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Do you want to buy the powersupply kit ?
Posted by
Blue
on 06 Jan, 2012 17:54
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You will see the results after voting.
And you may change your mind after voting.
Please elaborate in this post.
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#1 Reply
Posted by
IanB
on 06 Jan, 2012 18:44
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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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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
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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.
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I don't *need* another supply, but I may build it, just for it to look cool on my bench
, and to support EEVBlog
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#5 Reply
Posted by
Anders
on 07 Jan, 2012 09:34
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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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#6 Reply
Posted by
desowin
on 07 Jan, 2012 13:59
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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?).
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#7 Reply
Posted by
8086
on 07 Jan, 2012 14:25
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Depending on the price, yes. At the moment I only have a college freebie coarse/fine psu with no current limit.
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#8 Reply
Posted by
G7PSK
on 07 Jan, 2012 17:28
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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.
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#9 Reply
Posted by
alm
on 07 Jan, 2012 18:20
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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
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#10 Reply
Posted by
don.r
on 07 Jan, 2012 18:41
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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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#11 Reply
Posted by
Greg J
on 07 Jan, 2012 20:16
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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).
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#12 Reply
Posted by
JuKu
on 07 Jan, 2012 20:53
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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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#13 Reply
Posted by
don.r
on 07 Jan, 2012 20:59
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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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#14 Reply
Posted by
EEVblog
on 07 Jan, 2012 22:42
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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.
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#15 Reply
Posted by
Greg J
on 08 Jan, 2012 00:18
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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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#16 Reply
Posted by
amspire
on 08 Jan, 2012 01:21
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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.
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#17 Reply
Posted by
EEVblog
on 08 Jan, 2012 07:17
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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.
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#18 Reply
Posted by
Rerouter
on 08 Jan, 2012 07:22
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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
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#19 Reply
Posted by
benemorius
on 08 Jan, 2012 08:19
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Dave.
I knew it!
Now I'm
really looking forward to the remaining videos!
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#20 Reply
Posted by
benemorius
on 08 Jan, 2012 08:21
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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.
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#21 Reply
Posted by
G7PSK
on 08 Jan, 2012 21:18
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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.
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#22 Reply
Posted by
rr100
on 09 Jan, 2012 12:27
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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.
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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.
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!
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#24 Reply
Posted by
PStevenson
on 09 Jan, 2012 19:23
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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.