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Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
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Old 4th November 2017, 09:11 PM   #51
gionag is offline gionag  Italy
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Hi guys,
still waiting for the pcb to arrive....
I am making some cam program for my hurco to make pockets, hole, threads for all the mosfets and pcbs...
any advice on where to put the thermistor ? i got that is for reducing thermal drift, but i have seen a lot of pictures where many users puts them either straight over mosfet of other over the pcb...

Can you advice a good spot to mount them ?

Thanks
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Old 4th November 2017, 09:21 PM   #52
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Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
you know for any picture of Papa's F5T ?
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Old 4th November 2017, 09:27 PM   #53
gionag is offline gionag  Italy
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Quote:
Originally Posted by Zen Mod View Post
you know for any picture of Papa's F5T ?
... mhhh only from other users, maybe i've missed something important
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Old 4th November 2017, 10:45 PM   #54
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Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
as usual , there are plenty of details to learn , just looking at pictures of origin

in a meantime , as you're searching for either F5 or F5T origin pictures , place body of NTC right against ceramic part of mosfet body

take care that legs of NTC are well away of any metal part , or even better - insulate them.
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Old 5th November 2017, 12:59 AM   #55
gionag is offline gionag  Italy
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Quote:
Originally Posted by Zen Mod View Post
as usual , there are plenty of details to learn , just looking at pictures of origin

in a meantime , as you're searching for either F5 or F5T origin pictures , place body of NTC right against ceramic part of mosfet body

take care that legs of NTC are well away of any metal part , or even better - insulate them.
There's need to clamp it on the ceramic, or is just enough to bend the insulated legs against the mosfet ?
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Old 5th November 2017, 01:04 AM   #56
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Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
bend legs to lean NTC to ceramic part of mosfet

as you can see on pictures here : 6moons audio reviews: FirstWatt F5 , Pa is putting NTC in proximity of mosfet mid pin ; that's convenient enough , with his pcb and parts arrangement (Him - being Founder of FAB Club)

I don't know which pcbs are you using and where exactly NTCs are situated , but you can always extend NTC legs ( heatshrink!!)

wherever you put NTC , difference is just in biasing behavior in time domain ....... more intimate thermal bond of NTC with mosfet case/surround is resulting in lesser and faster Iq change

though , ceramic part of mosfet case is most secure position ....... not one F5 gone Dodo , due to poor NTC going nude in hostile environment

Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
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Last edited by Zen Mod; 5th November 2017 at 01:30 AM. Reason: linked pic
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Old 8th November 2017, 06:33 PM   #57
gionag is offline gionag  Italy
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Quote:
Originally Posted by Zen Mod View Post
bend legs to lean NTC to ceramic part of mosfet

as you can see on pictures here : 6moons audio reviews: FirstWatt F5 , Pa is putting NTC in proximity of mosfet mid pin ; that's convenient enough , with his pcb and parts arrangement (Him - being Founder of FAB Club)

I don't know which pcbs are you using and where exactly NTCs are situated , but you can always extend NTC legs ( heatshrink!!)

wherever you put NTC , difference is just in biasing behavior in time domain ....... more intimate thermal bond of NTC with mosfet case/surround is resulting in lesser and faster Iq change

though , ceramic part of mosfet case is most secure position ....... not one F5 gone Dodo , due to poor NTC going nude in hostile environment
Perfect, got it.

Today i have ordered to a local company 4x inductors, 1mH / 0.04Ω rated for 10A. They'll make on a toroidal iron core.
The main PCB was stuffed with all the components, and this weekend i will CNC-drill all the holes on the heatsinks so i can start attaching the boards and start some preliminary tests.

The finished case form-factor will be something like the images attached.

Wish me luck
Attached Images
File Type: png case1.PNG (413.4 KB, 214 views)
File Type: png case2.PNG (272.6 KB, 214 views)

Last edited by gionag; 8th November 2017 at 07:01 PM. Reason: tried to fix my bad english...
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Old 20th November 2017, 10:32 PM   #58
gionag is offline gionag  Italy
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some days are passed. And i still trying to recover from a bad flu.

Next step will be the machining of the heatsink, so i can finally attach the mosfets and start tuning the system.

In the meantime i have received previous ordered inductances of 2mH 10A.

i start planning the power supply for the tests.

I have on hand a 1400VA toroid with 230v input and 2x38Vac secondaries.
I have made some pcbs to mount the same MUR3020 i use on the channel for rectification... and my idea is to make a 38-0-38 Center tap, with dual bridge and then 44mF+2mH+44mF each rail. this will end up in something like 55Vdc unloaded.


What do you think about this arrangement ?
There are advantages (from your honorable experiences) in using a 0-38 + 0-38 with dual bridge over a center tapped solution ?
Attached Images
File Type: png F5_PS.PNG (86.2 KB, 180 views)

Last edited by gionag; 20th November 2017 at 10:39 PM.
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Old 23rd November 2017, 11:10 PM   #59
gionag is offline gionag  Italy
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Join Date: Jun 2007
Quote:
Originally Posted by gionag View Post
some days are passed. And i still trying to recover from a bad flu.

Next step will be the machining of the heatsink, so i can finally attach the mosfets and start tuning the system.

In the meantime i have received previous ordered inductances of 2mH 10A.

i start planning the power supply for the tests.

I have on hand a 1400VA toroid with 230v input and 2x38Vac secondaries.
I have made some pcbs to mount the same MUR3020 i use on the channel for rectification... and my idea is to make a 38-0-38 Center tap, with dual bridge and then 44mF+2mH+44mF each rail. this will end up in something like 55Vdc unloaded.


What do you think about this arrangement ?
There are advantages (from your honorable experiences) in using a 0-38 + 0-38 with dual bridge over a center tapped solution ?
anyone ?
Attached Images
File Type: jpg chassis_v2_new.jpg (71.0 KB, 154 views)
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Old 24th November 2017, 05:52 AM   #60
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Y.A.F5Tv3.B.T. Yet another F5Tv3 Build Thread
better to use two bridges arrangement

rest ........ no complaints
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