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Circuit signal delay methods

Are you trying to create a 1-sec wide pulse in response to some event, or are you trying to take an arbitrary signal, delay each point on the wavefront by a second, and re-output the signal?
- KilroySmith
- Post #6
- Feb 26, 2003
- Forum: Ask a Technical Professional
K
Circuit signal delay methods

Well, if you were looking for a delay on the order of two and a half seconds, there is a very simple approach. Using a high-power transmitter and high-gain parabolic dish antenna, bounce the signal off a reflector located on the moon (I'm sure there are a few left over from the Apollo days)...
- KilroySmith
- Post #4
- Feb 26, 2003
- Forum: Ask a Technical Professional
K
Caps v. Batteries

dkozloski - OK, good point - with a linear load (a resistor), a theoretical capacitor will show an exponential decay. With a constant-current load, it should give a linear curve. Of course, the supercap I linked shows a constant-current discharge curve that looks remarkably like a Ni-Cd...
- KilroySmith
- Post #13
- Feb 25, 2003
- Forum: Ask a Technical Professional
K
Caps v. Batteries

Not so, young one. A couple of 'D' size Ni-MH cells might give you 16000 mah @ 1.2v. This is equivalent to (16 A-hr * 3600 sec/hr) = 57600 A-secs. Using the relation 1 A = 1 coulomb/sec, we have approximately 57600 coulombs of charge stored at 1.2V (average). Using the relation Farad =...
- KilroySmith
- Post #7
- Feb 24, 2003
- Forum: Ask a Technical Professional
K
Caps v. Batteries

Good try, but some capacitors (electrolytics, for example) will also recover some amount of voltage awhile after a short "should" have drained it. In the real world, there is probably a range of time where a shorted capacitor wouldn't recover, but a battery would. There is no way to determine...
- KilroySmith
- Post #3
- Feb 24, 2003
- Forum: Ask a Technical Professional
K
Caps v. Batteries

OK, after pulling apart my $15 mini-RC car, I had a question that went back to basic electronics: How would you test a two-terminal device to determine whether it was a battery or a capacitor? What physical characteristics differentiate them? - Both are charge storage devices - Both show a...
- KilroySmith
- Thread
- Feb 24, 2003
- Replies: 12
- Forum: Ask a Technical Professional
K
refurb laptop batteries

Gotta get this in before a lock. Well, most of the linked article is horsepucky. Charging circuits are not carefully designed for the impedance of a particular batch of batteries. They are designed for the chemistry involved (Ni-MH v. Li-Ion), for the approximate voltage (read, number of...
- KilroySmith
- Post #5
- Feb 24, 2003
- Forum: Ask a Technical Professional
K
$50 1700+ T-Breds @Newegg

I've run several different Palomino-core XP's on my KK266plus mobo, no problems at all. However, it appears that the Thoroughbred core XP's do NOT work on the kk266 series mobos. I haven't tried one, but I've seen several posts from those who have, and those who've gone over the edge trying to...
- KilroySmith
- Post #14
- Feb 21, 2003
- Forum: Hot Deals and Giveaways
K
AGP Bandwidth on PCI Bus? Need help...

No. If you're not using the devices, they're not creating any I/O, thus not using any bandwidth. /frank
- KilroySmith
- Post #7
- Feb 21, 2003
- Forum: Ask a Technical Professional
K
Electronic circuit design question

Hey guys, relax. It really isn't all that difficult. I built a lot of stuff at a young age with none of the math background you're talking about. Sure, one is limited in the types of circuits one can designed, but you can still have a blast with really, really basic stuff. The best way I...
- KilroySmith
- Post #15
- Feb 14, 2003
- Forum: Ask a Technical Professional
K
AC Adapters: Does heavier = higher quality AC-DC power conversion?

Quick Wall-wart (AC Adapter) overview: Let's take a sample Adapter: one labeled as 5V, 500ma. There is a huge difference between what might be inside different adapters with this same rating. The cheapest wall-warts have a transformer (hunk of metal with lots of fine wire wrapped around it...
- KilroySmith
- Post #8
- Feb 11, 2003
- Forum: Ask a Technical Professional
K
Underwater Oxygen Generator

It's still not clear why liquid Oxygen can't be used diving. My Grandfather-in-law visited last year, he needs oxygen continuously. We had a service deliver a bulk oxygen tank, and he brought his carryable, day-size tank. Neither one used compressed oxygen - both stored liquid oxygen, both...
- KilroySmith
- Post #15
- Jan 9, 2003
- Forum: Ask a Technical Professional
K
Lossless MPEG transcoding

Simple experiment CTho9385 - Encode a song to MP3. Convert back to .WAV. Repeat 3 or 4 times - the degradation in the music quality will indeed be noticeable. This is one of the reasons one wouldn't want to convert up and back down. johnfreezz - "Lossy" means that some of the information in...
- KilroySmith
- Post #5
- Dec 27, 2002
- Forum: Ask a Technical Professional
K
Would this work? (zero-gravity perpetual generator)

Simple experiment: Pick up a small dc motor - like out of a children's toy, or a slot car. Spin the armature (the spinny thing). It'll spin for several seconds as it slows to a halt. Now, short the two wires coming from the motor (or the two power terminals, if there are no wires). Try...
- KilroySmith
- Post #11
- Dec 5, 2002
- Forum: Ask a Technical Professional

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