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Old 11th December 2012, 03:01 PM   #31
wilkes5 is offline wilkes5  United States
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off the subject. if given two boards (each with it's own power supply) rated at 140 rms bridged at (believe 1 ohm). can you combine the speaker terminals of both to have 280 rms? would you need a volt meter to adjust gains to same power?

need to power a 4 ohm 250rms sub
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Old 11th December 2012, 04:07 PM   #32
MarianB is offline MarianB  Romania
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You insist on asking for a bridge amp at that power but you do not seam to understand 2 things ( amongst others ):
1.Almost any audio power amplifier can be bridged, worst case scenario you need a phase shifter;
2.Bridge config puts much stress upon the power devices, enormous at over 1kW of power and more so in low impedance speakers, you need a real hefty cooling system;

So if that much power is mandatory on your car ( although you would need ear plugs to avoid loosing your hearing altogether ), that i would suggest sticking with single ended power amplifiers, be they class B or D ( although D is far more effycient but much more complex ), i would still suggest Class B for it's simplicity, and you really should start with lower power so you wount need to change the alternator, maybe even the battery, and you wount need extreeme cables for the power lines.
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Old 31st December 2012, 05:32 AM   #33
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Originally Posted by wilkes5 View Post
just finished 1st semester of electronics in college. all we did was learn basic DC circuits and how to calculate total resistance/voltage/current/etc

Dude, WTF??? First tell us how a Bipolar Transistor or a MOSFET works! Then learn how oscillating a high frequency into a transformer can be used to step-up a voltage, then rectify it through diodes to get a DC voltage from that. Then feed this high DC voltage into your amplifier circuit! If this sounds too complicated, then read on...............

Try designing a 100W SMPS first, and actually learn how the circuit works. You can't get what you want by simply getting a schematic!!! Once you get the schematic, you still have to build the thing and get it working!

You are asking these folks to help you design something that you don't understand how it even works!!! Many of these folks here have YEARS AND YEARS of experience with electronics, and you barely get Ohms Law!!!

Electronics education and school is a joke, hence the word BASIC, being that MOST of actual electronics knowledge is self learned by reading, research, trial and error and experience. Not just going over some repetitive lessons to complete the teachers payroll. Ask your teacher to explain how a transistor works, and see how much they really know, or are willing to teach you!!! Show THIS post to your teacher!!!!

You are asking for a SIMPLE way to build a high power SMPS, there is NO SUCH THING AS SIMPLE!!!
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Last edited by EWorkshop1708; 31st December 2012 at 05:42 AM.
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Old 31st December 2012, 06:11 AM   #34
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Originally Posted by wilkes5 View Post
what is the most basic audio circuit you can think off for the audio section? can anyone lay it out like 1/2/3. it receives the rca and then uses power to add power to such rca signal out to the speaker turminals?

If you can get this circuit to work, then you can move up to bigger amp circuits.

Circuit has approx gain of 10. RCA goes to input, speaker on output.
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Last edited by EWorkshop1708; 31st December 2012 at 06:18 AM. Reason: typo schematic
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Old 4th June 2015, 04:59 PM   #35
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Hello Everyone, I have been done some job with SMPS but mostly with PC power supplies, my friend brought me SSL EV5000D an 5000 watt car amp wich has been burned. there were 16 IRFZ44N mosfets in the supply, 8 of them were dead. I replaced them but the new ones burned when I connected it to the battery. Then I found some information about the amp. they told that wire gauge has to be very thick but when I replaced the mosfets and tried again they burned again. I have no experience with car amp PSU. Any ideas where to look for the problem?
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Old 4th June 2015, 06:32 PM   #36
infinia is offline infinia  United States
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