Hobo Jungle
Although Daisy had been named Valedictorian and the outfit for her speech carefully chosen to prove that beauty and brains could indeed mix, she suddenly regretted her choice of attire, her rain-soaked T-shirt now valiantly engaging in the titanic struggle between the tensile strength of cotton and Newton's first law of motion.
More Capacitor Stuff
Andre,
Are you an electrical engineer? You give such good advice it seems that you are.
Jon,
Did you catch what Andre said about using 1.5 V lamps with a 5 V regulator? You need to wire four lamps in series (4x1.5=6V.)
If you wish to wire the lamps in parallel, then you should use an LM317T 1.2 Volt adjustable regulator rather than a 7805 5 Volt regulator.
Now for the capacitor question. Three 15 mA lamps in parallel draw 3x15=45 mA. Four draw 4x15=60 mA. R(3lamps)=V/I=1.5/0.045=33 ohm. R(4lamps)=1.5/0.060=25 ohm.
Three 1.5V, 15 mA lamps, 33 ohms
0.1uf: t=RC=33x0.1=3.3 us
1uf: t=RC=33x1=33 us
10uf: t=RC=33x10=330us
100uf: t=RC=33x100=3,300us=3.3 sec
Three 1.5V, 15 mA lamps, 25 ohms
0.1uf: t=RC=25x0.1=2.5 us
1uf: t=RC=25x1=25 us
10uf: t=RC=25x10=250us
100uf: t=RC=25x100=2,500us=2.5 sec
It looks like 10 uf is the minimum. As Andre said, 100 uf would be better, especially going through switches.
Did anyone catch a math error in my previous post?
One 6V, 25 mA lamp, 240 ohms
0.1uf: t=RC=240x0.1=24 us
1uf: t=RC=240x1=240 us
10uf: t=RC=240x10=2400us=2.4 sec
100uf: t=RC=240x100=24,000us=24 sec
I like math. One can see, just by looking at the math, that there is an advantage to using higher voltage lamps. That is--smaller filter caps may be used.
Are you an electrical engineer? You give such good advice it seems that you are.
Jon,
Did you catch what Andre said about using 1.5 V lamps with a 5 V regulator? You need to wire four lamps in series (4x1.5=6V.)
If you wish to wire the lamps in parallel, then you should use an LM317T 1.2 Volt adjustable regulator rather than a 7805 5 Volt regulator.
Now for the capacitor question. Three 15 mA lamps in parallel draw 3x15=45 mA. Four draw 4x15=60 mA. R(3lamps)=V/I=1.5/0.045=33 ohm. R(4lamps)=1.5/0.060=25 ohm.
Three 1.5V, 15 mA lamps, 33 ohms
0.1uf: t=RC=33x0.1=3.3 us
1uf: t=RC=33x1=33 us
10uf: t=RC=33x10=330us
100uf: t=RC=33x100=3,300us=3.3 sec
Three 1.5V, 15 mA lamps, 25 ohms
0.1uf: t=RC=25x0.1=2.5 us
1uf: t=RC=25x1=25 us
10uf: t=RC=25x10=250us
100uf: t=RC=25x100=2,500us=2.5 sec
It looks like 10 uf is the minimum. As Andre said, 100 uf would be better, especially going through switches.
Did anyone catch a math error in my previous post?
One 6V, 25 mA lamp, 240 ohms
0.1uf: t=RC=240x0.1=24 us
1uf: t=RC=240x1=240 us
10uf: t=RC=240x10=2400us=2.4 sec
100uf: t=RC=240x100=24,000us=24 sec
I like math. One can see, just by looking at the math, that there is an advantage to using higher voltage lamps. That is--smaller filter caps may be used.
----Wayne----
Back when I was growing up, if you didn't start someth'n, there wouldn't be noth'n.
--Merle Haggard
Back when I was growing up, if you didn't start someth'n, there wouldn't be noth'n.
--Merle Haggard
LOL!! Indeed!
Check out the Bulwer-Lytton bad fiction contest. It's a hoot!
http://www.bulwer-lytton.com/
Check out the Bulwer-Lytton bad fiction contest. It's a hoot!
http://www.bulwer-lytton.com/
So now I know where that line "It was a dark and stormy night" comes from.
Keeriste, I thought it was from Mickey Spillane. Always liked the Mike Hammer novels.
"It was a miserable night, pouring rain, and the man was laying half on the sidewalk, half in the street, with a .45caliber bullet hole in the back of his head.
Keeriste, I thought it was from Mickey Spillane. Always liked the Mike Hammer novels.
"It was a miserable night, pouring rain, and the man was laying half on the sidewalk, half in the street, with a .45caliber bullet hole in the back of his head.
If you agree with the Progressives, it's freedom of speech. If you disagree, it's hate speech. There are no alternatives.
Re: More Capacitor Stuff
webenda wrote:Andre,
Are you an electrical engineer? You give such good advice it seems that you are.
No. If I like something I just try to do the the best I can.
Thanks for th info Wayne I hope was usefully to everybody!!
Jon, show pictures of your project.
A.
Jon, we all do. Way she goes. SA count?
Still and gently ringing bell on the M coast.
Still and gently ringing bell on the M coast.
Last edited by Tramp on Thu Jul 12, 2007 7:33 pm, edited 2 times in total.
That a life will be spent gaining inches,
When this distance is read in miles.
When this distance is read in miles.
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