IRS2092 (IRAUDAMP7S) + IRFI4019

[pet007]

Hi, right now I'm testing L15D amp, I have to say, it sounds very good at low volume levels, I am satisfied
Anyway the output inductor is quite hot, is it normal ? My idle current consumption are -50mA and +30mA (+/-55V). I have L15D kit (and all components) from eBay zoe_tsang shop. Inductor is square type OFC? 14A / 0.012Ohm. Thanks.

[ljm_ljm]

Inductor is will have some fever. Especially in under the condition of no sound output.

PWM 400 k close to power supply voltage (+ - 50 V) signal continued through the inductor, reduce to 0.5 V.

But we can ignore it.

[daol]

Hello, I bought to Along1986 the kit L15D ver3 last year (two boards) and I have the same problem with the two boards: the positive supply voltage rises gradually from +52 to +72 volts vots and negative supply down from - 52 volts to -38 volts, thereby raising the temperature of the resistance of 3K3 which feeds the zener 5V6 on positive supply.
I built the two boards and I guess I made a mistake when placing components, LJM, can you send me the schematic and component mask? can it happen by self oscillation?

Test condition:
Power supply: +/-52 volts, linear
Input: no signal, open.
Output: 10 ohms load and without load.
Blue Led: ON
Signal at output: ~400Khz, 400 mV p-p


Sorry for my bad English.


Regards,


Daniel.

[nigelwright7557]

Originally Posted by daol

Hello, I bought the kit to Along1986 L15D ver3 last year (two boards) and I have the same problem with the two boards: the positive supply voltage rises gradually from +52 to +72 volts vots and negative supply down from - 52 volts to -38 volts, thereby raising the temperature of the resistance of 3K3 which feeds the zener 5V6 on positive supply.

Daniel.

This sounds like bus pumping. It is most prone when applying a sine wave especially low frequency.
When inputting normal music it should be fine.

[doctordata]

Originally Posted by daol

the positive supply voltage rises gradually from +52 to +72 volts vots and negative supply down from - 52 volts to -38 volts,

Daniel.

Looks like a PSU problem to me , no signal no buspumping .
check your transformer centertap to ground connection .

Cheers ,
Rens

[daol]

Doctordata,

Thanks you, it was a bad transformer centertap to ground connection.


Regards,


Daniel.

[ostenax]

Hello,

I have a question to L15D-Pro modules. I read that the L15D modules works best with higher voltage (as near to 60V as possble). But for the L15D-Pro their is a recomendation to use max 50V. Is this because of the protection unit? And is it possible to drive the protectet module with 60V either? Or are there other reasons why the L15D-Pro can only work with max. 50Volts?

Regards Axel

[DcibeL]

Hi ljm,
I have purchased and assembled 5-channel surround amplifier using your L15D-Pro modules. They were easy to assemble and all work just great! However, I guess I did not buy from the right eBay seller? I used Happyshop1982. My boards look just as advertised, except for output filter cap is a Carli instead of Tenta, and power supply buffer caps are Nichicon PW series. I checked all parts out thoroughly, all checked ok.

I am driving with 54V rails. Sound is excellent, the amp I swapped out for comparison was an old Harman Kardon HK6900, rated 170W/ch. The L15D sound is more revealing I find, however a bit more tizzy on the very high end where the HK had a very smooth high end. On the other hand, the HK is making at least 100W of heat before any sound reaches your ear, the L15D is a fraction of that, and modules did not appear any warmer then at idle after playing loudly.

Anyway, just wanted to say thanks for the great amplifier modules, they are great.

[ljm_ljm]

Originally Posted by ostenax

Hello,

I have a question to L15D-Pro modules. I read that the L15D modules works best with higher voltage (as near to 60V as possble). But for the L15D-Pro their is a recomendation to use max 50V. Is this because of the protection unit? And is it possible to drive the protectet module with 60V either? Or are there other reasons why the L15D-Pro can only work with max. 50Volts?

Regards Axel

This is because the protection module. Relay for rated coil voltage 48 v. Not more than 55 v + - recommended voltage.

60 v can be used, should be in the relay power supply in series a resistor? The resistance of the relay is about 6.3 K
Then the series of resistance around 1.2K 0.25/W