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Old 21st March 2014, 08:58 AM   #41
Crom is offline Crom  United Kingdom
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nice job Kenneth, if you are able to you really should get rid of that fan as removing it will cure a few potential problems - vibration, odd magnetic fields and noise on the power line. When I did it, it wasn't a night and day change but well worth it. I replaced it with a large heatsink but I did have one of the lower power-rated CPUs.
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Old 19th June 2014, 08:51 AM   #42
SGK is offline SGK
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analog-sa

What did you do for the -12V? Did you simply leave it unconnected?
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Old 20th June 2014, 12:37 PM   #43
Crom is offline Crom  United Kingdom
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I'm sure analog-sa will be along in a minute but maybe this will help. -12v is pretty much legacy for the ATX spec and many motherboards will boot up comfortably without it. However, it's pretty much test yours and if it does you're in luck. If not, then you'll need -12v.
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Old 20th June 2014, 01:01 PM   #44
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Precisely. My MB does not require -12v.
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Old 20th June 2014, 01:11 PM   #45
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Thx. I have an ASRock Z87E-ITX mobo and am building a linear PSU. I'm hoping I can simply leave the -12V disconnected. I guess I could test with an extension between the ATX socket and the existing picoPSU, simply cutting the -12V supply and seeing if it will boot...
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Old 10th November 2015, 01:19 AM   #46
jborden is offline jborden  United States
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Default Logic circuit for Linear to ATX

In case there is interest to come close to meeting the ATX specification, this circuit may help to supply the logic. Into this circuit Linear supplies can be plugged. Zener diodes ensure each supply is in range in case, e.g. batteries, are being used. When power enabled, the Omron relays switch the power on.

linear-atx-logic.pdf
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Old 10th November 2015, 08:22 AM   #47
SGK is offline SGK
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I finished my project in this regard. I built 3 'super regulator' power rails capable of 5A+. I also built an ATX power control board based on the TPS3510. This chip monitors the supplies and coordinates with the computer motherboard for PWR-ON sequencing etc. This board includes a pre-amplifier for measuring the quality of the supply rails. I attach the circuit for ATX PSU control and a pic of the completed board, plus a pic of the power rails on their heatsink.
Attached Images
File Type: jpg ATX PSU Control 1.jpg (311.7 KB, 126 views)
File Type: png ATX PSU mgt pcb circuit.png (90.1 KB, 123 views)
File Type: jpg ATX PSU 3.jpg (298.3 KB, 124 views)
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Old 10th November 2015, 05:33 PM   #48
jborden is offline jborden  United States
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Quote:
Originally Posted by SGK View Post
I finished my project in this regard. I built 3 'super regulator' power rails capable of 5A+. I also built an ATX power control board based on the TPS3510. This chip monitors the supplies and coordinates with the computer motherboard for PWR-ON sequencing etc. This board includes a pre-amplifier for measuring the quality of the supply rails. I attach the circuit for ATX PSU control and a pic of the completed board, plus a pic of the power rails on their heatsink.
Nice, that circuit is simpler than mine. In regards to using FET vs. relay to switch current: any big advantage? Assuming we want as low noise as possible (not that its needed for ATX but for the sake of discussion), which switch is best? Let's say we want to switch signal path, FET vs. relay? are the Omron quiet (electrically)?
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Old 10th November 2015, 11:32 PM   #49
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Quote:
Originally Posted by SGK View Post
I finished my project in this regard. I built 3 'super regulator' power rails capable of 5A+. I also built an ATX power control board based on the TPS3510. This chip monitors the supplies and coordinates with the computer motherboard for PWR-ON sequencing etc. This board includes a pre-amplifier for measuring the quality of the supply rails. I attach the circuit for ATX PSU control and a pic of the completed board, plus a pic of the power rails on their heatsink.
I'm impressed, very nice project.

I was way lazier, I found a motherboard that doesn't care about the power on sequencing. I made supplies for +5 and +3.3, and used an off the shelf for 12.
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Old 4th January 2016, 12:56 PM   #50
jrling is offline jrling  United Kingdom
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Quote:
Originally Posted by SGK View Post
I finished my project in this regard. I built 3 'super regulator' power rails capable of 5A+. I also built an ATX power control board based on the TPS3510. This chip monitors the supplies and coordinates with the computer motherboard for PWR-ON sequencing etc. This board includes a pre-amplifier for measuring the quality of the supply rails. I attach the circuit for ATX PSU control and a pic of the completed board, plus a pic of the power rails on their heatsink.
Very impressive work.
Would you be offering them for sale or were they one-off for you?

Thanks
Jonathan
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