Search found 87 matches

by Craig
Wed Jul 02, 2008 11:55 am
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

Thanks for the info. I will look into these options, and probably order some samples of these IC's to check them out. I tried my local supplier and they don't have any of them, other than the LM350. Would I need a heatsink for the LM350? Also, the bridge rectifier that I bought has a metel top to it...
by Craig
Tue Jul 01, 2008 8:21 am
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

The best choice is a switching regulator, built from a Simple Switcher IC chip available from National Semiconductor, or another type of switcher chip. This sound like a good idea, however, I have looked and looked for a 20-24 volt, 3 amp+ voltage regulator but have been unable to find one. Do you ...
by Craig
Mon Jun 30, 2008 5:00 am
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

Using a voltage diveder circuit

Hi, The transformer I have puts out either 24 or 12 volts AC, which translates into 16 or 36 volts DC. Since the train requires (or can handle) up to 24 volts, I figure I need to wire up the transformer to output 36 volts, then use a voltage divider curcuit to get the voltage down lower. What I deci...
by Craig
Wed Jun 25, 2008 12:08 pm
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

No, I am not going to build a controller, my dad already has two of them that work just fine. The power supply will only be taken outside when the train is going to be used, it won't stay outside (as far as I know anyways). Yes, the tracks get dirty and need to be cleaned. They actually have special...
by Craig
Mon Jun 23, 2008 2:49 pm
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

Here's the train layout.


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by Craig
Mon Jun 23, 2008 2:40 pm
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

Here are some pictures of the power supply. As stated earlier, the power supply isn't quite finished, I still need to fasten down the transformer and clean up and heat shrink some of the wires. http://www.postimage.org/gx14grj0.jpg http://www.postimage.org/gx14gDMJ.jpg http://www.postimage.org/gx14g...
by Craig
Mon Jun 23, 2008 10:21 am
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

Hi guys. I tried the train out on the weekend using my 0-30 volt, 3 amp test bench power supply hooked to the ArtisoCraft controller that I mentioned earlier. I ran it at 12 volts, and the train was very slow. I then bumped it up to 16 volts, and it was still somewhat slow. It brought it up to 20 vo...
by Craig
Wed Jun 18, 2008 1:16 pm
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

The specs that I posted were copied from the website of the product that I want to power. I don't need to build something to those specs, I need to build something that will power a device with those specs. I just picked up a GBPC2502 25 amp bridge rectifier. I will try to put it together tonight or...
by Craig
Wed Jun 18, 2008 10:47 am
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

Thanks for the info. How do I setup a bridge rectifier? Is this a single component piece that I can go buy, or do I have to make one myself? What parts would you recommend? I posted this before I saw the previous post. Again, thanks for the info, I will go to my local electronics store to see if I c...
by Craig
Wed Jun 18, 2008 9:27 am
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

I agree with you gerty. It's a very basic setup, and the train is just going in a circle. Sghioto, here are the details of the controllers: Input: 16 V DC Train Output (DC): 0-21 V Train Current: 20VA Accessory Output (DC): 15 V Accessory Current: 7 VA Total Output: 22 VA, 5 A MAX For more info, see...
by Craig
Wed Jun 18, 2008 8:22 am
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

Excuse my ignorance, but I don't know the difference between a regulated and non-regulated power supply.
by Craig
Wed Jun 18, 2008 7:39 am
Forum: General Discussion
Topic: Simple DC Power Supply Schematic Needed
Replies: 38
Views: 11304

Simple DC Power Supply Schematic Needed

Hi Guys, My Dad asked me to build a DC power supply for his garden rail road. He supplied me with a transformer that he bought a Hammond 185G24 transformer. The datasheet on it can be found at http://www.hammondmfg.com/pdf/185Insert.pdf . It can output 24v @7.3 amps when the secondaries are wired in...
by Craig
Thu Apr 12, 2007 5:13 am
Forum: General Discussion
Topic: new question
Replies: 9
Views: 2300

OHM'S LAW In 1827 a German scientist named Georg Simon Ohm discovered a relationship between the voltage that existed across a simple electric circuit and the current through that circuit. He determined that the magnitude of a current is, in general, proportional to the magnitude of the emf that pro...
by Craig
Wed Apr 11, 2007 10:07 am
Forum: General Discussion
Topic: The impending death of incandescent bulbs
Replies: 100
Views: 20563

actually get full of darkness...the bulbs are dark suckers. when they are full..they fail to remove the darkness fromthe room Hmm, I always figured that the electrical company was teaming up with the light bulb manufactures. The electrically company will consume the darkness that the bulbs suck for...
by Craig
Wed Apr 11, 2007 6:03 am
Forum: General Discussion
Topic: The impending death of incandescent bulbs
Replies: 100
Views: 20563

What exactly is it that burns out in a fluorescent bulb?

Also, what is the largest LED bulb available? How does the brightness/efficiency work out as LED's get larger or smaller? Does it make sense (or would it be possible) to make something like a 1 inch LED?