Thanks for the quick response!
I'm curious: What is the comment? The RDSON is very lower the "Switch Power Mosfet" and IDS Current also. But Ciss and QG However is very higher.
Why is not here apply these? Efficiency is higher, pay is less!
What is the secret "Audio Power Mosfet"?
I don't want to is not unto you the misunderstanding! I want to know and I'd like to understand: Why not be replaced?? If there is a logical explanation...
Thank You!
I'm curious: What is the comment? The RDSON is very lower the "Switch Power Mosfet" and IDS Current also. But Ciss and QG However is very higher.
Why is not here apply these? Efficiency is higher, pay is less!
What is the secret "Audio Power Mosfet"?
I don't want to is not unto you the misunderstanding! I want to know and I'd like to understand: Why not be replaced?? If there is a logical explanation...
Thank You!
D
Deleted member 148505
To bad I already bought the L25D from zoe tsang, should have bought the L15D instead.
What resistor values should be changed in order to run my L25D with 38-0-38VAC (53VDC)? And what would be the output power at 4 ohms?
Thanks
Last edited by a moderator:
See page 37 of the reference document that I posted a link to in post 299 of this thread. It lists the differences between the various versions suggested by International Rectifier. Since the L25D is actually a higher rated design (above the L20D), its not on the list (strictly ljm_ljm's design). You will have to reverse engineer the board to the schematic to determine which resistors to change, since non of the LXXD boards I've seen (photos or physically) don't have any component names associated with the parts.
It's a simple design though so it should be reasonably easy to figure out. (you could use the L15D board layout to identify the actual values in the table, as long as they remained the same)
At 53VDC you should get 250W @ 4 Ohms with a L15D..
Last edited:
Yes, you will need one.
Look at post 217 or just use the search function, this question was already discussed here.
Correct me if I'm wrong, L15D is using IRFI4019H-117P.
Active cooling is highly recommended to reach 250W @ 4 Ohm.
Finished Amp Pictures
With so much discussion going on on this forum, many of you must have finished the amp by now. Please post more pictures of your finished amp, I'll post some of mine to start with.
Amp modules: L20d
SMPS: Connexelectronic SMPS800R (2 x 60V dc)
Speaker Protection: Connexelectronic, powered by Aux 12Vdc of the SMPS
Chassis: Galaxy 230x280/80 with 10mm front (and alu covers)
Maarten
With so much discussion going on on this forum, many of you must have finished the amp by now. Please post more pictures of your finished amp, I'll post some of mine to start with.
Amp modules: L20d
SMPS: Connexelectronic SMPS800R (2 x 60V dc)
Speaker Protection: Connexelectronic, powered by Aux 12Vdc of the SMPS
Chassis: Galaxy 230x280/80 with 10mm front (and alu covers)
Maarten
Last edited:
Good morning everyone.
Here is my amplifier based on the IR IRAUDAMP7s.
Already tested and approved.
Good mount everyone.
luizcpimenta@yahoo.com.br
Please check the attached file (iraudamp7s). All development of this project was based on it.
The voltages of my project is +-35V to +-45V.
If you want I can send the files generated by PCAD.
Good luck in the assembly.
Luiz C. pepper
luizcpimenta@yahoo.com.br
Finaly somebody who doens't care about all those Giagawatts !
I'm running my L15D's at +/- 50 volts , so that's about 125 clean watts at 8 ohms .
I read here all the time about L20D's , L25D's and all their watts , what's the point . it's less ore just 3dB above the L15D and set you wallet back in Power supplies and other stuff ,so it won't sound any louder !
What am I missing here ?
Cheers ,
Rens
I'm running my L15D's at +/- 50 volts , so that's about 125 clean watts at 8 ohms .
I read here all the time about L20D's , L25D's and all their watts , what's the point . it's less ore just 3dB above the L15D and set you wallet back in Power supplies and other stuff ,so it won't sound any louder !
What am I missing here ?
Cheers ,
Rens
is'nt this true with the next 3 dB ? and the next, etc.Sometimes, when you at max volume, and need a tad louder - these 3db will make you smile
Upgrade
Good morning everyone!
See the attached files, they demonstrate how to change the resistors marked with "*" as a function of power and supply chosen.
Good luck to all.
Luiz C. Pimenta
Good morning everyone!
See the attached files, they demonstrate how to change the resistors marked with "*" as a function of power and supply chosen.
Good luck to all.
Luiz C. Pimenta
I am fascinated by the new IR chipset, but have no immediate need for all that power. Just how good do these designs SOUND?!!? Are they as good as the Tripath designs? These have been around since 2006 and should be debugged by now.
Clearly these are not for beginners. 60-70V power at the required current (>3A) is potentially people frying juice. At that, however, these are no more dangerous than the high power chip amps, some of which run at +/- 70VDC, and are also not for newbies.
As far as 'who needs all those watts' goes, a very large listening room (or a pro performance setup) can soak up a whole lot of amp power, especially for those who wish to blow out their auditory apparatus with row A experiences. Some of the new (and interesting) time aligned infinite baffle designs can eat up all the ampli's you can fry, and then some.
Clearly these are not for beginners. 60-70V power at the required current (>3A) is potentially people frying juice. At that, however, these are no more dangerous than the high power chip amps, some of which run at +/- 70VDC, and are also not for newbies.
As far as 'who needs all those watts' goes, a very large listening room (or a pro performance setup) can soak up a whole lot of amp power, especially for those who wish to blow out their auditory apparatus with row A experiences. Some of the new (and interesting) time aligned infinite baffle designs can eat up all the ampli's you can fry, and then some.
Just for reference 0.002-0.004 amps can stop your heart cold or cause severe heart problems. In reality that is directly across the heart, it takes more amperage to get to the heart through the tissue.
I am super pumped about a IRS2092 setup for some reason. I have been posting about it and plan on a multichannel setup. I am still collecting info and trying to decide who's kit.
My setup is purely home theatre with minimal stereo listening. I have 8 full range speakers, with a total of 20 drivers in total in my 13' x 45' basement theatre setup and would love to drive them to their rating with clean, low THD, high efficiency power. It seems too good to be true... I would love to smoke a voice coil with this setup, instead of stressing out my antique onkyo reciever which can barely pump out 90x2 rms and probably 30x5rms (per the nameplate)
I think the dynamic peaks with such a large amplifier would be insane, can you say explosions in a movie? or gun shots? or even better yet some norah jones, or adele screaming at the top of her lungs?
This thread is way off topic on page 32 - but oh well - flame on
I still think LJM's L25d and hien.t.nguyen's L25de is pretty cool, I just need to decide which to use. either way +/-70V and 250W is calling to me
I am super pumped about a IRS2092 setup for some reason. I have been posting about it and plan on a multichannel setup. I am still collecting info and trying to decide who's kit.
My setup is purely home theatre with minimal stereo listening. I have 8 full range speakers, with a total of 20 drivers in total in my 13' x 45' basement theatre setup and would love to drive them to their rating with clean, low THD, high efficiency power. It seems too good to be true... I would love to smoke a voice coil with this setup, instead of stressing out my antique onkyo reciever which can barely pump out 90x2 rms and probably 30x5rms (per the nameplate)
I think the dynamic peaks with such a large amplifier would be insane, can you say explosions in a movie? or gun shots? or even better yet some norah jones, or adele screaming at the top of her lungs?
This thread is way off topic on page 32 - but oh well - flame on
I still think LJM's L25d and hien.t.nguyen's L25de is pretty cool, I just need to decide which to use. either way +/-70V and 250W is calling to me
Last edited:
Have a look here
http://www.diyaudio.com/forums/clas...tests-hifimediy-t2-ljm-l20d-sure-tda7498.html
Yes, DIY is dangerous and everyone should be aware that dealing with electricity can end up deadly. So be careful.
On the ESP pages I've found some good explanations and some practical advices.
Electrocution
D
Deleted member 148505
Hi!
Received my L25D kit, but I only have +-53VDC supply. Just to verify, can I replace those resistors specified in page37 of iraudamp7s datasheet to be able to run the AMP7S-200 like AMP7S-150? Can I achieve 250W at 4ohms with 53VDC without replacing IRFB4020 with IRFI4019? (With active cooling)
Thanks
The IRS2092 and 15V diode is presoldered on the board
Thick PCB =)
Received my L25D kit, but I only have +-53VDC supply. Just to verify, can I replace those resistors specified in page37 of iraudamp7s datasheet to be able to run the AMP7S-200 like AMP7S-150? Can I achieve 250W at 4ohms with 53VDC without replacing IRFB4020 with IRFI4019? (With active cooling)
Thanks
The IRS2092 and 15V diode is presoldered on the board
Thick PCB =)
Last edited by a moderator: