Search found 153 matches

by John Shreffler
Thu Feb 17, 2011 6:23 pm
Forum: Derby Products and Services
Topic: Free Infrared Emitters
Replies: 0
Views: 1885

Free Infrared Emitters

As a special to the experimenters on DerbyTalk, I have a supply of LTE-4208 5mm round, high power, tight focus, 940 nm infrared emitters. This is the part that I have used from 1994 through 2007 on all models of The Judge, and are either exactly, or close to what all other commercial finish line man...
by John Shreffler
Sat Feb 12, 2011 5:52 pm
Forum: Electronics
Topic: I have built Randy Underwood's Christmas Tree?
Replies: 7
Views: 2778

Re: Hsas anyone built Randy Underwood's Christmas Tree?

umm, I think you meant the 2003 needs pwr and gnd. Question: Are you joining the commons from the Light Tree to the common of the solenoid?
by John Shreffler
Sat Feb 05, 2011 10:50 pm
Forum: Space Derby
Topic: I have a need for speed but can't get there.......help!
Replies: 11
Views: 6084

Re: I have a need for speed but can't get there.......help!

I had the same problem when I made my first spaceship. It was too heavy for one thing, which I worked on. The major problem, however, was that it was nose heavy. Constantly trying to fly to the floor, and putting all kinds of friction on the line. Once I carved out enough weight from the nose to mak...
by John Shreffler
Sun Jan 30, 2011 7:32 pm
Forum: Derby Products and Services
Topic: Solenoids
Replies: 2
Views: 2162

Re: Solenoids

They can run continuous at 12 volts but I zap them with 30, and get ten times the yank. If you hit them with that for a second every 2 minutes, they will stay cold. Solenoids are robust, unlike most other components where you have to watch your voltages. It is rare to find a complete spec on this po...
by John Shreffler
Sun Jan 30, 2011 6:57 pm
Forum: Derby Products and Services
Topic: Solenoids
Replies: 2
Views: 2162

Solenoids

There seems to be an interest among the do-it-yourself crowd for solenoid powered starting gates. I am offering the same solenoid that is used in my line of solenoid gate latch mechanisms. They come with an elbow latch and tips on how to use them. $26 including shipping. http://www.newdirections.ws/...
by John Shreffler
Fri Jan 28, 2011 9:54 am
Forum: Derby Products and Services
Topic: Light Tree Chip
Replies: 1
Views: 1103

Light Tree Chip

I have some left-over light tree chips from last production run. $10 each, or 3 for $20. This is the heart of our best selling Pinewood accessory. http://www.newdirections.ws/lighttree.htm It is 8 pin 12F508. Add capacitor and battery to pins 1 and 8. Add a red, 2 yellows, and a green to pins 3, 5, ...
by John Shreffler
Fri Jan 28, 2011 9:34 am
Forum: Electronics
Topic: I have built Randy Underwood's Christmas Tree?
Replies: 7
Views: 2778

Re: Hsas anyone built Randy Underwood's Christmas Tree?

Ground is ground the world around. Of course connect the grounds.
by John Shreffler
Wed Jan 26, 2011 10:16 am
Forum: Electronics
Topic: Current methods for using computer to detect events?
Replies: 25
Views: 6437

Re: Current methods for using computer to detect events?

That is worth a try. I will always remember one customer setting up his track for testing in his barn. We spent days trying to figure out why nothing was working. Then finally, he said it all worked when he turned off his heater. It was some kind of propane burner that was continually ignited by a c...
by John Shreffler
Wed Jan 26, 2011 9:36 am
Forum: Electronics
Topic: Current methods for using computer to detect events?
Replies: 25
Views: 6437

Re: Current methods for using computer to detect events?

The impedance is a bit on the high side for sending things that far. I would certainly suggest twisting the wires, or perhaps going to a thin coax like RG174.
by John Shreffler
Sat Jan 22, 2011 11:27 am
Forum: Electronics
Topic: Current methods for using computer to detect events?
Replies: 25
Views: 6437

Re: Current methods for using computer to detect events?

Interesting experiment. I once made a simple model to demo a principle using reflective IR from ink patterns on a spinning white paper disc, so it is certainly possible to pick up the motion by light without disturbing the spin. However, since the final object is to translate your calculations into ...
by John Shreffler
Sat Jan 22, 2011 8:20 am
Forum: Electronics
Topic: Current methods for using computer to detect events?
Replies: 25
Views: 6437

Re: Current methods for using computer to detect events?

The chip delivers times to .0001 seconds expressed in ASCII and formatted serial 9600-8-none-1. The chip itself does not know or care that it is on a pinewood derby track and that the inputs are generated by IR sensors. The inputs could be switches, magnetic pulses into a Hall Effect device, mercury...
by John Shreffler
Fri Jan 21, 2011 11:14 pm
Forum: Electronics
Topic: Current methods for using computer to detect events?
Replies: 25
Views: 6437

Re: Current methods for using computer to detect events?

How many events are you looking at? If it is not over 8, you could use The Judge processor, and put the results into Excel, where you could compute deltas automatically. If interested, I could send you a chip.
by John Shreffler
Mon Jan 17, 2011 3:42 pm
Forum: Tracks
Topic: Derby Magic Track
Replies: 57
Views: 33276

Re: Derby Magic Track

I have samples of all commercial tracks. The plastic DerbyMagic and Supertrack are excellent running surfaces, but the support system of both of these tracks leaves a lot to be desired. If I was going to buy one of them, I would bargain for just the surface, and make my own stable pylon system. Just...
by John Shreffler
Thu Nov 11, 2010 6:35 pm
Forum: Derby Products and Services
Topic: 1 1/8" Tungsten Round
Replies: 17
Views: 5096

Re: 1 1/8" Tungsten Round

While Tungsten has a higher density, it is a very tough material to work with, hard to find, and expensive. By contrast, lead can be cut with a band saw, is readily available (see product 9032K274 at http://www.mcmaster.com" target="_blank), and inexpensive.
by John Shreffler
Fri May 21, 2010 9:19 pm
Forum: Derby Products and Services
Topic: Light Tree Kit Idea
Replies: 1
Views: 874

Light Tree Kit Idea

Sporty did a great job recently on converting a light stack available on ebay for $29. (ebay search: Tower Signal Stack) I had to buy one myself to see what it was like. Really nice. It is just light bulbs and lenses, so you have to figure out how to make it into a count down light. It includes a mo...