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> Solid State Relay Board
peteyd
post Apr 3 2020, 02:38 PM
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QUOTE(Mikey914 @ May 16 2017, 12:00 PM) *

We've been spending some time putting together a redesigned board with solid state relays. I have to finish the 19mm master cylinders before I jump full bore into this, but these would look OEM until you pop the cover.

@Mikey914 have you made any progress on this project?

I am interested for a build here.

Pete
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mbseto
post Apr 3 2020, 03:45 PM
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I'd volunteer to create an STL file (i.e. a file for a 3D printer) for the board itself if someone can help with component selection and placement on said board.
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Spoke
post Apr 3 2020, 05:20 PM
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What needs to be done on this? Looks like it would be a PCB, some components, a frame of sorts, and some epoxy. I could help with the PCB if needed.
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Mikey914
post Apr 3 2020, 07:19 PM
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QUOTE(peteyd @ Apr 3 2020, 01:38 PM) *

QUOTE(Mikey914 @ May 16 2017, 12:00 PM) *

We've been spending some time putting together a redesigned board with solid state relays. I have to finish the 19mm master cylinders before I jump full bore into this, but these would look OEM until you pop the cover.

@Mikey914 have you made any progress on this project?

I am interested for a build here.

Pete

Actually we are working on the board. We decided that with the reliability of the relays we are making now going through 500,000 cycles the solid state thing built into the board, is really an added expense for no real extra value. The new boards are underway now.
Mark
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Spoke
post Apr 3 2020, 08:24 PM
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QUOTE(Mikey914 @ Apr 3 2020, 09:19 PM) *

Actually we are working on the board. We decided that with the reliability of the relays we are making now going through 500,000 cycles the solid state thing built into the board, is really an added expense for no real extra value. The new boards are underway now.
Mark


Solid State relays are quite sexy but not really needed here. High speed and extra cost are not advantages in the 914. Good call to stay with mechanical relays.

A little side story about SS relays. I'm a consultant for a major rail manufacturer and I was brought in a couple of years ago to analyze failures of a certain board with a high number of returns. It was a very complicated board with several power supplies, CPUs, FPGAs, and a lot of analog circuits on the board. I narrowed down a majority of failures to a particular SS relay on the board. There were six of these SS relays. They would not turn on. They had an LED input and LED receptors on the output side. Over time the current transfer ratio (CTR) would decay to the point where the relays would not turn on and the board would fail.

On one board someone thought a large FPGA had failed and it was replaced. The board worked fine for about 4 months then failed again. The FPGA was the driver for the SS relays. In my investigation I found that the SS relay could be annealed with heat and its CTR improved which is what happened on this board. The heat of removing and replacing the FPGA annealed one of the relays but it failed a short time later.

Here's the kicker: The relay was originally designed and manufactured by Bell Labs in the 1980's. I was in that group which designed the SS relays and I knew the part number. I did not design that SS relay. I did receive my one and only US patent with a SS relay. If you're interested, it's patent # US5360979A.

Spoke's SS Relay Patent
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Mikey914
post Apr 3 2020, 08:54 PM
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Size is really the issue. They are relitively inexpensive now, but we chose to improve the product we all need and make new boards that we may all need too.

BTW here's the latest.


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GregAmy
post Apr 3 2020, 09:03 PM
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I suggest that one of the biggest failures on these boards is the physical contact between relay pins and the sockets.

If someone makes a board with new sockets and non-relaxed pins, it would likely be a good replacement and last for another half-century.
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Mikey914
post Apr 3 2020, 09:15 PM
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That's where we are going with this.
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peteyd
post Apr 6 2020, 06:04 AM
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QUOTE(Mikey914 @ Apr 3 2020, 05:19 PM) *

QUOTE(peteyd @ Apr 3 2020, 01:38 PM) *

QUOTE(Mikey914 @ May 16 2017, 12:00 PM) *



@Mikey914 have you made any progress on this project?

I am interested for a build here.

Pete

Actually we are working on the board. We decided that with the reliability of the relays we are making now going through 500,000 cycles the solid state thing built into the board, is really an added expense for no real extra value. The new boards are underway now.
Mark



Good news! (IMG:style_emoticons/default/aktion035.gif) I look forward to seeing the end product

Pete
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