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Alternate First Watt Power Supply Schematic
Alternate First Watt Power Supply Schematic
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Old 10th January 2019, 06:09 PM   #1
vdi_nenna is online now vdi_nenna  United States
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Question Alternate First Watt Power Supply Schematic

Anyone know where I can find the First Watt (FW) schematic that allows channel separation via the filter caps?
Saw it somewhere in the middle of a thread.
Looks almost exactly like the standard FW power supply, except a part of the supply rail is disconnected before the last reservoir cap.

Can anyone verify whether or not this version helps with channel separation or is it a "six or one half dozen" situation?

Thanks,

Vince
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Old 10th January 2019, 06:28 PM   #2
vdi_nenna is online now vdi_nenna  United States
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Never mind, I found it!
Had it as F7 PS.
Maybe this will help someone else.

Still like to know if there is an advantage to this type of power supply.
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File Type: jpeg F7 ps.jpeg (93.0 KB, 811 views)
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Old 10th January 2019, 08:34 PM   #3
JeffYoung is offline JeffYoung  Ireland
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Alternate First Watt Power Supply Schematic
Hi Vince,

I've got a board design for that if you're interested.

Mine uses 8 large caps instead of 12 smaller ones, and 12 Panasonic 3W resistors instead of 4 larger ones. It has holes for the line thermistor and a ground lift thermistor.

Boards just came back from Eurocircuits today, so I haven't tested them yet. But I'd be happy to post the Kicad files (or Gerbers) once I have if anyone is interested.

Cheers,
Jeff.
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File Type: jpg Decoupled PSU front.jpg (253.0 KB, 739 views)
File Type: jpg Decoupled PSU rear.jpg (162.1 KB, 769 views)
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Old 10th January 2019, 08:45 PM   #4
vdi_nenna is online now vdi_nenna  United States
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That's really great Jeff!

I have KiCAD, don't know how to use it effectively, but can load a file.
Gerber files would be great too.

Let us know how it goes.

Vince
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Old 10th January 2019, 08:53 PM   #5
Juntuin is offline Juntuin  Finland
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Jeff, definitely interested here also
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Old 10th January 2019, 08:54 PM   #6
vdi_nenna is online now vdi_nenna  United States
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The U.S. uses 2 line thermistors.
Am I reading that wrong?
Could by-pass this part anyway.
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Old 10th January 2019, 09:07 PM   #7
Soundhappy is offline Soundhappy  France
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FW style psu with choke filtering are interesting option imho.
Maybe Diyers produce some pcb boards for the Hammonds chokes use.
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Old 10th January 2019, 09:25 PM   #8
silasmellor is online now silasmellor  Denmark
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Alternate First Watt Power Supply Schematic
Nice, boards, they look similar to the ones used in the commercial FW products. If you end up having any to spare, i'd be interested in a couple.
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Old 10th January 2019, 09:34 PM   #9
Bare is offline Bare  Canada
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Quote:
Originally Posted by vdi_nenna View Post
Anyone know where I can find the First Watt (FW) schematic that allows channel separation via the filter caps?

Vince
Erm... isn't the DIY shops' PCB 'breakable' into 2 discrete P Supplies ?
Just need to use 2 transformers
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Old 10th January 2019, 09:48 PM   #10
Dennis Hui is offline Dennis Hui  Canada
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Alternate First Watt Power Supply Schematic
Unfortunately each half handles only a single polarity.
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