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Class D Switching Power Amplifiers and Power D/A conversion

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Old 11th March 2013, 01:00 AM   #641
redjr is offline redjr  United States
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Location: Danbury, CT
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Originally Posted by Tekko View Post
I also had problems with the SURE IRS2092 amp, if not fored air cooled with a fan, it quickly heats up to 90+ deg C, and after about 30 minutes it starts making clicking noises likethere was a shutoff starting to oscillate on/off, also the stock inductors got smoking hot and stunk out my livingroom.

I contacted SURE about this, they were unable to reproduce the issues and claimed to only have one single other report of similar issues, and promised to send me another amp free of charge, but they never did.

This SURE amp will most likely become a parts donor for other projects as it feels wrong to have to fan cool a class D amp whose heatsink is more than big enough for stated power rating, if i have to do that i could just as well use a class AB amp.
My Sure based IRS2092 amp would work for about an hour. Then the right channel would cut out, the volume would lower and a loud hum would commence. I had read on another 2092 thread that Sure doesn't seem to adjust these at the factory, so that's probably why mine would heat up mercilessly too. Way too hot for Class D I thought - and I had it in a well-vented enclosure. I'm just going to cut my loses and probably not by Sure anymore. There are other, better modules out there. I haven't received the new 2092 module from Cristi yet at Connexelectronic, but his SMPS modules and speaker protection boards are first rate. I'm sure I can expect the same from him with this amp.

My next project will be based on this module.

Rick
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Old 11th March 2013, 01:23 AM   #642
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Originally Posted by redjr View Post
Hi Rod,

Actually, this is the TK2050 module from HiFimeDIY I have. It's been on my bench, wired up and tested, but hasn't found a permanent enclosure, or home yet. Thinking about making a little iPod amp for my daughter with it. Can't beat the price. See attached image below.

Rick
Thanks Rick. Actually I have his T4 amp sitting and not built up yet. When I finally go active on our 3 front 104 db efficient speakers I'm going to need more amps. So trying to get a feel for which way to go.

Cheers,
Rod
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Old 11th March 2013, 05:44 PM   #643
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Sure Electronics actually spec the IRS2092 based amp to 90deg C nominal operating temperature which to me seem really wrong.
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Old 12th March 2013, 06:37 AM   #644
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Great info, thanks.

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Originally Posted by Volvotreter View Post
Hi,
with a cordless screwdriver you can easily twist the pairs.
Keeping the wires under tension while twisting makes them become straight.
Then it's just a matter of cutting and bending with some long nosed pliers.
For sure some ambition and patience is also required.

Erik
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Old 12th March 2013, 06:39 AM   #645
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Originally Posted by redjr View Post
LJM IRS2092 - My favorite.

My other favorite - although not DIY - is my Pioneer SC-05 used in my HT rig which uses the B&O ICEPower amp module. Simply the sweetest and silky smooth sound I've ever heard.
Hmm, sounds like the SC-05 is more favorite than the IRS2092
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Old 12th March 2013, 01:12 PM   #646
redjr is offline redjr  United States
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Originally Posted by noah katz View Post
Hmm, sounds like the SC-05 is more favorite than the IRS2092
Since it's in my HT, the SC-05 probably gets more use - at least for movies. But even for 2-channel it is very sweet sounding indeed. I'm sure it's not the ICEPower modules alone that works the magic, but other things Pioneer has done on the inside to optimize the sound as well. When I haven't fired up my vintage rig, the LJM amp is the one normally on for general CD listening.

Rick
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Old 13th March 2013, 01:03 AM   #647
redjr is offline redjr  United States
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Originally Posted by nwboater View Post
Thanks Rick. Actually I have his T4 amp sitting and not built up yet. When I finally go active on our 3 front 104 db efficient speakers I'm going to need more amps. So trying to get a feel for which way to go.

Cheers,
Rod
Yeah they have some interesting audio stuff on that site. DACs, digital-amp(DDX320), and other neat stuff. Now you've got me curious about the T4. Powerful little module. I like the fact that it can take both dual, or single voltages. What PSU are you going to use with it? A conventional, dual-polarity linear one, or single SMPS? My credit card suffers when I start looking!

Rick
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Old 13th March 2013, 01:29 AM   #648
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Originally Posted by redjr View Post
Yeah they have some interesting audio stuff on that site. DACs, digital-amp(DDX320), and other neat stuff. Now you've got me curious about the T4. Powerful little module. I like the fact that it can take both dual, or single voltages. What PSU are you going to use with it? A conventional, dual-polarity linear one, or single SMPS? My credit card suffers when I start looking!

Rick
Hi Rick,

I got the Connexelectronic.com smps300R supply Connexelectronic The amp is really over powered for my Klipsch Heritage stuff but it's the one that HiFiMeDIY suggested for my speakers. My only concern with such high efficiency speakers is the amps noise level. Sure hope it's not a problem. Will probably be awhile before I do the build.

Yea those credit cards are dangerous little things!

Cheers,
Rod
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Old 14th March 2013, 01:15 PM   #649
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This is my own version of IRS900, enjoy, it's working perfectly!

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Old 14th March 2013, 02:18 PM   #650
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