M400 diy kit with 2SK1058/J162 chip - diyAudio
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Old 21st November 2013, 08:56 PM   #1
lamir35 is offline lamir35  Israel
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Default M400 diy kit with 2SK1058/J162 chip

Hi, I'm interested in a build for my speakers. I need 100W into 4ohms. Will this M400 amp be a good choice and good value at $125? Which PSU is recommended? Thank you for any help.
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Old 22nd November 2013, 01:37 PM   #2
TonyCH is offline TonyCH  Finland
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I ordered 2 of those couple of weeks ago so I too am interested in any PSU suggestions.

Lamir, I read some positive comments on the kits on this forum prior to ordering.
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Old 3rd December 2013, 03:27 PM   #3
lamir35 is offline lamir35  Israel
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Shameless self bump. Does it only take a +/-30 transformer or will I need some sort of regulator circuit? It comes with no schematic and I need to know which transformer I should get for it to get 100W into 4ohm out of it. Thanks for any comment.

Last edited by lamir35; 3rd December 2013 at 03:36 PM.
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Old 3rd December 2013, 04:13 PM   #4
TonyCH is offline TonyCH  Finland
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Sent a private message to you replying your questions.

When you find the small heat sinks which do fit the PCB nicely please let me know.

Sorry, don't know about 4ohms. HDAmps said this:
Quote:
As a general guide you can select transformer from +- 35vdc (producing 70 wrms/8 ohms) to +-58v (135 wrms/8ohms) 3amp per channel.

Last edited by TonyCH; 3rd December 2013 at 04:27 PM.
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Old 3rd December 2013, 05:03 PM   #5
burbeck is offline burbeck  United Kingdom
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hi Lamir
have you got a schematic for this amp? this type of amp usually runs on +/-50 Volt supplies, pointing to a 35 0 35 Volt RMS secondary for the transformer. @500VA
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Old 3rd December 2013, 05:12 PM   #6
TonyCH is offline TonyCH  Finland
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Quote:
Originally Posted by burbeck View Post
hi Lamir
have you got a schematic for this amp? this type of amp usually runs on +/-50 Volt supplies, pointing to a 35 0 35 Volt RMS secondary for the transformer. @500VA
Didn't Lamir just post that it came with no schematic?

And I thought I just posted what the manufacturer recommend for transformer?

But, it cames with no paper documentation. Manufacturer emails a text only instruction manual for assembly and testing. No schematic at all. He does reply to emails in one or two days though.

Last edited by TonyCH; 3rd December 2013 at 05:16 PM.
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Old 3rd December 2013, 05:55 PM   #7
lamir35 is offline lamir35  Israel
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Will the 22570 (2 x 35 V, 3.21A) do the job? One of the outputs is -, right?
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Old 3rd December 2013, 06:50 PM   #8
TonyCH is offline TonyCH  Finland
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lanchile built M400 before, ask him for his transformer specs. And please post them here.

Also hcbonfim built one with 2 transformers.

This is interesting amp but I find the documentation a bit lacking so its not the easiest to start with.

I was thinking building it dual mono and going with twin 2x45V 2.25A 220VA toroidal transformers and the outputs connected in parallel giving 4.5A. But, my investigation continues. Any suggestions are welcome.

Last edited by TonyCH; 3rd December 2013 at 07:15 PM. Reason: corrected mistake
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Old 3rd December 2013, 08:08 PM   #9
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Hi , mine was built with 2 x transformers, 2 x 35 vac / 300 VA each one and 8 x 10.000uf / 63v panasonic TSH CAPS , resulting in +- 50 vdc for each channel.

Cheers
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Old 3rd December 2013, 08:37 PM   #10
lamir35 is offline lamir35  Israel
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Will going full mono give a noticeable advantage? Some printer have high amper dc transformers, will they do?
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