redesign of leach amp pcb for integrated TO-247 output devices - Page 7 - diyAudio
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Old 18th September 2002, 11:05 PM   #61
haldor is offline haldor  United States
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Hi Brian,

If you place a big order, I'd take a couple of boards from you. Any idea how much you would ask for say 4 boards?

Phil
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Old 19th September 2002, 01:34 AM   #62
herm is offline herm  United States
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Default Power dissipation

Has anyone calculated how much power will be dissipated
in the main sinks (per channel) with the new design?
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Old 19th September 2002, 05:42 PM   #63
UrSv is offline UrSv  Sweden
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Jens,

Where did you get those heatsinks? They look perfect for my amp...

/UrSv
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Old 19th September 2002, 06:18 PM   #64
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Default Heatsinks

I got my heatsinks from

Deltron Conelec A/S
Banemarksvej 50B
2605 Brøndby
Denmark

The Model is S245

Hope it works out for you

\Jens
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Old 21st September 2002, 05:56 PM   #65
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Default Hum

Hi Brian

You are using graundplane right ?

How is R51 mounted ?? I haven't mounted it, and it seams to give a littel bit of hum. I can hert it if i the room is silent, and no signal i connected to the input.

Also the input cap seems to suffer from "mikrofonia" (If I tap it, there is a sound in the speaker). What type do you use ?

How is your ground layed out ?

\Jens
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Old 22nd September 2002, 05:46 PM   #66
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Jens:

>>b) The large caps<<

Right, caps at 0 voltage act pretty much like a dead short when the transformer turns on.

I'm looking at this issue now, I want to use a 1000va or 1500va amp for my 6-10 channel home theater project; I'm worried about inrush.

When looking at relays for output protection and turn on thump, I started thinking of using a capacitor bank, and then switching each set of cap's with a few relays on a timer. If I used DPDP relays, you could even use a fairly large resistor then when the caps get charged, they would self - power the relay to cut out the resistor.

On another thread there are some thermistor examples for the same thing, but I'd like to avoid the heat if possible.

Sorry for disgressing on the thread in answering the question.

The amp looks fantastic, by the way!
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Old 24th September 2002, 07:11 PM   #67
SteveA is offline SteveA  United States
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Cool Leach redesign

Brian-
I would be interested in a couple of boards, if an when they become available.
Steve
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Old 24th September 2002, 08:12 PM   #68
BrianGT is offline BrianGT  United States
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I have the boards ready to send off, but I am going to do more testing with the new boards first. I have tested them with a benchtop power supply, but I want to get the entire thing done before I order boards. It should not take me too long.

--
Brian
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Old 25th September 2002, 06:10 AM   #69
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Doh!

Sorry about that, I was replying to the last note on page 1, after a ton of people gave answers already. Sorry for jumping in!

I will say it again, you guys have a nice looking set of amps!
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Old 4th October 2002, 03:33 PM   #70
G is offline G  United States
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Hi Brian,

Please let us know when your board is available. Post pics too. I think that the interest in these boards is high. Thanks for the hard work from all of us beginners. "Now where to buy the heatsinks and a chassis" he ponders out loud.
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