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Old 30th November 2010, 05:06 PM   #51
Marra is online now Marra  United Kingdom
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Originally Posted by johnm View Post
Can the mosfets not just be desoldered, and instead mounted to the underside of the board (so bending the legs UP to fit the PCB)? I would have thought that would then easily allow it to be mounted to the chassis base, and allow that to be used as the heatsink?

- John
This is exactly what I did with my Blue Hypno; the 6mm bottom plate barely gets warm.
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Old 30th November 2010, 05:24 PM   #52
johnm is offline johnm  United Kingdom
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Originally Posted by Marra View Post
This is exactly what I did with my Blue Hypno; the 6mm bottom plate barely gets warm.
Ah my mistake actually - I believe he's talking about the rectifier's being the problem to mount underneath rather than the mosfets. That'll teach me to post too fast
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Old 30th November 2010, 05:28 PM   #53
Marra is online now Marra  United Kingdom
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Originally Posted by johnm View Post
Ah my mistake actually - I believe he's talking about the rectifier's being the problem to mount underneath rather than the mosfets. That'll teach me to post too fast
You're right John; missed that too.
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Old 30th November 2010, 07:07 PM   #54
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Japan is a funny country: you can buy Toshiba jfet at the grocery store, but if you ask for a BC, they look you like an alien. I forgot to add BC517 to my mouser order, I have BC550 and BC560. Can I replace the 517 with something else? what are the important parameters for this part?

Thanks,

D.
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Old 30th November 2010, 07:17 PM   #55
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We got some osciallation on the relay's originally with two BC546's in the prototypes last year in some cases. a .15 cap used (I forgot how) can solve it if it occurs.

The BC517 solved that problem. You'd hear it if it occurs, the board will make a 'hiss'.
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Old 30th November 2010, 11:54 PM   #56
Salas is online now Salas  Greece
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Quote:
Originally Posted by Nikon1975 View Post
Japan is a funny country: you can buy Toshiba jfet at the grocery store, but if you ask for a BC, they look you like an alien. I forgot to add BC517 to my mouser order, I have BC550 and BC560. Can I replace the 517 with something else? what are the important parameters for this part?

Thanks,

D.
The current gain is important. Must be a Darlington. Else use that 150nF between C,B of the normal BC5xx you got. Use a small film cap and patch at board's underside.
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Old 3rd December 2010, 12:01 AM   #57
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For the led strings, is it important to match them exactly at 9 and 5.4 V or is more important to match the + and - side ? My leds are very consistent at 1.82, so I have no problem to match + and -, but hard time to get below 9.3 V.

(
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D.
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Old 3rd December 2010, 12:06 AM   #58
Salas is online now Salas  Greece
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Don't worry much. You are in a good frame. The supplies are manipulated for a certain ratio of current offset in the reference strings in the Mez anyway. Vo will never match. That is in hot rod Hypno only.
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Old 3rd December 2010, 01:32 PM   #59
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I am going to build a hotrod version by using two boxes one is for the transformer, so my problem is the way to transfer power AC or DC?

Using DC
transformer >>> rectifiers >>> a big cap of 22000uf (I have alot of them...cheap rubicon)>>> cable 1m >>> one 4700uf (or another one 22000uf?)>>> DCB1
Is this a good configuration?
thanks
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Old 3rd December 2010, 01:50 PM   #60
AndrewT is offline AndrewT  Scotland
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so my problem is the way to transfer power AC or DC?
feed smoothed DC between the two boxes arrangement.
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