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Old 1st February 2016, 04:44 PM   #1
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Default Need Help With Connecting Supply to LME49810 AMP (Servo)

I purchased the LME49810 Top Audio Power Amplifier Kit Board Mono 400W DC Serve (Servo) from LME49810 Top Audio Power Amplifier Kit Board Mono 400W DC Serve | eBay

I'm going to use it to drive a Extended low-frequency sub (ESP Project 48a) while I use the MyRef LM3886 for the main amp. However I have no idea where the supply voltages are to be connected to this LME49810 board. Here's what it looks like (pls see attachment.)

FYI:
I plan to use the following Xfr and use an 8ohm sub-woofer (JBL GTO1214D 12-Inch Die Cast Dual Voice Coil Subwoofer)
Pry: 2x120 VAC @ 50 Hz
Sec: 55-0-55 VAC @ 4.54 A = 500 VA
Sec: 60-0-60 VAC @ 0.25 A = 30 VA
Capacity: 530 VA
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File Type: jpg Sub-Amp-PCB.jpg (215.7 KB, 175 views)
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Old 2nd February 2016, 12:40 AM   #2
tomchr is offline tomchr  Canada
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I suggest you contact the vendor for some documentation on how to use the board.

Tom
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Old 2nd February 2016, 01:29 AM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by varun21 View Post
I have no idea where the supply voltages are to be connected to this LME49810 board.
It's likely that the 3 pin connector gets DC voltage that is Zener regulated down to +/- 15V for the op amp.
The other connector is for the power amp rails, up to +/- 60VDC. Can you post a photo of the bottom of the pcb?
You do need a schematic and other docs.

Last edited by rayma; 2nd February 2016 at 01:37 AM.
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Old 2nd February 2016, 05:26 AM   #4
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I doubt Chinese vendors even know what they are selling. That fellow sells shoes, handbags and electronics etc. They are just suppliers I guess. And they are on a month long vacation owing to Chinese new year.

The LME49810 amp usually requires dual supplies (one for LME49810 and another for the current amplifier/power-transistors). And there should be a difference of 5v between these supplies. I guess I don't know how to provide power to LME49810. The power to power-transistors is +/-Vcc. Could they be using a voltage divider to power LME49810 from the power-transistor supply?

Here's the reverse side (I tried to clean with alcohol but it didn't work).
Attached Images
File Type: jpg Sub-Amp-PCBv2.jpg (143.0 KB, 155 views)

Last edited by varun21; 2nd February 2016 at 05:30 AM.
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Old 2nd February 2016, 08:06 AM   #5
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Electrical Characteristics (in Chinese English; if it helps):
Work status: type A and B (according to the need to adjust into the CPI)
Output power: 400W (4ω) <* V = 60v
Operating voltage: the voltage drive level Recommended 65V; current output 55V, the current output level voltage is always lower than the voltage drive level voltage of 5V; speaker protection voltage AC20-24V, working current <100MA available to the speaker protection circuit
Input interface: mono signal input
Output Interface: mono speaker output
Power mode: dual power mode, the voltage drive and current power output level to separate power supply.
PCB size: 298.5x 93 mm
What's include?
XD 400W Mono LME49810+2SA1930/2SC5171 Class AB

Last edited by varun21; 2nd February 2016 at 08:15 AM.
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Old 2nd February 2016, 08:29 AM   #6
AndrewT is offline AndrewT  Scotland
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Why did you buy from a supplier that you know has no customer support?
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Old 2nd February 2016, 09:27 AM   #7
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They are on vacation due to Chinese spring festival. They are anyways not there to give tech support, only sales support. I bought it because that's the one I wanted. But it was impossible to figure out the psu connections from the pic.

Last edited by varun21; 2nd February 2016 at 09:31 AM.
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Old 4th February 2016, 04:06 AM   #8
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I see there are two or more +/-15V zener diodes connected to TL071. Is it possible they are use to convert from +/-60V to +/-15V? Because the current to LME49810 is very low, I guess there are using the same supply to power TL071. Those transistors and LEDs still make me curious.
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Old 4th February 2016, 04:09 AM   #9
rayma is offline rayma  United States
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Quote:
Originally Posted by varun21 View Post
Is it possible they are use to convert from +/-60V to +/-15V?
Yes, it's possible, and even likely. What resistors feed them?
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Old 4th February 2016, 04:49 AM   #10
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The Zeners on the either side of TL071 are going to GND/0V. I'm still trying to figure out the ones on the top left side.
Attached Images
File Type: jpg _DSC4925-as-Smart-Object-1-front.jpg (471.4 KB, 120 views)
File Type: jpg _DSC4925-as-Smart-Object-1.jpg (543.1 KB, 112 views)
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