LJM Audio

[ljm_ljm]

AC TO DC
MUR8100E * 4

63 V2200UF * 8

For reference.

 

[MrSlim]

ljm_ljm

Do you have a PSRR measurment for the L15D? I'm thinking about using a SMPS Power supply from Connexelectronics like the SMPS500QR..

 

[cOz]

My power supply outputs 56w would you recomend L15D or L20D?

 

[MrSlim]

56W or 56V.. if it's 56 Watts.. it won't do the job for either. I'm looking at 300 - 500 Watt SMPS for use with the L15D

If it's 56V, then the L15D is the choice, 55V is the recommended voltage in a 45-60v range
The L20D has a range of 60-80 with a recommended of 70V

 

[cOz]

oops it is 56V. Have some people not run the L20D at lower voltage with good results?

 

[MrSlim]

Not sure, there is a lower limit, below which the circuit stops working (oscillation stops?).
I did see something on one of the threads that suggested that some components could be adjusted to run at a somewhat lower voltage

 

[Jim McPherson]

ljm_ljm: I have a +/- 60v 500w SMPS power supply from Connexelectronics (very nice). Which amp would be better suited to fit the power supply: L-15D or L-20D?

-Jim

 

[ljm_ljm]

ljm_ljm: I have a +/- 60v 500w SMPS power supply from Connexelectronics (very nice). Which amp would be better suited to fit the power supply: L-15D or L-20D?

-Jim

+ -60V DC。

The voltage use L20D is very fit.

The use of voltage should not more than the highest voltage, this will not security.

 

[ljm_ljm]

ljm_ljm

Do you have a PSRR measurment for the L15D? I'm thinking about using a SMPS Power supply from Connexelectronics like the SMPS500QR..

You are going to use a switch power supply, switching power supply I used in the L15D, and L15DX2 above
(IRAUDAMP7S-150).

They are all very good work, and my client installed in the L15D car above. Use a
DC12 > +-50 V switching power supply.

As long as you change the voltage of power supply is less than 10 V +-basically do not have too big effect.

 

[dw1narso]

Hi ljm_ljm,

do you have any plan to produce lower wattage version with IRFI4024H-117P and IRFI4212H-117P output device? the version with IRFI4024H-117P would be interesting since it could be potentially powered with 2 x 12V SLA battery.

 

[ljm_ljm]

L15D can be directly used in DC +-25 V

But you need to change a few resistance. IRAUDAMP7S reference.

Do not need to change IRFI4024.

 

[MrSlim]

The reference document is IRAUDAMP7S reference


Page 37 shows the differences between the component values for various power supply voltages.

 

[dw1narso]

I see, so if I change the resistance in accordance to MrSlim pointing on page 37, I basically could turn down the power requirement (and gain as well?), while still using the IRFI4019 output device?

Do I need to change the zener and the clamping diode too?

 

[MrSlim]

To me, it looks like you'd have to change the Zeners(OVP and UVP) since they relate to the power supply voltage used, but the clamping diode looks like the same part number in all cases.

 

[dw1narso]

thanks Mr. Slim.

 

[MrSlim]

You're welcome, I learned something too..

 

[ljm_ljm]

IRFI4019 has higher VDS compression than IRFI4024.

And IRFI4020 also is such.


They can work in low voltage. But IRFI4024 may not work in high voltage.

 

[ljm_ljm]

L15D REV3 PWM Frequency I set it for 550 K HZ （default）

 

[Cyan]

I've noticed that the l25 version is available on ebay. Will you ever release the l10 with IRFI4212H? It could be the best choice of who is not fully satisfied with his t-amp power
Do these amps also support balanced connection?

 

[ljm_ljm]

I've noticed that the l25 version is available on ebay. Will you ever release the l10 with IRFI4212H? It could be the best choice of who is not fully satisfied with his t-amp power
Do these amps also support balanced connection?

Temporarily, I don't have IRFI4212H.

But, L15D can use lower voltage, modify the resistance data .