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mmm electronics

 
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Saw this - very cool. (It kind of goes with a blog post, but I'm just sharing the yummy electronic circuit because I think it is really cool. And accurate.)
 
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"Have your timer and eat it too"?
 
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Like times 1000!
 
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Bear, you're old as dirt! Who else would still know that a 555 is a timer?

 
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Jeanne Boyarsky wrote:Saw this - very cool. (It kind of goes with a blog post, but I'm just sharing the yummy electronic circuit because I think it is really cool. And accurate.)



BB Roy of Great Britan Had a Very Good Wife....
 
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i knew, but i got my electronics degree in 1980
 
Bear Bibeault
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Both my degrees are in EE. I should be designing antennas or something like that (but am so glad that I'm not).
 
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Devesh H Rao wrote:

Jeanne Boyarsky wrote:Saw this - very cool. (It kind of goes with a blog post, but I'm just sharing the yummy electronic circuit because I think it is really cool. And accurate.)


BB Roy of Great Britan Had a Very Good Wife....



Can anyone identify the stripe colors on the resistors? If the ones near the top are both Oranage-Yellow-Green-Gold, then that should give the LED a frequency of about 1.4 Hz. (Although the current-limiting resistor seems too big to make the LED visible at all.)

Good to hear about Mr. Roy. I've heard a different, more socially unacceptable mnemonic. Let's just say Miss Violet is of questionable moral character.

 
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1.4 Hz? That's off the bottom of the electromagnetic spectrum, its wavelength is so large. Did you miss out a few orders of magnitude there?
 
Ryan McGuire
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Paul Clapham wrote:1.4 Hz? That's off the bottom of the electromagnetic spectrum, its wavelength is so large. Did you miss out a few orders of magnitude there?



I may well have. I'm having a tough time identifying the color of the multiplier stripe (third from the right) on the two marshmallows/resistors near the top of the pic. Orange-Yellow-Black would make them 34 Ohm, which, if I'm applying the equation correctly, yields a frequency of 14 kHz. If they're Orange-Yellow-Violet, they'd be 340 MOhm, which would give a frequency of 0.0014 Hz, or one blink every 700 seconds or so.

Then again, if this is a demonstration circuit, you may want a frequency that's interesting yet discernible to the naked eye (sans oscope). Anything between .2 and 5 Hz fits the bill IMO.
 
Randall Twede
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and i thought i was the only programmer who migrated from the hardware world
 
Paul Clapham
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Ryan McGuire wrote:

Paul Clapham wrote:1.4 Hz? That's off the bottom of the electromagnetic spectrum, its wavelength is so large. Did you miss out a few orders of magnitude there?

...If they're Orange-Yellow-Violet, they'd be 340 MOhm, which would give a frequency of 0.0014 Hz, or one blink every 700 seconds or so...



Okay, sorry, I misunderstood the "frequency" you were talking about. I was thinking in terms of "500 THz = blue", i.e. the frequency of the light that the LED gives off, not the frequency it blinks at. Obviously I'm not a hardware guy.
 
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Randall Twede wrote:and i thought i was the only programmer who migrated from the hardware world



Don't worry you're not alone bro ;)
 
Devesh H Rao
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Ryan McGuire wrote:

Can anyone identify the stripe colors on the resistors?



I read it as Brown Black Yellow Orange which gives makes it a 100 K with 2% tolerance

 
Ryan McGuire
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Devesh H Rao wrote:
I read it as Brown Black Yellow Orange which gives makes it a 100 K with 2% tolerance



That works out nicely to... what... 5Hz.
 
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Bear Bibeault wrote: I should be designing antennas or something like that (but am so glad that I'm not).



Which means you would be using your Fields course. All of the EE's I know hated Fields
 
Bear Bibeault
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I didn't mind it so much. What I hated, detested, abhorred and loathed, was matrix algebra.
 
Jeanne Boyarsky
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I learned today it came from here. More pics along with how they made it.
 
Randall Twede
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i also hated matrix algebra. it was horrible.
 
Ryan McGuire
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Devesh H Rao wrote:
BB Roy of Great Britan Had a Very Good Wife....



http://xkcd.com/992 - lower left.
 
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There was /is this arithmetic, algebra and I forgot the third (that uses sin, con etc) one I liked the most.
 
Jeanne Boyarsky
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Sachin Patil wrote: I forgot the third (that uses sin, con etc) one I liked the most.


Trigonometry.
 
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Randall Twede wrote:i also hated matrix algebra. it was horrible.



Hah, that's interesting, while I'm not exceptionally good at most math, linear algebra was my favorite and I got really great marks for it XD

Matrices, vectors, eigen-values, I loved it haha.
 
Bear Bibeault
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Stephan van Hulst wrote:Matrices, vectors, eigen-values, I loved it haha.


Well, someone has to like it. Otherwise, who'd work on Photoshop?
 
Sachin Patil
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Jeanne Boyarsky wrote:
Trigonometry.



Yes, that's the one.
 
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