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Class D Switching Power Amplifiers and Power D/A conversion

200W IRS2092 Amp for
200W IRS2092 Amp for
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Old 13th August 2019, 05:15 AM   #501
sozkarabacak is offline sozkarabacak  Turkey
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CLASS-D 800W AMPLIFIER MOSFET - Share Project - PCBWay
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Old 13th August 2019, 05:17 AM   #502
abraxalito is offline abraxalito  United Kingdom
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Yes, I am going to mention those when I get around to finishing the list of mods. I'm using 2200uF/6.3V across the zeners and also at the output of the EFs. They happen to be about the physically largest which will fit in the space available. I have tried adding more uF (in parallel on the bottom side) but can't hear any improvement, even with ~7000uF or so. So I reckon 2200uF is about as good as it gets.
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Old 13th August 2019, 12:24 PM   #503
abraxalito is offline abraxalito  United Kingdom
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Default Mods list, continued

Input circuitry mods (powered through pins 1 & 6) :

i) Reduce the zener diodes to 5.6V (Z103,Z104). This reduces the quiescent current, no downside that I've found so far.
j) Increase the rail and zener decouplers to 2200uF/6.3V. I used NCC KZJ (8mm dia) but I doubt the particular model is highly critical.
k) Decrease the zener biassing resistors to 6k8 (use 1206)
l) Add an X7R cap between pin1 and pin6 as recommended in the appnote. These pins power some CMOS logic as well as the OTA so need a close-in HF current path (AN-1138, p17)
m) Adjust R11 to give an idle switching frequency of ~400kHz. I found I need something between 300-330R (249R is fitted) due to the changes in low side drive voltage, dead time and gate resistors.
n) Remove C2 (input RF filter) as I already have an output filter on my DAC.
o) Remove CP1 if your DAC/pre output is already AC coupled. Its an unbiassed polar electrolytic so you're better off without that, SQ-wise.
p) Re-use the CP1 pads for a series resistor to give the appropriate gain for your system - in many cases having 31dB gain is too much, feel free to reduce it by ~6dB by adding a 3k3 in place of CP1.
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Old 3rd September 2019, 12:36 AM   #504
troystg is offline troystg  United States
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Take 2... Lets see if these work this time.

20 Ohm load resistors on the binding posts.P_20190902_183352.jpgP_20190902_183407.jpg1567467394648.jpg
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Old 3rd September 2019, 06:31 PM   #505
troystg is offline troystg  United States
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NO JOY... Finished the amp connected it to my test speakers and let it play. It played fine for over an hour. Then POP and an increasing "saw type" sound. I ran over and turned it off.

I will NEVER trust these modules on anything other than shop speakers.
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Old 4th September 2019, 12:00 AM   #506
Peterma is offline Peterma  Australia
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Speaker protection is a must for these buggers, and the other problem is that Chinese parts can be unreliable and overrated.
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Old 4th September 2019, 05:55 AM   #507
redjr is online now redjr  United States
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200W IRS2092 Amp for
Quote:
Originally Posted by Peterma View Post
Speaker protection is a must for these buggers, and the other problem is that Chinese parts can be unreliable and overrated.
It seems these little guys are fun to mess with, but really not ready for prime-time some of the time. Especially when 'real' speakers are involved. I vote for a more costly solution using an ICEPower module like this. Since the PSU is onboard, you only need to add an enclosure and I/O connectors. Sounds equally as good(if not better) than the IRS modules (I have those too). All protection aspects are built-in as well. Great little module from a reliable company(B & O).

I recently built a small amp using this module and it sounds great and works as expected and reliably. A few years back I also built another class D amp using a higher wattage output ICEPower module. I've been very happy with their sound and performance.

I know it's more money, but for the peace of mind......
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Old 4th September 2019, 06:09 AM   #508
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by redjr View Post
It seems these little guys are fun to mess with, but really not ready for prime-time some of the time. Especially when 'real' speakers are involved.
I agree, given the price disparity between the amp and speakers, some kind of fail-safe protection is mandatory.

Quote:
I vote for a more costly solution using an ICEPower module like this. Since the PSU is onboard, you only need to add an enclosure and I/O connectors. Sounds equally as good(if not better) than the IRS modules (I have those too).
I have one of those supplied in a box from Taobao, price was 880RMB. Sounds better than a typical IRS2092 module stock to my ears (more dynamic). However with the power supply tweaks, the IRS2092 climbs ahead, (the dynamics become about the same) primarily on HF cleanliness. To my ears the HF of the IcePower sounds a bit 'op-amp-y'. And since pretty much all the active circuitry is on their custom IC there isn't any option to tweak.
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Old 4th September 2019, 03:09 PM   #509
DarpMalone is offline DarpMalone  Canada
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Quote:
Originally Posted by Peterma View Post
Speaker protection is a must for these buggers, and the other problem is that Chinese parts can be unreliable and overrated.
I'd argue that speaker protection is a must with any amplifier, regardless the price or manufacturer.
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Old 4th September 2019, 03:29 PM   #510
troystg is offline troystg  United States
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Quote:
Originally Posted by redjr View Post
....I vote for a more costly solution using an ICEPower module like this. .........

I know it's more money, but for the peace of mind......
I need a tad bit more power then those. Was considering the 125x2ASP(?) I need at least 50x4 into 8 Ohms for the mids and ribbons. The woofers will have ~200x2 into 8Ohms.

But I think I will give my 4x Twisted Pear Mauro My_Ref a go and see if they can cut it. The mid section is a mild 6 Ohms so roughly about 40-50 watts.
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