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I build it and not working but i have to try some problems...
It`s my fun and i now better to buy an amp pack about 30-50$
The step-up topology is not absolute work and in real it is very weak .
It looks a pretty standard switch-mode design, assuming you've built it correctly I would imagine the problem is down to your transformer not been good enough? - did you use the specified core?.
Hi,
I try to make power supply for car audio amp from this schematic:
**broken link removed**
Any body do this or some like this project?
It`s Work?
right core? there is no "right core" at 60Hz. the circuit is a hobbyist grade AC inverter
right core? there is no "right core" at 60Hz. the circuit is a hobbyist grade AC inverter
I suggest you look again, as you are completely 100% WRONG!!.
It's a high frequency switch-mode PSU for generating +/-30V or so for running high power amps in a car.
my bad ... i missed the units for one of the parts of the equation. 60KHz not 60Hz. MOST switching cores would work. it is more important that the inductance of the primary and saturation current be high enough.
having actually seen what they are doing as opposed to looking, it seems overkill... simple boost and inverter circuits would suffice at those conversion points. it does not make any sense to have an over complicated power transformer to save on silicon when two simple inductor switchers would suffice.
I suggest you study it further, and consult every single commercial unit I've ever seen or heard of - you need a transformer!.
commercial units put profitability over everything including reliability. it is more profitable to do a warranty replacement on 5% of all shipped units when 50% will be repurchased in a 3 years than it is to build something that will last 10 years. it is also more profitable to have a custom transformer built, incurring thousands of dollars in NRE, to pay $3 for the transformer instead of $4 for 2 inductors.
on the other hand it makes no sense at all for a hobbyist to buy a $20 off the shelf switching transformer when 2 $4 inductors will do fine
You can't have it both ways
The commercial manufacturer would be paying as LOT less for two inductors than he would for an expensive transformer - it's done with a transformer because it's by far the best way.
actually i can... what it costs for a mfg custom in the millions used in consumer goods is a huge difference from what a hobbyist would pay.
How does that affect the same manufacturer having a transformer custom made or a pair of inductors custom made - your point (as I read it) was that it would cost much more for the inductors. Particularly as the number of inductors would be double the number of transformers.
there is some confusion then... my points (multiple) were that it is much less for a hobbyist to build multiple inductor based converters and much less for a manufacturer to have a single transformer based multiple output converter.
The power supply can supply 5A at 70V which is 350W. Ampliifiers get hot so their max output is about 200W and 150W is heat.My problem in now is about current output it is about 50ma!!!!! and if i sink more current the input current extremely rise up about 5A.!