Search found 2856 matches

by haklesup
Tue Jun 08, 2004 12:41 pm
Forum: General Discussion
Topic: Ignition Noise
Replies: 10
Views: 1799

Re: Ignition Noise

It is a ground loop. THe head unit and your amp are grounded at different points of the chassis. tiny differences in the actual potental of ground between the two points is what you are hearing. This would not normally be a problem except that the shield in the line level cable (RCA jacks) is often ...
by haklesup
Mon Jun 07, 2004 5:19 pm
Forum: General Discussion
Topic: With all this talk...
Replies: 4
Views: 858

Re: With all this talk...

If your battery charger were equivelent to your power supply with respect to efficiency then there would still be an additional loss due to the battery's internal resistance during charge and discharge (yes they do get warm).<p>Where I live, you pay one electric rate all day long. Only the power com...
by haklesup
Mon Jun 07, 2004 12:14 pm
Forum: General Discussion
Topic: Need Ideas for College Project
Replies: 3
Views: 804

Re: Need Ideas for College Project

If you don't want to mess with batteries, a wall wart style transformer will do just fine. They come in AC and DC and a variety of voltages so check the specs printed or embossed on the side.<p>Almost any DC voltage less than 12V and more than 5V will work if all you want to do is light some LEDs. O...
by haklesup
Fri Jun 04, 2004 2:08 pm
Forum: General Discussion
Topic: OPNIONS WANTED sounds too good to be true
Replies: 80
Views: 16708

Re: OPNIONS WANTED sounds too good to be true

OK, This guy is just a "Dealer" of the promised equipment. If you click on the link to the parent company "United Community Services of America" (sounds like a charity to me) in his FAQ the link is bad but searching on Google for the same turned up several more dealers.<p>This one http://www.ucsofa....
by haklesup
Fri Jun 04, 2004 11:41 am
Forum: General Discussion
Topic: Long Interval Clock and/or Timer Needed
Replies: 7
Views: 1797

Re: Long Interval Clock and/or Timer Needed

A cheap PDA would have the calendar alarm function you need. I've seen the Palm III's going relatively cheap lately and toy-like models going for practically nothing. Not sure about the sustained alarm mode though because I don't own one.<p>You could tape it to the fridge and use it to remind you of...
by haklesup
Thu Jun 03, 2004 6:26 pm
Forum: General Discussion
Topic: May Issue N&V
Replies: 2
Views: 700

Re: May Issue N&V

just send an email to the subscription dept and they will mail you one if it was missed. See the main website for the address. I heard they had some "system problems" I just got May and June mailed to me.
by haklesup
Thu Jun 03, 2004 6:22 pm
Forum: General Discussion
Topic: Kite Camera Shutter Trigger
Replies: 11
Views: 2631

Re: Kite Camera Shutter Trigger

As I understand it, A kite can lift quite a bit also. I've heard of military reconnasance models that can lift a man (not that they do, but they can)<p>Tie a weight to the end of the string and see how much force you can muster, I bet it is at least 5-10 pounds even for a toy kite. I see balancing t...
by haklesup
Thu Jun 03, 2004 2:55 pm
Forum: General Discussion
Topic: OPNIONS WANTED sounds too good to be true
Replies: 80
Views: 16708

Re: OPNIONS WANTED sounds too good to be true

I thought the Dot Com model of making money by giving away your product was prooved wrong years ago.<p>This guy should be arrested for violating the laws of thermodynamics. It's not quite a perpetual motion machine, more like cold fusion. Put a small voltage in and get big power out, that was the ba...
by haklesup
Thu Jun 03, 2004 2:26 pm
Forum: General Discussion
Topic: DC to AC with a twist...
Replies: 15
Views: 2848

Re: DC to AC with a twist...

Given your restrictions, a regular Air conditioner is probably not the best choice. I say this in part due to the incompatible power considerations and partly due to the difficulty venting the hot side of the A/C.<p>A swamp (evaporative)cooler is probably the best way to cool yourself off. www.swamp...
by haklesup
Wed Jun 02, 2004 4:40 pm
Forum: General Discussion
Topic: Kite Camera Shutter Trigger
Replies: 11
Views: 2631

Re: Kite Camera Shutter Trigger

Melting ice, Spring loaded trigger arms. I think you might be a fan of Rube Goldberg machines also (A.K.A Kinetic Art). A design worthy of Wyle Coyote (of Road Runner fame)<p>The coil spring winder is not that original. It was a feature on some old instamatic (110 or 126 cartrage film) cameras.<p>Ic...
by haklesup
Tue Jun 01, 2004 5:31 pm
Forum: General Discussion
Topic: Relay Specs
Replies: 3
Views: 830

Relay Specs

If you look closely at the spec sheet for a relay, you might find a spec for Minimum Switching Capacity, which in the case of the one I am looking at is 100uA, 100mV.<p>Surely a closed relay can have smaller currents through and smaller voltage across it (I do this all the time). So I am having trou...
by haklesup
Tue Jun 01, 2004 5:25 pm
Forum: General Discussion
Topic: Free Tektronix &Fluke manuals
Replies: 2
Views: 997

Re: Free Tektronix &Fluke manuals

You may be able to sell at least some of those on eBay. Particularly the Scope manuals. I see manuals for this type of thing on there all the time. Can't speak for how well they sell though. And, you WILL have an answer in 7 days flat.
by haklesup
Tue Jun 01, 2004 5:14 pm
Forum: General Discussion
Topic: DC to AC with a twist...
Replies: 15
Views: 2848

Re: DC to AC with a twist...

As I understand it, a Deisel-Electric Locomotive has current to burn. I have no idea what voltage the motors that turn the wheels run at ( a good guess is 74V) but the current must be in the hundreds of amps to get the kind of traction those things put out.<p>Though terribly inefficient (for cooling...
by haklesup
Tue Jun 01, 2004 4:27 pm
Forum: General Discussion
Topic: Kite Camera Shutter Trigger
Replies: 11
Views: 2631

Re: Kite Camera Shutter Trigger

A single shot using the RC servo seems like the easiest first try. Put an eccentric cam on the servo shaft such that when it rotates, the wide part of the cam presses on the shutter button.<p>Winding will me more difficult since the torque on the winding knob can be pretty high, I doubt an RC servo ...
by haklesup
Fri May 28, 2004 12:01 pm
Forum: General Discussion
Topic: Hand Crank Generator.
Replies: 9
Views: 1817

Re: Hand Crank Generator.

"I've been given to understand that generally a cap is a cap is a cap."<p>Only on paper. The "memory caps" recommended only have a voltage rating of about 5V or less. Put that in your car at 12V and you get smoke. The big caps used for cars are very expensive. I'm sure he dosen't want a $100 generat...