Author Topic: Components you wish existed.  (Read 36986 times)

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Offline Cerebus

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Re: Components you wish existed.
« Reply #100 on: May 19, 2017, 04:50:19 pm »
Top riders can sustain an average of 700 watts at the pedals for an hour under occasional peak performance conditions.

A bit less than 700W. The UCI hour takes around 500 watts average power for an hour and, pretty much by definition, that's the world record for average cycling power output over an hour. The 1972 record of Eddie Merckx has been calculated at 485 W average and that's probably the highest effort attained because, although the record has been broken several times since, the bikes have improved over the same period reducing the actual physical effort required.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Online JPortici

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Re: Components you wish existed.
« Reply #101 on: May 19, 2017, 05:12:02 pm »
I would like a 'perfect' active-synchronous bridge rectifier.  Like four IR11672, but without the external components, in a standard bridge rectifier footprint.

And a similar part for low voltage, perhaps integrated with a switching buck/boost regulator.  That would allow using any power brick up to 24VAC with small gadgets.

something like... http://www.mouser.it/new/Fairchild-Semiconductor/fairchild-greenbridge-solutions/
?
 

Offline timgiles

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Re: Components you wish existed.
« Reply #102 on: May 19, 2017, 05:38:25 pm »
A real working 800% batteriser!
 

Online BrianHG

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Re: Components you wish existed.
« Reply #103 on: May 19, 2017, 06:35:44 pm »
Top riders can sustain an average of 700 watts at the pedals for an hour under occasional peak performance conditions.

A bit less than 700W. The UCI hour takes around 500 watts average power for an hour and, pretty much by definition, that's the world record for average cycling power output over an hour. The 1972 record of Eddie Merckx has been calculated at 485 W average and that's probably the highest effort attained because, although the record has been broken several times since, the bikes have improved over the same period reducing the actual physical effort required.

You are correct, the reported 700watts I saw was for 1h and 25min, not 1 hour.  As for the extra power on the generator, without a flywheel, the generator needs to withstand the 2 heavy torque strokes in the pedaling cadence at lower RMP without fail, otherwise the rider will get a slip, like when a stepper motor skips.  Just having heavier magnets and a slightly larger diameter which comes with a more powerful generator will also add to the mechanical flywheel effect as well.

Note, we are talking power at the pedals, not power transmitted to the road after all the mechanical gears/bearings/wheels...
« Last Edit: May 19, 2017, 06:39:11 pm by BrianHG »
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Offline Housedad

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Re: Components you wish existed.
« Reply #104 on: May 19, 2017, 07:00:03 pm »
Fluxcapacitor

But where are you gonna get the 1.21 gigawatts of electricity?!
Actually, if you only need to hold that wattage for a second, then it's not that bad.  If you need to dish out that total power in one second, then you got some real problems.

Unfortunately they sort of glossed over those details in the movie.

One thing I've always wanted to know is how did he fit a nuclear power plant into a car? It would have been more believable if the flux capacitor was based on nuclear fission directly rather than electricity.
It was a fusion device, not fission. The name on the side of the unit said "Mister Fusion". 
« Last Edit: May 19, 2017, 07:02:03 pm by Housedad »
At least I'm still older than my test equipment
 

Offline Cerebus

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Re: Components you wish existed.
« Reply #105 on: May 19, 2017, 07:07:43 pm »
You are correct, the reported 700watts I saw was for 1h and 25min, not 1 hour. 

Still something very wrong about that figure. That's a higher power output figure for a longer period, which common sense (and your aching legs) tells you is not the way that human endurance works. I think someone's quoted you figures for peak power output during a 1h 25m race, which I can believe, for an all out sprint in the final 200 metres of a race.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Online helius

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Re: Components you wish existed.
« Reply #106 on: May 19, 2017, 07:20:20 pm »
It was a fusion device, not fission. The name on the side of the unit said "Mister Fusion". 
That was the version of the car that came back from 2015. The 1985 version ran on plutonium: that's why Doc had to make a bargain with the terrorists!
 

Online BrianHG

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Re: Components you wish existed.
« Reply #107 on: May 19, 2017, 08:31:55 pm »
You are correct, the reported 700watts I saw was for 1h and 25min, not 1 hour. 

Still something very wrong about that figure. That's a higher power output figure for a longer period, which common sense (and your aching legs) tells you is not the way that human endurance works. I think someone's quoted you figures for peak power output during a 1h 25m race, which I can believe, for an all out sprint in the final 200 metres of a race.
Hmmmm, that would be average 495watts/hour at an hour and 25 minutes, measured with Powertap P1 Powermeter Pedals which have a +/- 2% error rating.  I'm going to have to find the original supplied log posting as I am nowhere near this figure (my record when my back was better was 225 watts at 1h, 40min, however, that was surplus wattage measured coming from a treadmill motor linked to a stationary exercise bike by a rubber belt as a generator & halogen lamps as a load).  I know sustaining a perfect 408 watts for 1 hour straight is considered a typical minimum capability for TDF grade racers.

NOTE: This is an old image before the control board circuitry and PC control logging, but, you get the idea...
« Last Edit: May 19, 2017, 08:39:11 pm by BrianHG »
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Offline Cerebus

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Re: Components you wish existed.
« Reply #108 on: May 19, 2017, 09:23:45 pm »

Hmmmm, that would be average 495watts/hour at an hour and 25 minutes, ...

There's your problem. I don't think you understand what Watts are, which I'd kind of assumed you did given where you're posting, which consequently is why this was getting so confusing. 

Watts are the rate of expenditure of energy, also known as power; Watts = Joules per second, so Watts/hour is a meaningless unit (in this context). Watts are a measure of instantaneous energy expenditure, they don't accumulate over time, which seems to be your understanding from your roughly equating 700W over 1h 25m with 500W over 1h. A power of 700W expended over 1h 25m is a total energy expenditure of 3.57 megajoules, 500W over 1h is 1.8 MJ.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline PointyOintment

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Re: Components you wish existed.
« Reply #109 on: May 22, 2017, 12:05:53 am »
I was going to say a composite video ADC, but there are many. For some reason, last time I looked, it seemed there was only a single such device on the market (which I could hardly believe, but I couldn't find any others).

Offline PointyOintment

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Re: Components you wish existed.
« Reply #110 on: May 22, 2017, 02:09:16 am »
VCCap = voltage controlled capacitance

I'll give you something even better: Digi-Key -> ICs -> Specialized ICs -> Type column: Digital Capacitor. Unfortunately the IXYS datasheets are secret and all of the other manufacturers' parts are obsolete.

There's also an Electronically Trimmable Capacitor entry, though I didn't look at those.

(edited because the forum doesn't support Unicode |O)
« Last Edit: May 22, 2017, 02:18:26 am by PointyOintment »
 

Online BrianHG

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Re: Components you wish existed.
« Reply #111 on: May 22, 2017, 03:05:07 am »
Self aware MCU.
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Offline blueskull

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Re: Components you wish existed.
« Reply #112 on: May 22, 2017, 03:13:38 am »
 

Offline David Chamberlain

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Re: Components you wish existed.
« Reply #113 on: May 22, 2017, 05:30:51 pm »
I'll put a second vote in for a cpld or self booting fpga with on board flash with lower pin count then what is available. Lots of glue logic and other simple stuff could be done with a device with 16 io but more cells. I guess that kind of product only interests hoists like me.
 

Online BrianHG

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Re: Components you wish existed.
« Reply #114 on: May 22, 2017, 05:38:46 pm »
A random number generator which matches the results of the next lottery draw here in Canada.
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Offline schmitt trigger

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Re: Components you wish existed.
« Reply #115 on: May 23, 2017, 12:38:06 am »
A fully complementary pair for the 6L6 vacuum tube.  ;D

 

Offline schmitt trigger

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Re: Components you wish existed.
« Reply #116 on: May 23, 2017, 12:52:52 am »
And while we are at it, a ferrite power material with Bsat of 1.5 Tesla, and usable to at least 100Khz.
 

Online Ian.M

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Re: Components you wish existed.
« Reply #117 on: May 23, 2017, 12:56:39 am »
A fully complementary pair for the 6L6 vacuum tube.  ;D
I wouldn't want to be within a couple of hundred miles of a compliment to a 6L6 tube - if the envelope cracks and air gets at the antimatter electrodes, it will make the Hiroshima bomb look like a firecracker.
 

Offline NivagSwerdna

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Re: Components you wish existed.
« Reply #118 on: May 23, 2017, 10:08:14 am »
here's hoping

A reasonably priced portable multimeter (capable of uA measurement) that contains an inbuilt datalogger for subsequent analysis.
 

Offline Circlotron

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Re: Components you wish existed.
« Reply #119 on: May 23, 2017, 12:27:09 pm »
A fully complementary pair for the 6L6 vacuum tube.  ;D
I wouldn't want to be within a couple of hundred miles of a compliment to a 6L6 tube - if the envelope cracks and air gets at the antimatter electrodes, it will make the Hiroshima bomb look like a firecracker.
What's wrong with "hello 6L6, you're looking smart today!"?
A full complement may well be dangerous, as you say.
 
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Offline AndyC_772

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Re: Components you wish existed.
« Reply #120 on: May 23, 2017, 01:14:27 pm »
A reasonably priced portable multimeter (capable of uA measurement) that contains an inbuilt datalogger for subsequent analysis.
Fluke 289? Depends on your definition of 'reasonably priced', I guess. Mine cost much less than the value of the job I needed it for, so it definitely met that criterion.
 

Offline NivagSwerdna

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Re: Components you wish existed.
« Reply #121 on: May 23, 2017, 02:22:53 pm »
A reasonably priced portable multimeter (capable of uA measurement) that contains an inbuilt datalogger for subsequent analysis.
Fluke 289? Depends on your definition of 'reasonably priced', I guess. Mine cost much less than the value of the job I needed it for, so it definitely met that criterion.
That looks nice, but expensive by my definition of reasonably priced... but I concede my definition won't apply to all.  <£300 is my definition.
 

Offline David Hess

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Re: Components you wish existed.
« Reply #122 on: May 23, 2017, 03:05:40 pm »
1. A variety of monolithic matched transistor arrays.
2. Monolithic cross coupled quads - these are used for when you need real precision.
3. LCC and PLCC (J-*leaded*) parts including microcontrollers, programmable logic, and memory - these can be surface mounted or placed in sockets for through hole designs.
4. CdS cells - Is there really a problem with hermetically sealed CdS?
 

Offline e100

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Re: Components you wish existed.
« Reply #123 on: May 23, 2017, 03:28:50 pm »
Multimeter with a voice output so you don't have to look at the display.
Alternatively a multimeter with a remote display like the one on the "Google glass" glasses.
 

Offline schmitt trigger

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Re: Components you wish existed.
« Reply #124 on: May 23, 2017, 04:21:18 pm »
You know, this is actually a pretty good idea.

With the freakingly small components, in which one struggles to exactly position a needle pointed probe into whatever is exposed in a leadless component, I have had someone helping me reading out out loud the DMM readings.
 


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