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Class D Switching Power Amplifiers and Power D/A conversion

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Old 28th February 2012, 12:05 AM   #1691
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Default ucd 1200

Hi Sameerx1
nice pcb good to have dc protector pcb has holes for IRF250 and
IRFB4227PBF
WARM REGARDS
andrew lebon
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Old 28th February 2012, 07:40 AM   #1692
akraj is offline akraj  Bangladesh
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Default JBL Class D amp for Subwoofer!

Dear All:

I am planning to devlop a PCB of the attached Schematic, this is from JBL sub.

I know there are more simpler schematic out there but just thinking that this is well tested and all soft of protections are there.

Any comments not to do this? Thanks in advance to all.

https://www.cx.com/mycx/share/PYYgQ0...i_%5BET%5D.pdf

Thanks
Raj
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Old 29th February 2012, 01:02 PM   #1693
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For Andrewlebon

you can use any two amps for bridge with this! Amps must be the same as much as possible.

I use this schematic for this ucd amp. On out+ goes in of first amp and on that amp you conect + of speaker. On out- goes in of second amp and on that amp you conect - of speaker.

And that is all about full bridge. With this amplifeir this is very good schematic because in inputs of both amps you have op amps who is low impedance soruce of signal, that means you can use 4.7nF cap from input to gnd and you have low noise and full audio range. Before input (in1) on bridge adapter, I recomanded you 4.7K lin pot for volume!

All is power with +-15V
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File Type: gif Bridge adapter sema.gif (13.0 KB, 778 views)
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Old 29th February 2012, 01:11 PM   #1694
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If you build classic amp with two chanel, you can use my "Volume panel".

With this panel you have volume control for both chanel and easy can swich all amp in full bridge mod with bridge swich. When bridge is on, Led is turned on..

All is powered with +-15V and when is whole amp in bridge mod, then you use Ch2 pot for volume control

6 pins double swich that I use for this. It's no metter side of conection, only is metter conection of swich PARALEL to pins on pcb (like the swich is on top of pcb, if you understand me).

Now you'll know when is bridge mod turned on because led will turned on too.
Attached Images
File Type: png bridge 1.png (45.6 KB, 762 views)
File Type: jpg swich.jpg (13.5 KB, 727 views)
Attached Files
File Type: pdf bridge1.pdf (16.5 KB, 224 views)

Last edited by Dzony988; 29th February 2012 at 01:20 PM.
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Old 29th February 2012, 01:53 PM   #1695
norazmi is offline norazmi  Malaysia
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Dzony absolutely right, i already told him about it, use 2 amp pcb to make it bridge. Provided u need big PSU and enough current to get full power. +/- 50 vdc is enough in full bridge. Btw Dzony already posted bridge circuit and pcb, nice work.
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Old 29th February 2012, 02:10 PM   #1696
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hi my fren nirazmi,
hers is a nice bridge design
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Old 29th February 2012, 02:13 PM   #1697
norazmi is offline norazmi  Malaysia
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Lol

Your pcb worked? How does it sound? tell me about noise also.. if u have time
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Old 29th February 2012, 02:26 PM   #1698
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Full bridge is good for subwoofers in class D, because half bridge dont have strong "bum" bass . Only problem with full bridge is very high current and bus punping. Lots of capacitance needed in PSU to avoide bus pumping in rails and if you drive 4ohms speaker in full bridge, both of amps sees half of whole impedance = 2 ohms per amp...

What do you think, can IRFP250 run in full bridge on +-70V and 4ohms load?

I drive IRFP240 on +-50V and 4 ohms full bridge and everuthing is ok but mt transformer dont produce big current and before cliping in subwoofers I can hear big dostrosion and mechanical sound
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Old 29th February 2012, 02:33 PM   #1699
norazmi is offline norazmi  Malaysia
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IRFP250N yes why not, if you dont mind about thd. u need to setup proper gate resistor for it or u will need big heatsink

i did before full bridge with irf540N with 2 board and drive 6 15 inch speaker hard at carnival college start run 8:00 pm till 2:00 am, and its survive hehe voltage = +/- 48.9 vdc, 1 uf caps at each amp and 22 uh T106-2 no problem.
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Old 29th February 2012, 02:36 PM   #1700
norazmi is offline norazmi  Malaysia
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Dzony with original pcb mr ejtagle i dont face any bass pumping even in full bridge. Filter ur power supply with good filtering, 1uf 250 vdc at +vcc to gnd, -vee to gnd and +vcc to -vee. Mine use 6 1 uf 250vdc.
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