Search found 162 matches

by John Shreffler
Wed Jun 03, 2009 7:53 am
Forum: Space Derby
Topic: Best Track
Replies: 12
Views: 8193

Re: Best Track

If you use more line tension, you must use more base weight to compensate. My website shows the use of an 8" solid cement block, which weighs over 50 pounds. but that is probably overdoing it. Regarding some lanes showing .0001, that would seem impossible, since there is a common clock. If somehow t...
by John Shreffler
Tue Jun 02, 2009 5:44 am
Forum: Space Derby
Topic: Best Track
Replies: 12
Views: 8193

Re: Best Track

A time of .0001 for all lanes is transmitted by the Judge if it did not receive the start signal. Make sure your magnet is being pulled away from the switch to a separation of at least 1.5". When the Judge gets that signal, it responds by a steady green light lasting 1.0 seconds. You say the track s...
by John Shreffler
Wed Apr 29, 2009 9:23 pm
Forum: Raingutter Regatta
Topic: Electronic timing
Replies: 3
Views: 3683

Re: Electronic timing

The job I did was one of a kind. The electronics were installed in a small box. The sensor and receiver pairs were looking over the top of the gutters at eachother. The boats' sails eclipsed the infrared light beams, and a LED at the end of the gutter showed the results to the audience. Simulataneou...
by John Shreffler
Thu Apr 16, 2009 5:37 pm
Forum: Raingutter Regatta
Topic: Electronic timing
Replies: 3
Views: 3683

Re: Electronic timing

I did one once.
by John Shreffler
Wed Mar 25, 2009 3:18 pm
Forum: Do-It-Yourself
Topic: Simple finish line circuit help
Replies: 14
Views: 5869

Re: Simple finish line circuit help

hmmm. It seems like it would have been less work to throw away the tower, and just mount the Judge with 4 screws provided. No painting needed. But as long as you are happy, hey, you are happy customer number 4485, owner of the least expensive Judge ever sold. :D
by John Shreffler
Tue Mar 17, 2009 9:31 pm
Forum: Trading Post
Topic: 42 Foot Track For Sale
Replies: 13
Views: 11112

Re: 42 Foot Track For Sale

I have some short pieces of the SuperTimer track here, and think it is really a great running surface. But the pictures of the support structure look like 1" PVC pipe. How stable is the track when it is set up?
by John Shreffler
Mon Feb 23, 2009 11:05 am
Forum: New Directions
Topic: Pinewood Derby Video
Replies: 0
Views: 1831

Pinewood Derby Video

One of my good customers, Gary Woodward, sent me a link to this Pinewood video he just created. Gary's mastery of video editing is quite apparent.


https://youtu.be/2e-Grr1uf9M
by John Shreffler
Fri Feb 20, 2009 4:33 pm
Forum: Do-It-Yourself
Topic: Phototransistor sensitivity question
Replies: 12
Views: 7100

Re: Phototransistor sensitivity question

Am I reading the datasheet on that right? 100mA? That does not sound right, but there is a lot of errors in data specs That could be the max current at a low duty cycle pulse. Remember catalog writers are not engineers. They don't have an idea of what specs mean. I use 10 ma of current into my emit...
by John Shreffler
Wed Feb 18, 2009 10:01 am
Forum: Do-It-Yourself
Topic: Phototransistor sensitivity question
Replies: 12
Views: 7100

Re: Phototransistor sensitivity question

Your photosensor has peak response at 870 nm, so it helps if the emitter is also putting out that light wavelength. For example using Digikey's HSDL-4250-ND should help immensely. Also, only that portion of the light cone that actually hits the sensor does any good. So go for narrow beam focus. The ...
by John Shreffler
Sun Feb 15, 2009 3:51 pm
Forum: New Directions
Topic: New Product: GrandPrix Start Gate Interface, Model GPI
Replies: 0
Views: 2151

New Product: GrandPrix Start Gate Interface, Model GPI

http://www.newdirections.ws/images/GPI.jpg This interface will trigger all of my start gate mechanisms with a mouse click from within the GrandPrix Race Manager application program, and provides an alternate solution to starting a race. Check out the start gates for various tracks at http://www.new...
by John Shreffler
Thu Feb 12, 2009 7:20 am
Forum: Commercial
Topic: Track purchase advice
Replies: 32
Views: 11443

Re: Track purchase advice

If using John's start gate with a MW timer, then John does need to make a modification to it, so it will not auto reset the gate before the heat is over. I offer a device for MicroWizard or other timers that do not tolerate the re-closing of the start switch prior to cars finishing. You can see it ...
by John Shreffler
Fri Feb 06, 2009 8:29 pm
Forum: Do-It-Yourself
Topic: Simple finish line circuit help
Replies: 14
Views: 5869

Re: Simple finish line circuit help

My mailing address is on all pages of my web site www.newdirections.ws You will be much happier with infrared detection, nothing touches the cars. Along with center line separation, give me the width of the track deck.
by John Shreffler
Fri Feb 06, 2009 7:16 pm
Forum: Do-It-Yourself
Topic: Simple finish line circuit help
Replies: 14
Views: 5869

Re: Simple finish line circuit help

Send me the distance between lane center lines and $20 and I will send you a Judge made from left over parts of early years. I don't mean to spoil your fun, and I do like the skill of the woodworking.

Randy: At this price, you can't consider this commercial.
by John Shreffler
Sun Feb 01, 2009 2:26 pm
Forum: New Directions
Topic: Another New Electric Start Gate Design
Replies: 1
Views: 1466

Another New Electric Start Gate Design

We are now offering a start gate latch that fits most all plywood tracks. Stop by and see it at http://www.newdirections.ws/PTG.htm All of our start gates are designed with our Light Tree in mind. However, they can also be activated with a mouse click while using GrandPrix Race Manager.
by John Shreffler
Mon Dec 01, 2008 9:03 pm
Forum: New Directions
Topic: Light Tree $5
Replies: 5
Views: 2311

Light Tree $5

I have a quantity of programmed microprocessors that are the heart of my light tree http://www.newdirections.ws/lighttree.htm available at $5 plus $5 S&H. This is an 8 pin chip with an internally programmed oscillator. Just add 5 volts and the pins provide a low-going voltage exactly as the animated...