temperature rise quickly... Not a great plan, as SPIKE sounds truely nasty.
So a bigger heatsink is in order if you regularly use it at full tilt. It will need to be large, black, and expensive, but the chip will love you for it.
I do however feel the need to ask what kind of ear protection you are using - even with a mid 80s db efficient speaker, you will be cranking more than enough volume to cause long term damage, especially if you repeat it on a regular basis...
Owen
High impedance isnt the main issue - as impedance is a vector sum, and not a linear sum. So you can have a speaker with high efficiency and high impedance, that has a nasty as hell phase pofile that amps really do not like....
Back to the question in hand.
the 3886 is a dual power opamp. so that little heatsink will be dissipating 50+ W insufficent area will make its temperature rise quickly... Not a great plan, as SPIKE sounds truely nasty.
So a bigger heatsink is in order if you regularly use it at full tilt. It will need to be large, black, and expensive, but the chip will love you for it.
I do however feel the need to ask what kind of ear protection you are using - even with a mid 80s db efficient speaker, you will be cranking more than enough volume to cause long term damage, especially if you repeat it on a regular basis...
Owen
Im using full tilt when working in other rooms/garden but at the moment i feel the need to keep poping back to check she is ok, i havnt invested in a case yet so i suppose ill have to treat my GC to a prezzy and get one of these
i take it that will do the job nicely?
this one is from modushop.biz does any one know any other companys that ship cases like this to the uk?
i take it that will do the job nicely?
this one is from modushop.biz does any one know any other companys that ship cases like this to the uk?
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