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Old 25th October 2014, 04:14 AM   #1
den701 is offline den701  United States
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Default LME49830 board wiring connections

This question is in regard to wiring connections for a 300 watt mono amp board with LME49830 driver and 2SK1530/2SJ201 MOSFET s. The board schematic is shown below.

Amp Board Specification:

Status: Class A and B (can be adjusted according to the CPI (A))
Output power: 300W * (4 ohms) <* V = 60V
Operating voltage: the recommended voltage driver stage 55V / output stage 50V
Input Interface: mono signal input
Output Interface: mono speaker output
Power: dual-supply operation, the voltage drive and current power output stage separate power supply voltage level and current level can also be combined power and freedom of choice.
PCB size: 215 x 93.5 mm

Also below is a photo of the terminals present on the amp board. My power supply DC outputs - Vee and +Vcc will be connected to terminals labeled -Vee and +Vcc. What voltage source and of what voltage and current is expected to be connected to terminals labeled -V and +V ? Or do I even need to use the -V and +V terminals?

I can not sort this out from the schematic due to my limited technical knowledge. So looking for help.

The answer for this question may be given in the Amp Board Specifications:
Power: dual-supply operation, the voltage drive and current power output stage separate power supply voltage level and current level can also be combined power and freedom of choice.

I do not understand what this is saying either. It might be a language translation glitch.

Dennis

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Old 25th October 2014, 06:15 AM   #2
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Interestingly, your schematic is not for the amplifier you have described.
Suggest you contact the manufacturer and ask for the correct schematic.

However, IF the manufacturer uses the same notations as on this schematic, I could assume that the V+ and V- is for the input stage, and VCC+/- is for the output stage.
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Old 25th October 2014, 03:52 PM   #3
den701 is offline den701  United States
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I did notice right off that printed specs on the CB label the driver chip as a 49810. The actual chip is inscribed as a 49830. It immediately worried me but begin to think that maybe the pc board design and layout for either the 49810 and the 49830 were very similar or the same. I hope it is not a bogus board coming out of China! The company Doukmall seems to have a lot of sales and good feedback on Ebay. They have been somewhat helpful providing a bit of texted info and the schematic posted here.

I found the photo below online showing 2 of these particular boards, PS, and transformer in some form of preliminary wiring configuration. The image is not clear and detailed enough to see exactly which terminals are connected to what wires but It appears that the output and input stages Vcc, Vee and +V -V are connected in parallel to the PS Vcc and Vee outputs. Could this be possibly what is referred to as "can also be combined power and freedom of choice" stated in the amp board sellers specifications?
Dennis

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Last edited by den701; 25th October 2014 at 04:05 PM.
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Old 25th October 2014, 04:21 PM   #4
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If we can trust the schematic, you only need to connect the Vcc/Vee (or actually Vdd/Vss on your case) and it will work.
For running the input stage on higher voltage, you connect the V+/- terminals to your PS.
I would recommend using an additional PS to power the input stage, as that will prevent the output stage from interfering with the input stage.

By the way, if all the parts are original in your boards, you have an excellent amplifier on your hands now... :-)
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Old 25th October 2014, 05:44 PM   #5
den701 is offline den701  United States
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I see now that the output transistor location on the PC are also mislabeled also. I was hoping these boards would offer quality performance. As you say if the board components are legitimate it should work well. I will keep my fingers crossed. Photo of the actual board below.

To make sure I understand correctly, if I wire only my PS rail outputs to terminals -VCC and +VCC accordingly and ground, not using the +V and -V terminals at all, the board will operate. Though better performance can be achieved connecting the -V and +v in parallel with my same -VCC and +VCC rail outputs . And if I would choose to provide a second PS board and connect -V and +V board terminals to it, even higher quality performance will be attained.
Dennis
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Last edited by den701; 25th October 2014 at 05:52 PM.
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Old 25th October 2014, 07:09 PM   #6
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I would say, if you use only one PSU to power the board, do not connect the V+/- terminals. That way you will not discharge the input stage smooting capacitors to the output stage during peak current demands...

Best performance with a separate PSU for the input stage.
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Old 25th October 2014, 07:55 PM   #7
AndrewT is offline AndrewT  Scotland
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You need the retailer to supply the correct wiring information.

If they are incapable of supplying that then you should be sending the kit back and demanding a full refund.

If without the correct wiring info, you make a mistake and damage the kit, who pays for repairs?
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Old 26th October 2014, 08:40 PM   #8
den701 is offline den701  United States
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Andrew is correct that I should not be having these issues with inadequate technical support. Oh well, I guess it is another instance of "live and learn", and try to make the best of it. I did receive more info last night from another DIYer using similar boards. I've posted it here where others might be able to make use of it. I now realize to do this right I will have to consider buying more in the way of transformers and PSUs. Thanks for the suggestions so far.
Dennis

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Old 27th October 2014, 07:05 AM   #9
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Your fellow diyer has probably mislabelled the outputs in your circuit.
The input stage needs higher voltages than the output stage.
If your circuit is used as is, you will use a lot of power just to heat the environment, a lot.

Anyways, if you decide to go with higher rail voltages for the input stage, use only a couple more volts for it.
Lets say that 42v+/- (as you have on your circuit now) for the output stage,
and for the input stage +/-45v max...

That way you make the chip still clip before the output stage during the peak demands (you of course try to avoid clipping totally in the first place...).
The chip clips nicer than the mosfets.

And, if you bias this, lets say, only to a moderate 300mA. That 300mA will only make about 45W (in stereo - efficiency) of extra heat, nothing else, no sound quality, just heat.
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Last edited by palstanturhin; 27th October 2014 at 07:08 AM.
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Old 28th October 2014, 03:57 AM   #10
den701 is offline den701  United States
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I am so glad you tech savvy guys are out there willing to help!

So now as I am deciding to spend more money, to double check, is one of my options to power up the 2 amp boards using only the driver stage + Vcc -Vee terminals on the boards not connecting any power to the output stage +V and -V terminals? If this works I can make do with what I have and not buy any additional hardware. Knowing that this configuration will not give optimal performance but at least functional for the time being. I could do the addition of another power supply and transformer at a later date. I have room in my chassis for the additional stuff.

If I want to, or have to purchase the additional transformer and power supply to make these boards work, from the last reply I understand that the other fellows schematic is either miss labeled or he has it wrong showing more voltage going to the output stage then to the driver stage. I have already been looking for an additional transformer and have a line on a used quality toroidal 50/50 500 VAC. Speculating that this transformer after the caps will provide no load + - 70 volts. I would plan to use this as the driver stage voltage supply and my present 500 VAC toroidal showing no load + -59 volt to power the output + V and -V terminals. There will be 10 to 12 volt imbalance between the driver and output supplies. Will this condition also cause an increase in operating temperature with no improvement in performance and only cause a waste of energy and excess heat? Is the ideal situation that the supplies be nearly equal with the higher voltage supply going to the driver?
Dennis
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