Largest Effective USB Hub for Block Erupters? - page 2.

fractalbc

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Quote from: Photon939 on July 31, 2013, 02:57:46 PM

I modified a Rosewill 7 port hub from Newegg. It came with a 2A adapter which would've only been enough for 3 erupters or so, but I removed the host diode and shorted the DC input diodes. It had four 1A schottky diodes, one on the host side and three on the DC jack. They will be easily overloaded and will burn out or cause problems past 3A of current.

Great picture! Leaves little doubt that the three plugs on the right are one hop away from the input but the four on the left are two hops. Very important if you are going to cascade hubs.

One minor nit. The diodes also protect against hooking up the power backwards. It wouldn't be hard to pigyback a couple of extra 1 amp diodes to increase capacity if one wanted to increase capacity without removing that protection.

flipper

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Quote from: Photon939 on August 01, 2013, 01:17:10 AM

Yes you could certainly do that, but the diodes are mainly so the wall wart supply couldn't backfeed power into your PC's usb port and vice versa. Since I removed the PC power passthrough diode it can't run as an unpowered hub anymore which removes that issue. Also you lose a bit of efficiency from the forward voltage drop of the diodes.

Thank you for the reply. I'm planning on modifying a hub myself soon.

Photon939

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Yes you could certainly do that, but the diodes are mainly so the wall wart supply couldn't backfeed power into your PC's usb port and vice versa. Since I removed the PC power passthrough diode it can't run as an unpowered hub anymore which removes that issue. Also you lose a bit of efficiency from the forward voltage drop of the diodes.

flipper

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Quote from: Photon939 on July 31, 2013, 02:57:46 PM

When modifying USB hubs for higher current capacity, you must open the housing and desolder the passthrough diodes for the USB host and short out the diodes to the PSU input. This will make pretty much any cheapo hub capable of running at full power on all the ports (in theory)

I modified a Rosewill 7 port hub from Newegg. It came with a 2A adapter which would've only been enough for 3 erupters or so, but I removed the host diode and shorted the DC input diodes. It had four 1A schottky diodes, one on the host side and three on the DC jack. They will be easily overloaded and will burn out or cause problems past 3A of current.

After the mod it happily runs four AMUs, a Raspberry pi and a BFL Jalapeno. YMMV, happy hacking.

Good job. Nice to hear the system is working. One question, Instead of shorting out the three diodes, would it not be safer to replace them with 3 amp ones?

ssateneth

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Quote from: miter_myles on July 30, 2013, 07:15:08 PM

Quote from: ssateneth on July 30, 2013, 05:11:02 PM

Quote from: ogrgat on July 30, 2013, 09:24:53 AM

I dont find that list of hubs useful ... there is plenty of cheaper hubs on ebay, .... maybe they can break down but ... everything is made in china

http://www.ebay.com/itm/10-Port-Hi-Speed-USB-2-0-Hub-Power-Adapter-for-PC-Laptop-Black-5V-DC-2A-N4U8-/350840818287?pt=US_USB_Cables_Hubs_Adapters&hash=item51afbe0a6f

0.7 usd/1usb port

Absoloutely not. These are garbage. Only supports 2 USB miners without AC adapter, and 4 miners with AC adapter. If you directly wire in a high current power source, such as a computer power supply to barrel adapter, the most you can expect to work is 4-8. I bought 5 and returns them all for a full refund. Dont bother with these.

What are you using now?

I am using these instead. They work without a hitch and come with a powerful 60 watt power adapter. http://www.juicedsystems.com/product/10-port-usb-3-0-hub/

Photon939

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Activity: 452

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When modifying USB hubs for higher current capacity, you must open the housing and desolder the passthrough diodes for the USB host and short out the diodes to the PSU input. This will make pretty much any cheapo hub capable of running at full power on all the ports (in theory)

I modified a Rosewill 7 port hub from Newegg. It came with a 2A adapter which would've only been enough for 3 erupters or so, but I removed the host diode and shorted the DC input diodes. It had four 1A schottky diodes, one on the host side and three on the DC jack. They will be easily overloaded and will burn out or cause problems past 3A of current.

After the mod it happily runs four AMUs, a Raspberry pi and a BFL Jalapeno. YMMV, happy hacking.

xjack

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Activity: 539

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Quote from: jedimstr on July 30, 2013, 07:57:27 PM

Quote from: tempestb on July 30, 2013, 03:00:35 PM

http://www.ipadcarts.com/solutions/DS-IP-PP16.htm

Or maybe this one if it provided enough oomf...
http://www.ipadcarts.com/solutions/DS-IP-SC-49.htm

All of them are pretty pricey though. Probably better off with multiple Anker USB3 hubs.

That's the 2nd Gen unit of my setup pictured above. It does have enough oomph if you "upgrade" the power supply to something with 35A+ on the 5v. I swapped in an ancient antec on mine.

Their pricing is atrocious. Nothing like fleecing schools.

flipper

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Quote from: tempestb on July 30, 2013, 03:00:35 PM

http://www.ipadcarts.com/solutions/DS-IP-PP16.htm

$915 + shipping. Is that a joke or a typo? Huh

notme

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Quote from: jedimstr on July 30, 2013, 07:57:27 PM

Or maybe this one if it provided enough oomf...
http://www.ipadcarts.com/solutions/DS-IP-SC-49.htm

http://www.ipadcarts.com/images/49-2_%20large.jpg

All of them are pretty pricey though. Probably better off with multiple Anker USB3 hubs.

Pricey indeed, but that 49 port one is the same as I linked above, it's just my picture doesn't have a case. It does have enough power supply, and apparently the guy in the thread I stole that from found it used for way cheaper.

jedimstr

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Quote from: tempestb on July 30, 2013, 03:00:35 PM

http://www.ipadcarts.com/solutions/DS-IP-PP16.htm

I think this one will work better:
http://www.ipadcarts.com/solutions/DS-IP-32SC.htm

Or maybe this one if it provided enough oomf...
http://www.ipadcarts.com/solutions/DS-IP-SC-49.htm

All of them are pretty pricey though. Probably better off with multiple Anker USB3 hubs.

notme

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Quote from: xjack on July 30, 2013, 02:26:19 PM

That auction lists the output - 5V@1A - 1 Amp?!?!?

Once you've purchased it and find it only runs 2 erupters - Please post in the above "list" thread, so that others won't make the same mistake.

Shit, title said 2A... that's terrible.

xjack

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Quote from: philipma1957 on July 30, 2013, 04:40:18 PM

I found a 20 port one I ordered it today. it should have the power needed.

http://usb.brando.com/usb-20-port-hub_p03123c039d015.html the power supply is 20 volt 4.5 amp.

that is 90 watts even if the unit is 70 percent when it converts to 5 volts you get 63 watts..

at 2.7 watts max for a stick you would have to need 54 watts. I am waiting for delivery .

Tested by another member. Undecided

https://bitcointalksearch.org/topic/m.2782948

miter_myles

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Quote from: ssateneth on July 30, 2013, 05:11:02 PM

Quote from: ogrgat on July 30, 2013, 09:24:53 AM

I dont find that list of hubs useful ... there is plenty of cheaper hubs on ebay, .... maybe they can break down but ... everything is made in china

http://www.ebay.com/itm/10-Port-Hi-Speed-USB-2-0-Hub-Power-Adapter-for-PC-Laptop-Black-5V-DC-2A-N4U8-/350840818287?pt=US_USB_Cables_Hubs_Adapters&hash=item51afbe0a6f

0.7 usd/1usb port

Absoloutely not. These are garbage. Only supports 2 USB miners without AC adapter, and 4 miners with AC adapter. If you directly wire in a high current power source, such as a computer power supply to barrel adapter, the most you can expect to work is 4-8. I bought 5 and returns them all for a full refund. Dont bother with these.

What are you using now?

ssateneth

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Quote from: ogrgat on July 30, 2013, 09:24:53 AM

I dont find that list of hubs useful ... there is plenty of cheaper hubs on ebay, .... maybe they can break down but ... everything is made in china

http://www.ebay.com/itm/10-Port-Hi-Speed-USB-2-0-Hub-Power-Adapter-for-PC-Laptop-Black-5V-DC-2A-N4U8-/350840818287?pt=US_USB_Cables_Hubs_Adapters&hash=item51afbe0a6f

0.7 usd/1usb port

Absoloutely not. These are garbage. Only supports 2 USB miners without AC adapter, and 4 miners with AC adapter. If you directly wire in a high current power source, such as a computer power supply to barrel adapter, the most you can expect to work is 4-8. I bought 5 and returns them all for a full refund. Dont bother with these.

batt01

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Quote from: philipma1957 on July 30, 2013, 04:40:18 PM

I found a 20 port one I ordered it today. it should have the power needed.

http://usb.brando.com/usb-20-port-hub_p03123c039d015.html the power supply is 20 volt 4.5 amp.

that is 90 watts even if the unit is 70 percent when it converts to 5 volts you get 63 watts..

at 2.7 watts max for a stick you would have to need 54 watts. I am waiting for delivery .

Let us know how it works out. Will watch this thread.

philipma1957

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'The right to privacy matters'

I found a 20 port one I ordered it today. it should have the power needed.

http://usb.brando.com/usb-20-port-hub_p03123c039d015.html the power supply is 20 volt 4.5 amp.

that is 90 watts even if the unit is 70 percent when it converts to 5 volts you get 63 watts..

at 2.7 watts max for a stick you would have to need 54 watts. I am waiting for delivery .

tempestb

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http://www.ipadcarts.com/solutions/DS-IP-PP16.htm

xjack

hero member

Activity: 539

Merit: 500

That auction lists the output - 5V@1A - 1 Amp?!?!?

Once you've purchased it and find it only runs 2 erupters - Please post in the above "list" thread, so that others won't make the same mistake.

notme

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Activity: 1904

Merit: 1002

Quote from: ogrgat on July 30, 2013, 09:24:53 AM

I dont find that list of hubs useful ... there is plenty of cheaper hubs on ebay, .... maybe they can break down but ... everything is made in china

http://www.ebay.com/itm/10-Port-Hi-Speed-USB-2-0-Hub-Power-Adapter-for-PC-Laptop-Black-5V-DC-2A-N4U8-/350840818287?pt=US_USB_Cables_Hubs_Adapters&hash=item51afbe0a6f

0.7 usd/1usb port

2A@5V means it can only power 3-4 USB Erupters before you blow your power supply.

ogrgat

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I dont find that list of hubs useful ... there is plenty of cheaper hubs on ebay, .... maybe they can break down but ... everything is made in china

http://www.ebay.com/itm/10-Port-Hi-Speed-USB-2-0-Hub-Power-Adapter-for-PC-Laptop-Black-5V-DC-2A-N4U8-/350840818287?pt=US_USB_Cables_Hubs_Adapters&hash=item51afbe0a6f

0.7 usd/1usb port

Topic: Largest Effective USB Hub for Block Erupters? - page 2. (Read 8596 times)