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Old 16th February 2006, 09:39 AM   #1061
panos29 is offline panos29  Greece
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Default J-fet Aleph-X anybody?

I very well understand that I may be a bit off topic but I thing thats the right place to ask a silly(maybe not) idea that came to my mind today.
Of course as i did not red all the threads, somebody else may have though of it before.
So here it is, since I only need less than 10W of power for my horn loaded 15" tannoys, I would like to ask if it is possible to build an aleph-x using extremely low voltage, something like +/-8V lets say. I know this is not possible with IRFP240s as the point falls out of linear region.
BUT what if we try the lovely Lovotech's Jfets that happen to work very linearly in that voltage region?

Regards,

Panos
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Old 16th February 2006, 03:53 PM   #1062
gl is offline gl  United States
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Hi Panos29,

Look in the main Aleph-X thread. There was a large discussion on a JFET front end for the Aleph-X. It eventually died. There were too many power dissipation related issues.

You are correct about the MOSFET non-linearity issues with low rail voltages. It's been discussed a lot.

Other than that your idea of a JFET input / JFET output low power Aleph-X is a good one and I would encourage you to go for it. I figure you're not the only one that's had this idea.

Regards,
Graeme
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Old 17th February 2006, 04:25 AM   #1063
lgreen is offline lgreen  United States
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Default Aleph X High Power Connections

Hello everyone, I've been looking at the A-X high power connections to multiple MOSFETs. Seems like there is some talk about how to connect these but nothing definitive. So I have looked at all this and I think it goes as follows, let me know if this is wrong-

Aleph X Schematic (left side) Multiple Outputs

Here are some options for using this information to connect Grey's boards to multiple output devices (again please post if any of these are incorrect).

Aleph X Multiple Devices Option 1

Aleph X Multiple Devices Option 2

Aleph X Multiple Devices Option 3

I think I'll use Option 3, which appears to be the best.

- thanks

(Killowatski- do the output boards look familiar?)
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Old 21st February 2006, 03:56 PM   #1064
lgreen is offline lgreen  United States
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Default a little help?

Is this a hard question?

I did not mean to shut down the thread for 5 days.
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Old 21st February 2006, 06:54 PM   #1065
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Hi,

itīs not a hard question. Maybe itīs too simple?

I used option 4 wich connects the V+ from the board edges like you connected V-
The rest is OK although you can leave out the jumpers for the gate resistors and connect the wires on the other side.

William
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Old 21st February 2006, 07:45 PM   #1066
Netlist is offline Netlist  Belgium
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Default Re: a little help?

Quote:
Originally posted by lgreen
Is this a hard question?

I did not mean to shut down the thread for 5 days.
I looked but the links didn't work and still don't. Timeout’s after 10'.
I'm sure William's answer will be adequate.

/Hugo
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Old 21st February 2006, 08:51 PM   #1067
lgreen is offline lgreen  United States
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Default links

? are you sure the links don't work, i just tried all 3 and it works for me.
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Old 22nd February 2006, 02:55 AM   #1068
lgreen is offline lgreen  United States
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Default Re: Aleph X High Power Connections

I've edited the links- please don't wait 5 more days to tell me this does not work.

Hello everyone, I've been looking at the A-X high power connections to multiple MOSFETs. Seems like there is some talk about how to connect these but nothing definitive. So I have looked at all this and I think it goes as follows, let me know if this is wrong-

Aleph X Schematic (left side) Multiple Outputs

Here are some options for using this information to connect Grey's boards to multiple output devices (again please post if any of these are incorrect).

Aleph X Multiple Devices Option 1

Aleph X Multiple Devices Option 2

Aleph X Multiple Devices Option 3

I think I'll use Option 3, which appears to be the best.

- thanks
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Old 22nd February 2006, 09:57 AM   #1069
Netlist is offline Netlist  Belgium
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Sorry, I can't make them work.
Even http://www.parttimeprojects.com/ gives a timeout.

/Hugo
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Old 22nd February 2006, 10:40 AM   #1070
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the links all work for me
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