cast the first stone
"Allthough I'm tired of the spelling problem in the title of this thread (I'm a teacher!), I'm very satisfied with the interesse shown to this issue.
Administrators - could the title be corrected?"
I would have an interesse in correcting the spelling problem as well.
"Allthough I'm tired of the spelling problem in the title of this thread (I'm a teacher!), I'm very satisfied with the interesse shown to this issue.
Administrators - could the title be corrected?"
I would have an interesse in correcting the spelling problem as well.
Method to the Madness
Hi All,
This forum gets more interesting by the minute, as long as the sun keeps shining. 🙄 -🙄 -🙄
Hi All,
This forum gets more interesting by the minute, as long as the sun keeps shining. 🙄 -🙄 -🙄
Normally, I ignore spelling since most members' English skills are much better than my abilities in Dutch or Danish or Tagalog or whatever. But to make medum happy, I added the missing "a".
This all reminds me of my design for a fusion powered clock.
This all reminds me of my design for a fusion powered clock.
To run anything powered by solar power, efficiency sure becomes an issue. We are not talking BOSOZ or the like.
¨
Wich circuits do you guys have in mind?
I have found some 7.5V solar chips that ive been playing around with for a while, but again efficiency is an issue. 1mA is all of a sudden a big unit!!
Magura🙂
¨
Wich circuits do you guys have in mind?
I have found some 7.5V solar chips that ive been playing around with for a while, but again efficiency is an issue. 1mA is all of a sudden a big unit!!
Magura🙂
SY said:
Thanks, SY - happines is a warm gun! according to Mr. Lennon.
For me being able to recognize an english spelling problem almost makes my day!
Bending to the dust
If you come by, you can have a scotch (Oban - 14 year - bought directly at the destillery this summer)
You ARE making a joke at the ending of your reply, right?
- please be kind to a newbie!
I'll try not to be off-topic anymore, but I won't promise
Jørn
A solar powered flaslight shining on a solar cell might work
??????Something looks wrong here!!!!!!????
See if I can figure what it is and get back with you.
Don't hold your breath though.
Sam
??????Something looks wrong here!!!!!!????
See if I can figure what it is and get back with you.
Don't hold your breath though.
Sam
The solar-powered MC stage sounds like an absolutely great idea. With only the minor reservation that a very low current source, even in a situation where the current draw is low (1-2mA) will probably sound not very powerful. How possible is it to get 20-30mA max current at 8-10v? Is efficiency around 1-2%?
Bear in mind that any variation in the light will show up as a variation in the output of the solar cell. I once did a rough bandwidth test on a solar cell and found it to be far wider than I'd expected. Sorry, don't remember the actual figure--this was years ago. It might not be a bad idea to use caps to shunt high frequency noise and such to ground.
Dust falling through the light beam is to be avoided.
This begs the question: How good is the power supply for those light bulbs? Now, the filament is going to smooth out some of the higher frequency trash, just by...what shall I call it, thermal inertia? Once the filament's hot, it will remain hot for a finite amount of time, even if the power drops entirely. A sort of low pass function, at any rate.
But...
If you want to get neurotic about it, the light bulbs will also inject noise, just by the random nature of the heated molecules. Thermal noise can be a booger to deal with. Ask any tube guy. Again, caps (at least, and perhaps a regulator) are indicated.
The sun? Definitely going to need caps. Else what will you do when a cloud drops your output voltage to 10% of design value? Yes, you could use solar cells to charge batteries, but then you're flipping coins as to whether AC or solar is better for the environment, because it'll be the batteries that you're actually working with.
For some reason, I'm thinking that they've got solar cells up into the teens of percent efficiency now, with the very best ones up into the twenties. Can't remember where I read that, so I may be wrong.
Grey
Dust falling through the light beam is to be avoided.
This begs the question: How good is the power supply for those light bulbs? Now, the filament is going to smooth out some of the higher frequency trash, just by...what shall I call it, thermal inertia? Once the filament's hot, it will remain hot for a finite amount of time, even if the power drops entirely. A sort of low pass function, at any rate.
But...
If you want to get neurotic about it, the light bulbs will also inject noise, just by the random nature of the heated molecules. Thermal noise can be a booger to deal with. Ask any tube guy. Again, caps (at least, and perhaps a regulator) are indicated.
The sun? Definitely going to need caps. Else what will you do when a cloud drops your output voltage to 10% of design value? Yes, you could use solar cells to charge batteries, but then you're flipping coins as to whether AC or solar is better for the environment, because it'll be the batteries that you're actually working with.
For some reason, I'm thinking that they've got solar cells up into the teens of percent efficiency now, with the very best ones up into the twenties. Can't remember where I read that, so I may be wrong.
Grey
I saw the light.
"I once did a rough bandwidth test on a solar cell and found it to be far wider than I'd expected. Sorry, don't remember the actual figure--this was years ago."
"I once did a rough bandwidth test on a solar cell and found it to be far wider than I'd expected. Sorry, don't remember the actual figure--this was years ago."
Sorry, just got back from vacationing in a parallel universe while my evil twin took my place here.
What's this I hear about Fred agreeing with me?
se
What's this I hear about Fred agreeing with me?
se
I saw the light. No more darkness, no more night
And no measurements it seems...................
"I once did a rough bandwidth test on a solar cell and found it to be far wider than I'd expected. Sorry, don't remember the actual figure--this was years ago."
You sound like a politician giving a deposition. 😕
The bandwidth of what exactly........ Did you vary the frequency of the light? Did the dog eat your note book for this one also? How big a cap should one put across a solar cell? What is their impedance and how does it vary with light intensity? Does the voltage drop with light intensity? I guess all that info was in the note book......... have you even considered putting some of all this data you collect on the computer where you can find it again someday.
Why not go to Radio Shack and buy one and actually measure something before posting vague and unverifiable advice.
And no measurements it seems...................
"I once did a rough bandwidth test on a solar cell and found it to be far wider than I'd expected. Sorry, don't remember the actual figure--this was years ago."
You sound like a politician giving a deposition. 😕
The bandwidth of what exactly........ Did you vary the frequency of the light? Did the dog eat your note book for this one also? How big a cap should one put across a solar cell? What is their impedance and how does it vary with light intensity? Does the voltage drop with light intensity? I guess all that info was in the note book......... have you even considered putting some of all this data you collect on the computer where you can find it again someday.
Why not go to Radio Shack and buy one and actually measure something before posting vague and unverifiable advice.
jam said:
Nah, it's getting a bit nippy down here in Hell, but don't see any flakes just yet. 🙂
se
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