What multi power supply will do 18v 300ma?

TimmyO

Do we know of a pedalboard power supply that will do 18v 300ma as well as other isolated outputs ofllfor more regular pedals? 

Pablocrackers

Strymon zuma will give you 250ma at 18v if that works for you some pedals say 300ma but run fine on 250 

TimmyO

Am I right in thinking that one of these

https://www.andertons.co.uk/voodoo-labs-18v-y-cable-for-combining-outputs-on-pedal-power-packs-vlppy?LGWCODE=VLPPY;56375;6335&gclid=Cj0KCQiA-c_iBRChARIsAGCOpB0EH-6m4_AugZM8V6bwMN9kvZkhNoL_VKIpkEM4kQQ3RxPvviHD9mAaAq9_EALw_wcB

and 2 isolated 9v outputs will get me 18v at the current rating of one of the 9v outputs? 

robinbowes

TimmyO said:

Do we know of a pedalboard power supply that will do 18v 300ma as well as other isolated outputs ofllfor more regular pedals? 

The GigRig doubler high-current adapter does exactly that. You can connect it to the 9v outlet (needs 150mA correction: 600mA) of most power supplies and get 18v @ 300mA.

R.

Edit: @ICBM pointed out I had the calculation the wrong way around.

TimmyO

robinbowes said:

TimmyO said:

Do we know of a pedalboard power supply that will do 18v 300ma as well as other isolated outputs ofllfor more regular pedals? 

The GigRig doubler high-current adapter does exactly that. You can connect it to the 9v outlet (needs 150mA) of most power supplies and get 18v @ 300mA.

R.

I'd forgotten about those - I had one some years back. iirc though it needs to pull more current than that

robinbowes

TimmyO said:

robinbowes said:

TimmyO said:

Do we know of a pedalboard power supply that will do 18v 300ma as well as other isolated outputs ofllfor more regular pedals? 

The GigRig doubler high-current adapter does exactly that. You can connect it to the 9v outlet (needs 150mA correction: 600mA)  of most power supplies and get 18v @ 300mA.

R.

I'd forgotten about those - I had one some years back. iirc though it needs to pull more current than that

It might need slightly more 9V current (maybe 180-200mA correction 650-750mA) depending on how efficient it is.

R.

ICBM

300mA at 18V will require 600mA at 9V, or you’ve just bypassed the laws of physics.

Power = voltage x current, and you can’t get more power out than you put in.

robinbowes

ICBM said:

300mA at 18V will require 600mA at 9V, or you’ve just bypassed the laws of physics.

Doh - brainfart. I did the calculation the wrong way round. I blame the pub

R.

TimmyO

ICBM said:

300mA at 18V will require 600mA at 9V, or you’ve just bypassed the laws of physics.

Power = voltage x current, and you can’t get more power out than you put in.

That's for the gigeig doohickey right?

A series cable adapter would let 2 9v 300ma outlets double to 18v 300ma though? 

ICBM

TimmyO said:

A series cable adapter would let 2 9v 300ma outlets double to 18v 300ma though? 

Yes.

Wazmeister

The Strymon Ojai and Zuma are silent and superb

ThorpyFX

What pedal is it for? Often these figures needed are higher than what is actually required. Sometimes it’s only the current on first startup that gets close to the quoted figure and even then there is a safety margin. So typically a quoted 300mA requirement actually is closer to 250mA on startup and then can idle closer to 180-200mA

lukedlb

Although Gigrig states 300mA, they recommend double the stated requirement. For example I have an old supa nova to power a neo ventilator a single unit does not supply enough mA, even though the mA would appear sufficient, and so I have two wired up (I think the modern ones supply more). 
A pedal tech built me a small 18v supply with a large mA to use with my Gigrig power system. 
Why is the mA supply low on many isolated power supply systems? The effectrode power supply is the only high mA isolated I know. I’ve had my fair share of 500mA pedals too so why aren’t there more on the market?

TimmyO

ThorpyFX said:

What pedal is it for? Often these figures needed are higher than what is actually required. Sometimes it’s only the current on first startup that gets close to the quoted figure and even then there is a safety margin. So typically a quoted 300mA requirement actually is closer to 250mA on startup and then can idle closer to 180-200mA

It's something I'm considering buying - but I have managed to find one reference to it working on a 250ma rated supply, Soni think I'll use an inexpensive nseries cable and combine 2 9v 259ma outputs i have and test it with that before choosing a permanent power solution - thanks for the pointer 

RaymondLin

Cioks Ciokolate has 9v at 600mA so use a voltage doubler and it’ll work.

TimmyO

I think people Forget that charge pumps (voltage doublers) consume current themselves. So it *might* work  

RaymondLin

TimmyO said:

I think people Forget that charge pumps (voltage doublers) consume current themselves. So it *might* work  

Put 2 x 9v 400ma together and then double the voltage? 

Can you do that?  Then you will definitely have more than 300mA

TimmyO

RaymondLin said:

TimmyO said:

I think people Forget that charge pumps (voltage doublers) consume current themselves. So it *might* work  

Put 2 x 9v 400ma together and then double the voltage? 

Can you do that?  Then you will definitely have more than 300mA

yep - a serial cable (which has no active circuitry so doesn't draw any current) and 2 of those outputs would achieve 18v at 400ma 

TimmyO

It seems happy on 18v 250ma - serial adapter on my little Cioks (although I’ll need a longer term solution as that only leaves me with 2 other outputs and I may need more - but not much) 

https://imgur.com/a/rdeM3Md