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Are you buying the powersupply kit ?

Yes
No
Perhaps

Author Topic: Do you want to buy the powersupply kit ?  (Read 45136 times)

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Offline Blue

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Do you want to buy the powersupply kit ?
« on: January 06, 2012, 05:54:21 pm »
You will see the results after voting.
And you may change your mind after voting.

Please elaborate in this post.
« Last Edit: January 06, 2012, 05:55:57 pm by Blue »
 

Offline IanB

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Re: Do you want to buy the powersupply kit ?
« Reply #1 on: January 06, 2012, 06:44:20 pm »
I am waiting to see the end of the story. So far it is still incomplete and there are some design decisions I don't yet understand. I am hoping the conclusion of the story will make things clear.
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Offline Short Circuit

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Re: Do you want to buy the powersupply kit ?
« Reply #2 on: January 06, 2012, 07:13:26 pm »
Perhaps. I have some 8 power supplies sitteng around here, so I definitely dont need it,
but if the result is nice enough I might get such kit for EEVblog's sake  :D
 

Offline Nick Gammon

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Re: Do you want to buy the powersupply kit ?
« Reply #3 on: January 06, 2012, 08:07:59 pm »
I would be interested, first to support Dave's attempts to educate people in the fun of electronics.

Second, a precision supply with accurately adjustable voltage and current would be a plus. For me, around the 5V mark would be fine because I am generally testing microcontrollers.

Third, the inbuilt current measurement would help overcome the almost impossibility of buying the uCurrent device, of which the last batch arrived, and sold out, between about midnight and 8 am local time, when I was asleep.

Finally, if necessary, the circuit could be extended (eg. monitoring of the levels via I2C messages), to give data logging capability.
 

Offline The_Penguin

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Re: Do you want to buy the powersupply kit ?
« Reply #4 on: January 06, 2012, 08:35:36 pm »
I don't *need* another supply, but I may build it, just for it to look cool on my bench :) , and to support EEVBlog
 

Offline Anders

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Re: Do you want to buy the powersupply kit ?
« Reply #5 on: January 07, 2012, 09:34:14 am »
Well, to be useful on my bench it would need 0 to 16.5V (or higher) and 1.5A output so I hope a kit will allow this.
If not, there are other ways to support Dave and his well explained and very educational projects and other stuff.
 
No matter what the outcome of this power supply I know I’m learning a lot from it, way to go Dave!  ;)
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Offline desowin

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Re: Do you want to buy the powersupply kit ?
« Reply #6 on: January 07, 2012, 01:59:14 pm »
Voted yes since I don't have any bench power supply yet (so far I have just used the ones available at university)

I guess the integrated current measurement would be quite handy for measuring power consumption of microcontroller based projects (especially since I don't have µCurrent).

I would especially like if the "essentially integrated µCurrent" output would be easily accessible by scope probes so the peak current bursts could be observed (by the way: is it right thing to measure current peak bursts this way?).
« Last Edit: January 07, 2012, 02:04:34 pm by desowin »
 

Offline 8086

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Re: Do you want to buy the powersupply kit ?
« Reply #7 on: January 07, 2012, 02:25:59 pm »
Depending on the price, yes. At the moment I only have a college freebie coarse/fine psu with no current limit.
 

Offline G7PSK

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Re: Do you want to buy the powersupply kit ?
« Reply #8 on: January 07, 2012, 05:28:55 pm »
Depending on costs and cost to get it to UK yes as I don't have a proper power supply at present. One that gave 90 volts at 1 amp would be nice to test larger avr's.
 

alm

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Re: Do you want to buy the powersupply kit ?
« Reply #9 on: January 07, 2012, 06:20:35 pm »
One that gave 90 volts at 1 amp would be nice to test larger avr's.
Good luck getting 90 V from a monolithic voltage regulator. 5 V/1 A from a 90 V/1 A linear supply requires an awful lot of cooling. Plus the AVRs I'm familiar with only go up to 5.5 V or so ;).
 

Offline don.r

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Re: Do you want to buy the powersupply kit ?
« Reply #10 on: January 07, 2012, 06:41:49 pm »
One that gave 90 volts at 1 amp would be nice to test larger avr's.
Good luck getting 90 V from a monolithic voltage regulator. 5 V/1 A from a 90 V/1 A linear supply requires an awful lot of cooling. Plus the AVRs I'm familiar with only go up to 5.5 V or so ;).
Audio/Video Receiver? I really do despise acronyms sometimes...
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Offline Greg J

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Re: Do you want to buy the powersupply kit ?
« Reply #11 on: January 07, 2012, 08:16:00 pm »
I would probably buy one or two, just to support Dave (even tho I support him every month anyway). Providing they'll be more readily available then uCurrent thingie !

But I am going to mod the design before I use it.

One thing for instance is modularisation. Separate uC block from the rest of the power supply.
Because if I want to have two power supplies in one (+ static 5V, 3V3 and 12V outputs - with no current cap) + two regulated one, what do you do ?

To make it modular, it needs to be smaller too - so I need to make it at least partially SMD.
To make at least one of them triggered by an external signal (a useful feature sometimes) - I need to add an relay or something (mosfet, etc).

Perhaps I want to capture and read current output using the uC, I need USB connector. For that, having separate uC board makes a lot of sense, because you can then replace it as you go.

Modular designs FTW !
(and yes, I'm a software engineer).
« Last Edit: January 07, 2012, 08:29:11 pm by Greg J »
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Offline JuKu

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Re: Do you want to buy the powersupply kit ?
« Reply #12 on: January 07, 2012, 08:53:55 pm »
Umm, what kit?

(I'm sorry, but even though the subject is interesting, I don't have time right now to sit through six episodes about power supply designs, 3/4h each.)
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Offline don.r

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Re: Do you want to buy the powersupply kit ?
« Reply #13 on: January 07, 2012, 08:59:17 pm »
Umm, what kit?

(I'm sorry, but even though the subject is interesting, I don't have time right now to sit through six episodes about power supply designs, 3/4h each.)
Dave's making the PSU project into a kit.
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Offline EEVblog

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Re: Do you want to buy the powersupply kit ?
« Reply #14 on: January 07, 2012, 10:42:00 pm »
I would probably buy one or two, just to support Dave (even tho I support him every month anyway). Providing they'll be more readily available then uCurrent thingie !

But I am going to mod the design before I use it.

One thing for instance is modularisation. Separate uC block from the rest of the power supply.
Because if I want to have two power supplies in one (+ static 5V, 3V3 and 12V outputs - with no current cap) + two regulated one, what do you do ?

To make it modular, it needs to be smaller too - so I need to make it at least partially SMD.
To make at least one of them triggered by an external signal (a useful feature sometimes) - I need to add an relay or something (mosfet, etc).

Perhaps I want to capture and read current output using the uC, I need USB connector. For that, having separate uC board makes a lot of sense, because you can then replace it as you go.

Modular designs FTW !

I can't possibly make it all things to all people and I'm not even going to try.
I had a specific goal in mind for this supply when I started, and that's what it's going to be. Catering for everyone's wildest requirements  in a power supply is just not possible.

Dave.
 

Offline Greg J

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Re: Do you want to buy the powersupply kit ?
« Reply #15 on: January 08, 2012, 12:18:40 am »
And by making it an open design you do make it possible for us to at least attempt to tailor it to our needs. Thank you for that !
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Online amspire

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Re: Do you want to buy the powersupply kit ?
« Reply #16 on: January 08, 2012, 01:21:06 am »
I was thinking I don't need another power supply right now, but it struck me how well this would work off a 12V SLA battery. The idea has probably been obvious, but it only just registered with me.

It should be pretty conservative of power, the LT regulator is low dropout, and the current sense resistors could probably could be lowered at the expense of accuracy. So it may be able to output 0 to 10V with only 11V battery voltage.

There is probably a good chance that some kind of 12V battery could be fitted into the case above the PCB. 3AH would probably be plenty, but even 1.2AH would be useable. It could be a pretty handy portable DC power supply, and also as a supply to run of a car cigarette lighter socket.

Richard.
 

Offline EEVblog

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Re: Do you want to buy the powersupply kit ?
« Reply #17 on: January 08, 2012, 07:17:39 am »
I was thinking I don't need another power supply right now, but it struck me how well this would work off a 12V SLA battery. The idea has probably been obvious, but it only just registered with me.

It should be pretty conservative of power, the LT regulator is low dropout, and the current sense resistors could probably could be lowered at the expense of accuracy. So it may be able to output 0 to 10V with only 11V battery voltage.

There is probably a good chance that some kind of 12V battery could be fitted into the case above the PCB. 3AH would probably be plenty, but even 1.2AH would be useable. It could be a pretty handy portable DC power supply, and also as a supply to run of a car cigarette lighter socket.

 ;)

Dave.
 

Online Rerouter

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Re: Do you want to buy the powersupply kit ?
« Reply #18 on: January 08, 2012, 07:22:01 am »
only thing to worry about running off of a lighter socket is the op amps fry at 14V (alternator can float a battery around 15V in some cases)

so just make sure you swap them out or protect them :)
 

Offline benemorius

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Re: Do you want to buy the powersupply kit ?
« Reply #19 on: January 08, 2012, 08:19:15 am »


 ;)

Dave.

I knew it! :D  Now I'm really looking forward to the remaining videos!
 

Offline benemorius

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Re: Do you want to buy the powersupply kit ?
« Reply #20 on: January 08, 2012, 08:21:32 am »
only thing to worry about running off of a lighter socket is the op amps fry at 14V (alternator can float a battery around 15V in some cases)

so just make sure you swap them out or protect them :)

It's a given that good transient protection and regulation is needed in an automotive environment. Never mind a measly 15v - transients can be upwards of 60v. :o
 

Offline G7PSK

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Re: Do you want to buy the powersupply kit ?
« Reply #21 on: January 08, 2012, 09:18:12 pm »
Sorry when I talk about AVR's I tend to mean the field regulators for power alternators what usualy happens is they get replaced and the old ones binned but as they can cost several hundreds of pounds I have wondered about trying to fix them or  those that are not encapsulated in resin at least.
 

Offline rr100

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Re: Do you want to buy the powersupply kit ?
« Reply #22 on: January 09, 2012, 12:27:03 pm »
I would buy one for sure if the price is right. And I don't mean to compete with all the cheap chinese stuff on ebay; but many of us leave on another continent and if it goes up to 200$ with shipping and customs and Dave barely makes it even out of this it's not worth considering.
Maybe some cheap(ish) kit with only the board and the parts that might be hard to source locally (especially if they can be ordered in bulk) would be a good idea. If it's fitting in a cheap-to-ship padded envelope even better.
 

Offline Short Circuit

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Re: Do you want to buy the powersupply kit ?
« Reply #23 on: January 09, 2012, 02:18:28 pm »
It's a given that good transient protection and regulation is needed in an automotive environment. Never mind a measly 15v - transients can be upwards of 60v. :o
And then some, ISO7637-2;
- pulse 1: -75 to -100V
- pulse 2a: +37 to +50V
- pulse 3a: -112 to -150V
- pulse 3b: +75 to +100V
- pulse 5a: +65 to +87V (40-400msec pulse! the infamous loaddump)

that's only the values for 12V systems!
 

Offline PStevenson

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Re: Do you want to buy the powersupply kit ?
« Reply #24 on: January 09, 2012, 07:23:40 pm »

I really want to get one of these beauts, I also want to lay one out for an iTead board to see how shit I am at PCB design compared to Dave.
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