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
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
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
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
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?)
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?)
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
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
Netlist said:I'm sorry I can't help as the links still don't work for me. Tried different computers, even different locations; same ISP though.
No ping or tracert responce either.
/Hugo
Weird,
I've tried 3 different ISP's on DSL and another on dial-up. All work fine. However, I mounted my divices on the main board so I can't help.
Blessings, Terry
Hugo,
Your redraw looks the same as LGreen's option 1 to me.
What he didn't emphasize is that his other options make use of 2 or three terminal screw connectors in the holes for the ouput devices. That is why he jumpered the gate resistors. I don't see any issues with them, but it wouldn't be the first time I have been wrong
Your redraw looks the same as LGreen's option 1 to me.
What he didn't emphasize is that his other options make use of 2 or three terminal screw connectors in the holes for the ouput devices. That is why he jumpered the gate resistors. I don't see any issues with them, but it wouldn't be the first time I have been wrong
that they would be the same. I did the same when LGreen shared the ideas with me privately before posting. Embarrassing mistake for a lawyer to assume rather than verify. 