connexelectronic irs2092 kit

[wss1489]

I had a 'not good' experience purchaing irs2092kit with connexelectronic recently-2014 May. The core problem is that some parts are missing. Not match the parts discription of manual. And got a offensive reply to my compaining mail. No apology. I am so angry now but as foreign buyes, I can do 99% nothing.
Regardless the performance of the kit, I can't recommend deal with him.

 

[wss1489]

Nr

 

[Cristi]

email received sunday morning:
I received irs2092kit, but the kit part a somewhat inaccurate, and lack of pcs... for example there is 220nf 100v for c24. and there are only 3pcs 1nf 100v... Futhermore the marking in obscure.
HEY GUY, reply me. I have sent many mail to you about the item ... but you did no answer.
if you no reply about This case, I cannot but DO OPEN CASE...

my reply:
HEY !

1. make a list with all what you claim that is missing and I will refund the cost of those parts or send you again those parts.
2. what is obscure and what you don;t understand.
3. resend all the mails which you claim that I didn't answer.
4. open a dispute if you feel more comfortable and send all the parts back exactly as it was on your cost if you want a refund. but if you do that you'll be banned forever from purchase from us.

today is SUNDAY I hope you know

 

[Cristi]

one of the previous mails:
Hi
You have not answered to my question about the item I bought. Moreover any shipping information is not. Are you busy? But its your business.
I dont want the answer any more. So give a thing as ordered.

my reply:
Please calm down and tell me the order number soi can check. If you sent any email in the last 24-48 hours wait patiently and will get an answer. Today is monday, yesterday was sunday....

Yes I see. I think there are some problem in communications.
I just want know now when it will be shipped. The order number is 1599.
I plan to purchase several amplifier component from different seller and must control import tax. So for me the shipping information is very important.
I know people-the diyaudio members- are saying you are confident seller.
Sorry for my hesitant and poor eng.

--------tracking information---------

Thanks for your fast shipping and attachment document files.
But the resolution of the schematic jpg file is too low to recognize.
Would you please resent the jpg file as more large file?
Thanks.

--------resend the sch.--------



EOF.

 

[Cristi]

200W Kit BOM

IRS2092S KIT 200W version

Designator Value Footprint/Description Designator Value Footprint/Description
C1 10uF 25V Capacitor Cylinder 5mm R5 3K3 Resistor Axial 2W
C2 1nF 100V Capacitor Ceramic 2.54mm R6 100K Resistor Axial 0.25W
C3 100uF 10V Capacitor Cylinder 5mm R7 10K Resistor Axial 0.25W
C4 220pF 100V Capacitor Ceramic 2.54mm R8 2K4 Resistor Axial 0.25W
C5 470uF 100V Capacitor Cylinder 18mm R9 22R Resistor Axial 0.5W
C6 220n 63V Capacitor Radial 6x4mm R10 4R7 Resistor Axial 0.5W
C7 100n 63V Capacitor Radial 8x4mm R11 100K Resistor Axial 0.25W
C8 4700uF 50V Capacitor Cylinder 25mm R12 10K Resistor Axial 0.25W
C9 100nF 50V Capacitor Ceramic 2.54mm R13 27K Resistor Axial 0.25W
C10 33uF 25V Capacitor Cylinder 5mm R14 10K Resistor Axial 0.25W
C11 220pF 1KV Capacitor Ceramic 5mm R15 6K8 Resistor Axial 0.25W
C12 100nF 63V Capacitor Radial 200x100 R16 10K Resistor Axial 0.25W
C13 1nF 100V Capacitor Ceramic 2.54mm R17 10K Resistor Axial 0.25W
C14 100nF 50V Capacitor Ceramic 2.54mm R18 10R Resistor Axial 0.25W
C15 1nF 100V Capacitor Ceramic 2.54mm R19 5K6 Resistor Axial 0.25W
C16 100nF 50V Capacitor Ceramic 2.54mm R20 47K Resistor Axial 0.25W
C17 1nF 100V Capacitor Ceramic 2.54mm R21 10K Resistor Axial 0.25W
C18 220pF 1KV Capacitor Ceramic 5mm R22 10K Resistor Axial 0.25W
C19 100nF 63V Capacitor Radial 6x3mm R23 100R Resistor Axial 0.25W
C20 33uF 25V Capacitor Cylinder 5mm R24 2K2 Resistor Axial 0.25W
C21 100uF 10V Capacitor Cylinder 5mm R25 20R Resistor Axial 2W
C22 100nF 50V Capacitor Ceramic 2.54mm R26 10R Resistor Axial 0.25W
C23 1uF 100V Capacitor Radial 12x7mm R27 10R Resistor Axial 0.25W
C24 220nF 100V Capacitor Radial 12x7mm R28 4K7 Resistor Axial 0.25W
C25 33uF 25V Capacitor Cylinder 5mm R29 22K Resistor Axial 0.25W
C26 100nF 50V Capacitor Ceramic 2.54mm R30 4K7 Resistor Axial 1W
C27 220n 100V Capacitor Radial 6x4mm R31 510R Resistor Axial 0.25W
C28 4700uF 50V Capacitor Cylinder 25mm R32 10K Resistor Axial 0.25W
C29 33uF Capacitor Cylinder 5mm R33 4K7 Resistor Axial 0.25W
D1 SF14 1A 200V Fast Switching R34 10R Resistor Axial 0.25W
D2 SF14 1A 200V Fast Switching R35 10K Resistor Axial 0.25W
D3 SF14 1A 200V Fast Switching R36 6K8 Resistor Axial 0.25W
D4 SF14 1A 200V Fast Switching R37 470R Resistor Axial 2W
L1 22uH 25A TOR T106-2 VERTICAL R38 22R Resistor Axial 0.5W
Mute Red LED 3mm 10mA LED 3mm R39 4R7 Resistor Axial 0.5W
ON Blue LED 3mm 10mA LED 3mm R40 3K3 Resistor Axial 2W
Power 5 Pins 5mm Terminal Block 5x5mm R41 3K9 Resistor Axial 0.25W
Q1 IRF540 33A 100V 44mR MOS-FET R42 4K7 Resistor Axial 0.25W
Q2 2N3904 200mA 40V NPN Transistor Signal 3 Pin 2.54mm HDR 1X3 2.54mm
Q3 2N3904 200mA 40V NPN Transistor Th1 50K PTC Thermistor 50K
Q4 IRF540 33A 100V 44mR MOS-FET U1 IRS2092S Class D Amplifier Controller
Q5 2N3906 200mA 40V PNP Transistor Z1 5V6 0.5W Zenner Diode
Q6 22SC5171 2A 180V 20W NPN Trans Z2 15Z 0.5W Zenner Diode
R1 330R Resistor Axial 0.25W Z3 39Z 0.5W Zenner Diode
R2 3K3 Resistor Axial 0.25W Z4 39Z 0.5W Zenner Diode
R3 68K Resistor Axial 0.25W Z5 5V6 0.5W Zenner Diode
R4 510R Resistor Axial 0.25W Z6 13Z 0.5W Zenner Diode

 

[Cristi]

Quote from manual:

First, print the BOM corresponding to your amplifier kit power version, unpack the components and PCB, examine the parts and identify the parts based on their designator and values following the BOM. Make sure you have all the necessary components and try to not lose or damage any of them during assembly, as the amplifier will not work if something is missing or damaged. We double check the content before packing and shipping, and also weighing the components bag to make sure there isn’t weight difference between bags of components. Having ~100 components requires a lot of attention to have all of them packed dozen of times without missing something. In the unlikely event that something is indeed missing, contact us ASAP before attempting to replace the missing component with some wrong value which can damage the amplifier being built. Yet we shouldn’t be held responsible if any small component is missing (resistor, capacitor) especially if the parcel is opened at customs for inspection. A small resistor, diode or capacitor can be easily lost if the package is opened and inspected thoroughly.


Yep, he is right on the BOM are 4 pcs 1nF capacitors and seems that one could not be found. maybe I forgot to put it (everything was double checked so I doubt) maybe was lost if parcel was opened at customs or later....
this capacitor cost close to nothing, when I clean my worktable i sweep these parts into trash bin, so expensive they are. yet for some is a good reason to make troubles.
here we go back to post #17 fifth paragraph.

 

[Gustavus]

I think the important take away here is that communication is key. Unfortunately, that is easier said than done. The world may be round and separated by oceans, mountains, and even borders but for all intents and purposes the internet has made it flat. This means that lots of people who speak a variety of languages as their first language end up communicating.

If Cristi's first response was indeed the response that you received which you considered "offensive" let me say that as a native English speaker (which I'm guess neither you nor Cristi are) there was nothing offensive about it. It seemed straight forward and clear. Having the manual in hand, and product arriving today, there's nothing "obscure" that I can tell at all about this. The board schematic makes it all clear as day to me.

I really think that internet communication would be much better if we all tried to read things that others write at face value, and not assign our own assumptions of intent or emotion to them.

In any event, I plan on posting my own experience about building these modules here to give a representation of what the build is like based on someone with "novice" experience. Novice being that I have limited electronics and soldering skills, but that I do have proper soldering equipment (a decent temp controlled iron, proper tips, solder, and of course a carbon filter fan : -). And for reference, the most complex thing I ever built was an Elenco AM Radio Kit which is about 20 components - and is really just a project for kids.

 

[twest820]

I believe he had posted that questions should be asked at the Connex forum on his website for faster response.

That's been shut down. So I think it's read this thread and try to craft one's questions such that they end up in the ~50% of which do get answered (stat from post 17). I think a lot could be addressed with datasheets available pre-purchase, a FAQ, and submission guidelines in the contact form. But evidentially Christi's chosen not to go that way.

If you want I'd be happy to provide feedback and / or progress as I go.

If you can tell from the traces I'd be interested in knowing if it's pre or post filter feedback (combination is also possible).

 

[wss1489]

Ok my fault.

 

[doctordata]

If you can tell from the traces I'd be interested in knowing if it's pre or post filter feedback (combination is also possible).

Look at the schematics on the website , that's a pretty clear "pre" 😱
Amusing all those "demands" for a 16 dollar + some parts kit .😀
Cxd200 ,300 or 400 cost about the same , do the maths and enjoy a good amp !
Raving reviews on German forum . DIY-HIFI-Forum

Cheers ,

Rens

 

[Gustavus]

Cxd200 ,300 or 400 cost about the same , do the maths and enjoy a good amp !

I did the math before I purchased my kits - and I knew at the time, that the costs for the assembled modules probably made more sense than assembling myself, especially with the time required to do the work to assemble these. But that's hardly the point. 🙂 I wanted to put these together myself just for the satisfaction of having put these together myself...

On that note, I got my kits yesterday and started assembling the first board. The boards are smaller than I thought they would be. Everything was well packed. I didn't do a complete inventory check. But what I can say is that identical components are packed together. E.g. all of the 10k 1% 0.25w resistors (10 total per board in the kit I ordered) were packaged together, so that once I identified them - I had all in hand. The resistors were not marked with values - so I had to refer to the color chart. Other than that, it's looking pretty straight forward.

 

[twest820]

Look at the schematics on the website , that's a pretty clear "pre"

That's a good point; likely safe to assume the two blobs after the inductor are clamp diodes.

 

[Gustavus]

Build Update

I've started my build - limited time until the network so I only got (most of) the 0.25watt resistors installed. This weekend I should be able to finish the first board and provide better impressions.

An externally hosted image should be here but it was not working when we last tested it.

 

[Gustavus]

Build Complete

I've completed building my first module. I should have time tomorrow to test it and see if I made any mistakes. ;-)

An externally hosted image should be here but it was not working when we last tested it.

 

[goocher89]

lookin good, keep us updated!

 

[goocher89]

Figured id ask here instead of starting a new thread...are discrete class d amps better/more economical than irs2092 ones?

Are there any good ucd based kits/pcbs available? Hypex is too expensive for me unfortunately.

 

[Bare]

Save up !?? You won't regret it.. later.

 

[goocher89]

Its not just price, id prefer a kit i need to solder together myself. I like that

 

[goocher89]

Another question, what about the truepath from 41hz? Is it still worth getting, i heard most tripath chips are fakes nowadays...

 

[irribeo]

Well does 41hz exist? I guess the answer should be no.