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FW B5 DIY! anyone??
FW B5 DIY! anyone??
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Old 24th December 2017, 02:47 AM   #41
Doppler9000 is offline Doppler9000  Canada
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This seems like a good buy.

Soldering Station with Adjustable Heat Range with US Plug (US Warehouse)
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Old 24th December 2017, 05:26 AM   #42
EUVL is offline EUVL  Europe
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> I have brought 250,000 Jfets into inventory .....

Say it takes 1 minute to measure Idss and label / sort one of them.
And assume 40 hour week, 2 weeks holiday a year, no illness, ..... etc.
That will take a touch more than 2 year for one operator.
Unless of course you are already fully automated & computerised.




Merry Christmas,
Patrick
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Old 24th December 2017, 05:08 PM   #43
Nelson Pass is offline Nelson Pass  United States
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FW B5 DIY! anyone??
It takes about 10 seconds each, which amounts to something
like 700 hours.

Merry Christmas Patrick.

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Old 24th December 2017, 05:12 PM   #44
EUVL is offline EUVL  Europe
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Quick hands.

We struggle to do one in 2 minutes.
Different matching though.



Merry Christmas and Happy New Year to you too,
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Old 24th December 2017, 05:18 PM   #45
Nelson Pass is offline Nelson Pass  United States
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FW B5 DIY! anyone??
You are probably measuring noise as well.

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Old 24th December 2017, 05:42 PM   #46
EUVL is offline EUVL  Europe
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The matching is probably the easiest bit.
The nightmare is the sorting and packing in sets afterwards.
Not everything can be (partially) automated.




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Old 2nd January 2018, 04:55 PM   #47
ponger is online now ponger  United States
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Hello Mr. Pass,

I am the happy owner of a B4 crossover. I replaced the supplied power supply with a lab grade linear power supply which provide a noticeable improvement. I was looking forward to building one of your diy crossovers without switches. I noticed in an earlier post that you were planning on using an external power supply with all the versions of the crossovers. I imagine that you were planning on the same switching supply as the B4. Is it possible for you to design a linear supply to go with your diy crossovers? I think it would be a worthy improvement.

Thank you for all your help to us diyers.
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Old 2nd January 2018, 05:24 PM   #48
Cappy is offline Cappy  United States
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It seems to me that a linear power supply design for the First Watt B4/B5 or the DIY versions that are coming is something that we can do here as a group.

There are going to be a lot of DIYers that make Nelson's active crossovers. Some will want to try a good integrated linear supply.

In the shower, I've been thinking about a choke loaded PSU with a Salas low voltage shunt regulator. But there are plenty of other possible approaches too.
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Old 2nd January 2018, 06:17 PM   #49
Nelson Pass is offline Nelson Pass  United States
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FW B5 DIY! anyone??
For the purpose of compatibility, I will generally be operating off +24V DC
single ended supply, and plan to provide slow turn-on filters, along with
relays to suppress turn on/off.
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Old 4th January 2018, 11:51 PM   #50
ponger is online now ponger  United States
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That would be great to do a group power supply design, especially if the single supply would work for all the versions of the crossover.
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