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Just another lateral FET amp
Just another lateral FET amp
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Old 24th July 2019, 09:07 PM   #11
voltwide is offline voltwide  Ireland
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This is not so evident, but nonetheless easy to explain. The pcb will be mounted parallell to a heatsink (200*300*20mm) in a short distance of approx 10mm. Each TO-3 will be mounted onto an alu profile 50*100mm, 3~4mm thick. This will be mounted on a massive alu rod (10*10 upto 20*20mm, 100mm long). The resulting heat conductor will be screwed to the aforementioned big heatsink (I have just a pile of them, stored since the eighties)
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Last edited by voltwide; 24th July 2019 at 09:10 PM.
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Old 24th July 2019, 09:14 PM   #12
voltwide is offline voltwide  Ireland
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Quote:
Originally Posted by Tournesol View Post
Nice VFA, Voltwide. I like the current mirror.
Just a question, how are-you going to cool the HEXFETS ?
Btw, there are no HEXFETs, and the hole circuit is not designed for them.
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Old 25th July 2019, 12:32 AM   #13
Tournesol is online now Tournesol  Belgium
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Quote:
Originally Posted by voltwide View Post
Btw, there are no HEXFETs, and the hole circuit is not designed for them.
The Hitachi MOSFETs, sorry ;-)
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Old 25th July 2019, 01:09 AM   #14
tsmith1315 is online now tsmith1315  United States
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Neat, thanks for posting. You're lucky to have those metal can FETs to play with!
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Old 30th July 2019, 08:52 AM   #15
voltwide is offline voltwide  Ireland
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After a lot of hassle with AllPCB, DHL express and the customs I finally received the PCBs. As a result AllPCB now is on my personal "ignore list".
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File Type: jpg pcb_top_IMG_20190730_101904539.jpg (208.1 KB, 629 views)
File Type: jpg pcb_bot_IMG_20190730_102801775_HDR.jpg (157.5 KB, 626 views)
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Last edited by voltwide; 30th July 2019 at 08:55 AM.
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Old 30th July 2019, 02:41 PM   #16
Walkalone is offline Walkalone  Viet Nam
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Hi Voltwide,
How is the quality of these PCBs? I've ordered many PCBs from Chinese but there is no anywhere i actually feel OK.

Regards,
Cuong Nguyen
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Old 30th July 2019, 02:51 PM   #17
mlloyd1 is offline mlloyd1  United States
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Just another lateral FET amp
nice project.
just curious to know if have you looked at the clipping behavior?

mlloyd1
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Old 30th July 2019, 04:26 PM   #18
nigelwright7557 is offline nigelwright7557  United Kingdom
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Quote:
Originally Posted by Walkalone View Post
Hi Voltwide,
How is the quality of these PCBs? I've ordered many PCBs from Chinese but there is no anywhere i actually feel OK.

Regards,
Cuong Nguyen
I use JLCPCB mostly but have used PCBWAY.

The quality has been amazing even on fine scale SMD with very small via's.

I sometimes get JLCPCB rejecting my files for silly reasons.
I just resend the same files and next time someone different scans them and they go through.
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Old 30th July 2019, 05:21 PM   #19
voltwide is offline voltwide  Ireland
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Quote:
Originally Posted by mlloyd1 View Post
nice project.
just curious to know if have you looked at the clipping behavior?

mlloyd1

Thank you. I did not check this seriously in simulation - waiting for real result to come. But there will be 2 clamp diodes providing unsaturated clipping in case the driver circuit will be fed by some bootstrapped supply (refer to aux supply).
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Last edited by voltwide; 30th July 2019 at 05:24 PM.
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Old 30th July 2019, 05:27 PM   #20
voltwide is offline voltwide  Ireland
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Quote:
Originally Posted by nigelwright7557 View Post
I use JLCPCB mostly but have used PCBWAY.

The quality has been amazing even on fine scale SMD with very small via's.

I sometimes get JLCPCB rejecting my files for silly reasons.
I just resend the same files and next time someone different scans them and they go through.

The trouble with Allpcb was they offer "DHL" - but they send by DHL-express. Being asked they strictly deny DHL-express - although I have the 1.hand information from DHL-express that AllPCB is their customer. So, whom do you think I will believe?
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