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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th February 2012, 04:12 PM   #321
alkasar is offline alkasar  France
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received mine. Nice boards indeed. Chip, two 15V diodes and one resistor presoldered. Like yours. Wonder why these through hole components come presoldered.... nevermind

According to my undesrtanding and to what ljm said earlier, an L25D with two 4020 is better suited to deliver power in 4ohms than a L15D with only one 4019.

I'll run mine at 60V. Will see how much power I can get out of them in 4ohms.

I am in the process of bying upgrade parts where appropriate.
- low esr filtering caps
- input 22u caps : nichicon muse or elna silmicII with a bypass capacitor

any other parts which could need an upgrade ?
thanks
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Old 29th February 2012, 11:05 PM   #322
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By the way, it is the easiest kit i ever soldered - all the component values are on PCB, you don't need to cross-check with BOM, and all these parts have largish PCB pads - easiest soldering ever.

Thanks LJM!
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Old 1st March 2012, 01:38 AM   #323
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Quote:
Originally Posted by alkasar View Post
According to my undesrtanding and to what ljm said earlier, an L25D with two 4020 is better suited to deliver power in 4ohms than a L15D with only one 4019.

thanks
I see.. I also compared the datasheet of IRFI4019H and IRFB4020PBF, IRFB4020PBF definitely has better specs.
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Old 1st March 2012, 09:28 PM   #324
alkasar is offline alkasar  France
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The L25D kit comes with 6 x 22uF electrolytic capacitors per amplifier, rated 100V.

In the IRAUDAMP7S reference design BOM, the 22uF capacitors are rated 25V

Can I trust the BOM and use 25V rated 22uF capacitors ?
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Old 2nd March 2012, 01:19 AM   #325
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Quote:
Originally Posted by alkasar View Post
The L25D kit comes with 6 x 22uF electrolytic capacitors per amplifier, rated 100V.

In the IRAUDAMP7S reference design BOM, the 22uF capacitors are rated 25V

Can I trust the BOM and use 25V rated 22uF capacitors ?
You can use higher voltage rating for capacitors

http://www.learningaboutelectronics....capacitor-mean

Last edited by jlester87; 2nd March 2012 at 01:29 AM.
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Old 2nd March 2012, 07:04 AM   #326
alkasar is offline alkasar  France
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Quote:
Originally Posted by jlester87 View Post
You can use higher voltage rating for capacitors

What does the Voltage Rating on a Capacitor Mean?
Of course higher rating is not a problem.
My question is about replacement of the kit 100V capacitors by better caps, 25V rated these are easier to find.
I'd like to use panasonic FC caps.
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Old 2nd March 2012, 11:41 PM   #327
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Hi Maarten
Wow it looks awsome! I wanna bould one exactly like yours. I have looked around the net, but cant find the chassis - will you link to it?
I am also a little bit confused about witch powersupply u use - and why so large 800? Is it this one; Connexelectronic
What is the price in total?
Thanks in advance

Ps. can u make a higher resolution photo of the inside.?

Quote:
Originally Posted by platenspeler View Post
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

Click the image to open in full size.

Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.
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Old 3rd March 2012, 07:31 PM   #328
Jolojl is offline Jolojl  Sweden
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Hi!

I have two questions about The IRAUDAMP7.

1) The IRAUDAMP7 data sheet (http://www.irf.com/technical-info/re...iraudamp7d.pdf) mentions various AMP7D implementations, including one AMP7D-55 running on 25V. Is this just a matter of supplied voltage (i.e. can one run any of the AMP7D kits available on for instance 30V) or does this require a specific implementation?

2) What is the input impedance of the AMP7D? In the data sheet there is this phrase in the Input Signal and Gain Setting section that says "A proper input signal is an analog signal ranging from 20Hz to 20kHz with up to 3 VRMS amplitude with a source impedance of no more than 600 Ω.". This seems to imply a quite low input impedance (probably not more than 6K ...), does anybody know for sure?

Best!
Johan
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Old 3rd March 2012, 08:09 PM   #329
MrSlim is offline MrSlim  Canada
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Quote:
Originally Posted by alkasar View Post
Of course higher rating is not a problem.
My question is about replacement of the kit 100V capacitors by better caps, 25V rated these are easier to find.
I'd like to use panasonic FC caps.
If IR is suggesting 25V caps in their design, then you should be fine. It would be nice if you could build them with the supplied caps, get used to the sound and then make the cap changes, so you can see if you can identify an improvement.. (or even do one channel first and do some mono testing..) and report back to us.. ;=
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Old 4th March 2012, 12:01 AM   #330
cwier60 is offline cwier60  United States
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Quote:
Originally Posted by Jolojl View Post
1) The IRAUDAMP7 data sheet (http://www.irf.com/technical-info/re...iraudamp7d.pdf) mentions various AMP7D implementations, including one AMP7D-55 running on 25V. Is this just a matter of supplied voltage (i.e. can one run any of the AMP7D kits available on for instance 30V) or does this require a specific implementation?
There's no problem running any of the higher power implementations at lower supply voltages and thus lower maximum output power, unless the undervoltage points have been set above this supply voltage. Sorry, but I haven't checked whether that is the case.
Quote:
2) What is the input impedance of the AMP7D?
Looks like it's 3.3K, which is pretty low. It's R2 + R7. This gives a high-pass DC block at 2.2 Hz with the 22uF CP1.
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