Dunno about car amps much but if the rails vary that much within the usual lead acid voltage range then I would say its pretty sketchy🙁
It surely is a class B push pull design with heaps and stacks of feedback.
You should really from an engineering view point build a dual rail supply.
Thing is two PC supplys or a good 800W one will do the trick perfectly, just remember to load up the 5V rail or they wont power up.
Once you have it running I am sure you will realise its failures. This is good because I guess you will decide on a dual rail supply for it first. Then given that it has sufficient heatsinking you may chose to redesign the bias circuitry and run more into class A(less power but way better) be sure to fully read up on feedback in push pull amps.
I think you could learn a lot by playing with your amp. Good luck and have fun.
Cheers Matt.
It surely is a class B push pull design with heaps and stacks of feedback.
You should really from an engineering view point build a dual rail supply.
Thing is two PC supplys or a good 800W one will do the trick perfectly, just remember to load up the 5V rail or they wont power up.
Once you have it running I am sure you will realise its failures. This is good because I guess you will decide on a dual rail supply for it first. Then given that it has sufficient heatsinking you may chose to redesign the bias circuitry and run more into class A(less power but way better) be sure to fully read up on feedback in push pull amps.
I think you could learn a lot by playing with your amp. Good luck and have fun.
Cheers Matt.
Tony chill out, everyone has to learn somewhere. High current low voltage supplys are ideal for a bit of realisation😀
Besides the OPs amp seems ideal for learning on/in. Would really make a better load for checking PSUs though🙂
Each to their own and I gleaned a lot of SS amp learning from messing with just such things.
Cheers Matt.
Besides the OPs amp seems ideal for learning on/in. Would really make a better load for checking PSUs though🙂
Each to their own and I gleaned a lot of SS amp learning from messing with just such things.
Cheers Matt.
This is turning into a arguement ._.
all i wanted is 14.4v NOT to replace the dual rail class B SMPS.
all i wanted is 14.4v NOT to replace the dual rail class B SMPS.
It would NOT surprise me that a Car Amp internal SMPS (like this one) is non-regulated. It's easier to design and has safer current limiting & they can get away with it with such a narrow operating range 12-15. Even the ESP project site shows a schematic of a DIY one.
It is regulated , just that it has a limited current draw @ 12v .
14.4v triggers a second regulator 🙂
That's why it's called "Duo-B Circuit"
What if the supply voltage varies around the 14.4V trigger point. Say from 14.2Vdc to 14.8Vdc?
what if the supply voltage is a steady 14.5Vdc with a steady mains ripple superimposed amounting to 100mVpp at quiescent current, rising to 900mVpp when delivering 10Adc?
What happens if the SMPS demands 20Adc or 30Adc or 50Apk?
It Begins from 13.2v .
10Adc sounds a little too much , but will a 400VA transformer cause anything to dim out ?
14.4v @ 400VA gives around 27.8A which is alot , but that is the absolute limits of the tranny .
That is IF , in best cases , but i think 20A is very good for my amp already .
It's max output is here : http://www.diyaudio.com/forums/musical-instruments/186267-alpine-mrv-f400.html
And AND ... it is underrated 20% to 30%
When you have your 14.4Vdc supply built and operating.
You can measure it for us and give us a comprehensive run down on amp/smps/linearsupply performance.
You can measure it for us and give us a comprehensive run down on amp/smps/linearsupply performance.
DJ you probably could get away w/o a slow start, 400 VA is right on that edge depending on how beefy you make your diodes and on/off switch.
That's easier then said , didn't i write i NEED 14.4v power supply ?
Oh sorry i saw a 15v version .
Seriously ? If this proves to be better and much cheaper then a traditional massive toroid + diode + big caps + soft start ,
i'll go with it , but what shocks me is , why is there 50A inrush current ? What's up with that ?
I never heard a SMPS had so MUCH inrush current .
I used the 12volt version set to 14volts to keep my car batteries topped up for 8 or 9 hours at a car show recently where I was playing the stereo off and on loudly during the day.
I've seen huge inrush currents listed for most switchmode powersupplies, I don't get it either.
I've seen huge inrush currents listed for most switchmode powersupplies, I don't get it either.
Wiki says they have a much larger inrush current then even ******* TOROIDS ?!
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