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Old 28th October 2013, 09:19 AM   #1
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Default PSU for Calvin buffer

Gentlemen, I have layouted a simple PSU-PCB for use with the Calvin buffers.
It uses a EI42 - 230VAC print-transformer and 7818 / 7918 voltage regulators.

The size of the PCB is 88 x 53 mm; the PCB is double-sided, made of 1.6mm FR4 with 70m copper coating.

I have ordered 20 PCBs. The PCBs will be delivered in about 4 weeks.
The price for 2 PCBs incl. worldwide-shipping is 13€.

Please tell me, if you are interested having a pair of these PCBs.

Best regards - Rudi_Ratlos
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Old 28th October 2013, 09:25 AM   #2
JBdV is offline JBdV  Netherlands
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2 for me please
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Old 3rd November 2013, 11:59 AM   #3
AndrewT is offline AndrewT  Scotland
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The input and output decoupling caps are too far away from the reg pins.
Both legs of the x7r caps should be VERY near the chip pins.
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regards Andrew T.
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Old 4th November 2013, 12:29 AM   #4
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Rudi,
Not sure if you picked it up on other thread but since you are making it 120V compatible I will take a couple.

Bill
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Old 4th November 2013, 03:17 PM   #5
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Bill, you are of course right, and I have layouted a neat PSU for the CALVIN-buffer (see attached image).

But: the used TAMURA-transformer (3FD-336), which will support both 115VAC and 230VAC primary, will not be "strong" enough to sink 2 CALVIN buffers!
So you need 1 PSU per CALVIN-Buffer PCB - and this has been the reason why I have hesitated to offer you this PSU.

I will happily offer you 10 of the 3FD-336 - PCBs for a very (!) decent price (10 PCBs is the minimum amount of PCBs to order), but it will then be your your job
to find some of fellow countrymen, who would like to have these PCBs as well.

Best regards - Rudi_Ratlos
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Old 4th November 2013, 04:41 PM   #6
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Rudi,
I see what you are saying, I have a few Salas shunt power supply boards I can use with a separate transformer. It just will not fit in the the case with the VCPre, no real big deal I can build it in a case of it own. I would not have issue buying 10 for myself if it could support 2 buffers, but as you point out the current output is not high enough to be useful for many projects.

Thanks for your efforts the same.

Bill
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Old 7th November 2013, 08:33 PM   #7
gig is offline gig  Italy
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Hi Rudi, I'll be happy to take 2 pcbs if still available.
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Old 9th November 2013, 12:07 PM   #8
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Gig, I am unhappy to tell you that all of my PSU - PCBs have already been sold.
I can do a new order, but the minimum amount of PCBs to order is 10 pcs.
One PCB will cost 4€.

The PCB will support 230VAC print-transformers only.

Best regards - Rudi_Ratlos
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Old 9th November 2013, 09:16 PM   #9
brianco is offline brianco  Ireland
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Hi Rudi,

I have only just discovered this thread.

Does your ordered list include the early 'orders' from the original thread?

Calvin Buffer for Paradise

Many thanks,

Brian
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Old 10th November 2013, 02:26 PM   #10
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Yes it does, Brian.
Best regards - Rudi_Ratlos
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