M400 diy kit with 2SK1058/J162 chip

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#3
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.
 
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#4
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:
As a general guide you can select transformer from +- 35vdc (producing 70 wrms/8 ohms) to +-58v (135 wrms/8ohms) 3amp per channel.
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#6
burbeck said:
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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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.
 
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#8
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.
 
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#11
hcbonfim said:
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.
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Hi, thanks for your comment.

Questions:
1. how did you wire the primaries and secondaries?
2. have you had any problems starting the 2 300VA transformers, ie. blown fuses?
3. and did you install a soft start or NTC resistors or something to aid?

Thank you!
 
#12
I used 4 ultrafast diodes in bridge mode followed by 4 x 10.000uf caps. The transformers are center tapped. For the inrush current i used 01 x CL 60 THERMISTOR at primary of the transformers and a fuse for shure. A basic but very good ps.

CHEERS
 
#15
hcbonfim, thanks again for explanation, most helpful.

I am on same track with lamir35 about the outputs. Can you elaborate on that? Connecting the 2 35v outputs in parallel or series and you ended up with +-50v? Is this because of losses or how this works? What is the proper way to connect the 2 outputs?

Please anybody, explain this as my knowledge in transformers is seriously lacking and I hope to learn more.

lamir35 said:
How do you calculate the duration of the high amperage during start up to know if the limiter is needed?
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To my understanding if you have about 550VA or bigger transformer you might start to see fuse failures and you will need a solution to control inrush current. Large capacitor banks can also suck so much "juice" you will have this problem.

BTW. I bought 8 Panasonic 63V 10000uF caps for twin power supplies from H/D AMP with my kits. He also provided me the diode bridges. I have planned to install a soft start unit which has NTC resistors and a relay to bypass them.
 
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