hello, im trying to build a relatively low cost amplifier for my 500w 4ohm subwoofer. so far Ive managed to get everything working (playing relatively loud & clear) however I would love some clarification on a few things.
A) I don't know if I'm correct, but I believe I need to isolate the power going to each SMPS, at the moment i have one SMPS connected to a socket in my room, and the other SMPS is connected to a different socket. i measured the resistance between each of the 12v outputs on the SMPS and it was over 2 Mohm so this is a good way of isolating them, however would having them both on the same AC line work? maybe they have some sort of isolation built in...
Here's the SMPS product link: here
B) I have seen quite a lot of videos that say these little step-ups cannot reach 500w ( playing loud for a while), is this true? they use TL494. Also lets say the IRS2092 draws 500w. would this be split between the two step-ups (250w drawing from each)? if so then i imagine they would be alright, I've never really seen "negative" voltage before so its kind of new to me the idea that ground is just a reference etc. step-up (it is 60v idk why it says 50v)
C)Note that i have added much larger heatsinks and fan cooling to all the parts. Is it possible that the IRS2092S could reach 500w at 4ohms? I am certain i have a legitimate IS2092 amp as it has the chip heatsink, proper mosfets and other signs.
Any other tips would really be appreciated, I'm on a bit of a tight budget and don't want to break what i already have, while still getting some nice performance.
irs2092s: here
A) I don't know if I'm correct, but I believe I need to isolate the power going to each SMPS, at the moment i have one SMPS connected to a socket in my room, and the other SMPS is connected to a different socket. i measured the resistance between each of the 12v outputs on the SMPS and it was over 2 Mohm so this is a good way of isolating them, however would having them both on the same AC line work? maybe they have some sort of isolation built in...
Here's the SMPS product link: here
B) I have seen quite a lot of videos that say these little step-ups cannot reach 500w ( playing loud for a while), is this true? they use TL494. Also lets say the IRS2092 draws 500w. would this be split between the two step-ups (250w drawing from each)? if so then i imagine they would be alright, I've never really seen "negative" voltage before so its kind of new to me the idea that ground is just a reference etc. step-up (it is 60v idk why it says 50v)
C)Note that i have added much larger heatsinks and fan cooling to all the parts. Is it possible that the IRS2092S could reach 500w at 4ohms? I am certain i have a legitimate IS2092 amp as it has the chip heatsink, proper mosfets and other signs.
Any other tips would really be appreciated, I'm on a bit of a tight budget and don't want to break what i already have, while still getting some nice performance.
irs2092s: here
You should get about 450WRMS into 4 ohms speaker.
I would use a single mains socket rather than 2.
Powering up same circuit but not simultaneously can sometimes cause problems.
With SMPS sometimes they connect zero volts to earth which means you cant put the outputs of 2 SMPS in series.
If what you have works then they cant be connected to earth.
I would use a single mains socket rather than 2.
Powering up same circuit but not simultaneously can sometimes cause problems.
With SMPS sometimes they connect zero volts to earth which means you cant put the outputs of 2 SMPS in series.
If what you have works then they cant be connected to earth.
Thanks for the quick reply. Just did a continuity test and the Ground(ac in) is isolated from the -ve output on mine. Definately sure that the supplies dont have to be isolated from eachover and can use one AC?
