NMS Subrack COW when? 😆
November 2, 2024 at 3:12 AM
NMS Subrack COW when? 😆
megacollc.com/product/eric...
ERICSSON Subrack AAM 20P Access,Module Magazine - BFD5990281 #MegaComponents #Ericsson #EricssonHardware #TelecomEquipment #TelecomNetwork #NetworkInfrastructure #Telecommunications #WirelessInfrastructure #5GNetwork #AccessModule #Subrack #BFD5990281
ERICSSON Subrack AAM 20P Access,Module Magazine - BFD5990281 #MegaComponents #Ericsson #EricssonHardware #TelecomEquipment #TelecomNetwork #NetworkInfrastructure #Telecommunications #WirelessInfrastructure #5GNetwork #AccessModule #Subrack #BFD5990281
July 23, 2026 at 12:58 AM
megacollc.com/product/eric...
ERICSSON Subrack AAM 20P Access,Module Magazine - BFD5990281 #MegaComponents #Ericsson #EricssonHardware #TelecomEquipment #TelecomNetwork #NetworkInfrastructure #Telecommunications #WirelessInfrastructure #5GNetwork #AccessModule #Subrack #BFD5990281
ERICSSON Subrack AAM 20P Access,Module Magazine - BFD5990281 #MegaComponents #Ericsson #EricssonHardware #TelecomEquipment #TelecomNetwork #NetworkInfrastructure #Telecommunications #WirelessInfrastructure #5GNetwork #AccessModule #Subrack #BFD5990281
arXiv:2503.06714v1 Announce Type: new
Abstract: We prove the following: If $G$ is a finite solvable group and $H$ is another group whose subrack lattice is isomorphic to the subrack lattice of $G$, then $H$ is a solvable group and the derived length [1/2 of https://arxiv.org/abs/2503.06714v1]
Abstract: We prove the following: If $G$ is a finite solvable group and $H$ is another group whose subrack lattice is isomorphic to the subrack lattice of $G$, then $H$ is a solvable group and the derived length [1/2 of https://arxiv.org/abs/2503.06714v1]
March 11, 2025 at 6:09 AM
arXiv:2503.06714v1 Announce Type: new
Abstract: We prove the following: If $G$ is a finite solvable group and $H$ is another group whose subrack lattice is isomorphic to the subrack lattice of $G$, then $H$ is a solvable group and the derived length [1/2 of https://arxiv.org/abs/2503.06714v1]
Abstract: We prove the following: If $G$ is a finite solvable group and $H$ is another group whose subrack lattice is isomorphic to the subrack lattice of $G$, then $H$ is a solvable group and the derived length [1/2 of https://arxiv.org/abs/2503.06714v1]
Sel\c{c}uk Kayacan: Subrack lattice determines the derived length https://arxiv.org/abs/2503.06714 https://arxiv.org/pdf/2503.06714 https://arxiv.org/html/2503.06714
March 11, 2025 at 6:09 AM
Sel\c{c}uk Kayacan: Subrack lattice determines the derived length https://arxiv.org/abs/2503.06714 https://arxiv.org/pdf/2503.06714 https://arxiv.org/html/2503.06714
I wonder which one is the chassis controller slot 🤔
June 23, 2025 at 4:34 PM
I wonder which one is the chassis controller slot 🤔
Replaced the samtec HSEC8-140-01-L-PV-4-1-WT's with PCIe x8 connectors,
Sure we get kneecapped on current, only 1/26th of what the samtec parts can supply, but we can still get 55W per slot, So that's 1.7kW per chassis total, which is fine.
Also the PCIe connectors are so much cheaper :v
Sure we get kneecapped on current, only 1/26th of what the samtec parts can supply, but we can still get 55W per slot, So that's 1.7kW per chassis total, which is fine.
Also the PCIe connectors are so much cheaper :v
June 16, 2025 at 8:20 PM
Replaced the samtec HSEC8-140-01-L-PV-4-1-WT's with PCIe x8 connectors,
Sure we get kneecapped on current, only 1/26th of what the samtec parts can supply, but we can still get 55W per slot, So that's 1.7kW per chassis total, which is fine.
Also the PCIe connectors are so much cheaper :v
Sure we get kneecapped on current, only 1/26th of what the samtec parts can supply, but we can still get 55W per slot, So that's 1.7kW per chassis total, which is fine.
Also the PCIe connectors are so much cheaper :v
Mmmm, all happy and aligned :3
June 15, 2025 at 12:20 PM
Mmmm, all happy and aligned :3
Okay, somewhat better.
PSU Position and if the 6U cards are on the right or left are TBD, but I think that would be big enough for a homebrew minicomputer, a whole 6U :v
PSU Position and if the 6U cards are on the right or left are TBD, but I think that would be big enough for a homebrew minicomputer, a whole 6U :v
June 13, 2025 at 4:18 PM
Okay, somewhat better.
PSU Position and if the 6U cards are on the right or left are TBD, but I think that would be big enough for a homebrew minicomputer, a whole 6U :v
PSU Position and if the 6U cards are on the right or left are TBD, but I think that would be big enough for a homebrew minicomputer, a whole 6U :v
I'm also thinking I could use a 19" subrack for this, especially if I can make the cards fit into just a few U we can get quite a few in there.
June 12, 2025 at 4:09 PM
I'm also thinking I could use a 19" subrack for this, especially if I can make the cards fit into just a few U we can get quite a few in there.
The brainworms want me to build something in a subrack chassis,
The urge to build a backplane, and the cards, and all of it, too strong.
The urge to build a backplane, and the cards, and all of it, too strong.
June 6, 2025 at 2:47 AM
The brainworms want me to build something in a subrack chassis,
The urge to build a backplane, and the cards, and all of it, too strong.
The urge to build a backplane, and the cards, and all of it, too strong.
I wish subrack card cages were not so expensive, I have a primal *need* to build in them,
April 23, 2025 at 5:16 AM
I wish subrack card cages were not so expensive, I have a primal *need* to build in them,
also suitable for ambient-temperature applications and general-purpose experiment input and output. It is built around an IEEE Eurocard subrack capable of housing up to 16 interchangeable daughter cards, allowing a fully populated system to support as [2/7 of https://arxiv.org/abs/2505.07986v1]
May 14, 2025 at 6:13 AM
also suitable for ambient-temperature applications and general-purpose experiment input and output. It is built around an IEEE Eurocard subrack capable of housing up to 16 interchangeable daughter cards, allowing a fully populated system to support as [2/7 of https://arxiv.org/abs/2505.07986v1]
Another hefty Vero Electronics Eurocard power supply that pisses all over any Meanwell for #Eurorack use, especially for the £12 it cost!
If you have a deep case you cannot beat these for the prices they often go for. You often find them just thrown in as part of some obsolete lab equipment subrack.
If you have a deep case you cannot beat these for the prices they often go for. You often find them just thrown in as part of some obsolete lab equipment subrack.
April 17, 2025 at 11:48 AM
Another hefty Vero Electronics Eurocard power supply that pisses all over any Meanwell for #Eurorack use, especially for the £12 it cost!
If you have a deep case you cannot beat these for the prices they often go for. You often find them just thrown in as part of some obsolete lab equipment subrack.
If you have a deep case you cannot beat these for the prices they often go for. You often find them just thrown in as part of some obsolete lab equipment subrack.
Further adventures in Eurorack power. VERO electronics Bivolt PK30 bought as part of an obsolete BCD broadcast audio subrack for £10. It probably cost an offensive amount of money when brand new!
110-240v input, +12-15v at 2A, and -12-15v at 1A output. Less than 3mv ripple. 8HP wide but 19cm deep.
110-240v input, +12-15v at 2A, and -12-15v at 1A output. Less than 3mv ripple. 8HP wide but 19cm deep.
October 6, 2023 at 12:13 PM
Further adventures in Eurorack power. VERO electronics Bivolt PK30 bought as part of an obsolete BCD broadcast audio subrack for £10. It probably cost an offensive amount of money when brand new!
110-240v input, +12-15v at 2A, and -12-15v at 1A output. Less than 3mv ripple. 8HP wide but 19cm deep.
110-240v input, +12-15v at 2A, and -12-15v at 1A output. Less than 3mv ripple. 8HP wide but 19cm deep.
My latest subrack invention produces (HD)-SDI from a Raspberry Pi on one small card.
February 10, 2026 at 3:23 PM
My latest subrack invention produces (HD)-SDI from a Raspberry Pi on one small card.
Here's a video looking at my subrack crates and the custom cards that run in them
www.youtube.com/watch?v=jD1S...
www.youtube.com/watch?v=jD1S...
Subracks and Custom Cards
YouTube video by Nathan Dane
www.youtube.com
January 15, 2026 at 2:00 PM
Here's a video looking at my subrack crates and the custom cards that run in them
www.youtube.com/watch?v=jD1S...
www.youtube.com/watch?v=jD1S...
Until fairly recently I used an original 1B for playing stuff to my internal TV channel. Now been replaced by a pi zero on a subrack card, but used for testing stuff.
August 20, 2025 at 2:19 AM
Until fairly recently I used an original 1B for playing stuff to my internal TV channel. Now been replaced by a pi zero on a subrack card, but used for testing stuff.
Subrack is nearly full - will need a few crates at this rate..!
February 21, 2025 at 7:31 PM
Subrack is nearly full - will need a few crates at this rate..!
If you haven't already you should have a look at this dude's vids on his home-built subrack test gear. Very professional finish on his projects.
www.youtube.com/watch?v=21Ui...
www.youtube.com/watch?v=21Ui...
Modular test system: new modules overview and battery tester in detail
YouTube video by Jef Collin
www.youtube.com
December 12, 2024 at 7:31 PM
If you haven't already you should have a look at this dude's vids on his home-built subrack test gear. Very professional finish on his projects.
www.youtube.com/watch?v=21Ui...
www.youtube.com/watch?v=21Ui...
Latest subrack PCB design: this takes 1²S digital audio and converts it to high quality balanced audio. Also analogue video out, of course.
The glued on module is for ethernet, and also PoE.
Next I need to cut out the front panel.
The glued on module is for ethernet, and also PoE.
Next I need to cut out the front panel.
November 15, 2024 at 11:44 PM
Latest subrack PCB design: this takes 1²S digital audio and converts it to high quality balanced audio. Also analogue video out, of course.
The glued on module is for ethernet, and also PoE.
Next I need to cut out the front panel.
The glued on module is for ethernet, and also PoE.
Next I need to cut out the front panel.
That's another three subrack cards finished!
These are video D/As.
SVDA2/A means 'Subracked Video Distribution Amplifier with 2 outputs and an Alarm'.
You can see the alarm in action on the far right card which has no video input.
Working great!
These are video D/As.
SVDA2/A means 'Subracked Video Distribution Amplifier with 2 outputs and an Alarm'.
You can see the alarm in action on the far right card which has no video input.
Working great!
October 24, 2024 at 5:36 PM
That's another three subrack cards finished!
These are video D/As.
SVDA2/A means 'Subracked Video Distribution Amplifier with 2 outputs and an Alarm'.
You can see the alarm in action on the far right card which has no video input.
Working great!
These are video D/As.
SVDA2/A means 'Subracked Video Distribution Amplifier with 2 outputs and an Alarm'.
You can see the alarm in action on the far right card which has no video input.
Working great!
Well as of today Everything has moved into the New Rack, and the old one has been dismantled and removed.
Still plenty to do though, I have several more subrack cards to design and build to replace some gear hehe
Still plenty to do though, I have several more subrack cards to design and build to replace some gear hehe
September 30, 2024 at 9:14 PM
Well as of today Everything has moved into the New Rack, and the old one has been dismantled and removed.
Still plenty to do though, I have several more subrack cards to design and build to replace some gear hehe
Still plenty to do though, I have several more subrack cards to design and build to replace some gear hehe
Really pleased with progress on the new rack.
As you can see, this time I've decided to mount the network switch and patch panel at the back - so there's even more space on the front.
Also the plan is to replace some of my gear with subrack cards, which uses the space even more efficiently.
As you can see, this time I've decided to mount the network switch and patch panel at the back - so there's even more space on the front.
Also the plan is to replace some of my gear with subrack cards, which uses the space even more efficiently.
September 9, 2024 at 12:40 PM
Really pleased with progress on the new rack.
As you can see, this time I've decided to mount the network switch and patch panel at the back - so there's even more space on the front.
Also the plan is to replace some of my gear with subrack cards, which uses the space even more efficiently.
As you can see, this time I've decided to mount the network switch and patch panel at the back - so there's even more space on the front.
Also the plan is to replace some of my gear with subrack cards, which uses the space even more efficiently.