Search found 153 matches

by John Shreffler
Fri Feb 06, 2004 7:56 pm
Forum: Electronics
Topic: Electronic Gates
Replies: 4
Views: 4270

Re: Electronic Gates

My commercial product, The Judge, has two sensors available. The standard sensor is a photodiode that is driven into saturation by an infrared LED beamed into it. The car causes a shadow, and the diode rapidly comes out of saturation. The system is immune to flash photography because a sudden increa...
by John Shreffler
Thu Feb 05, 2004 9:40 am
Forum: Electronics
Topic: Electronics Under construction
Replies: 5
Views: 4882

Re: Electronics Under construction

If anyone is building their own electronics for PWD, and having trouble finding LEDs, resistors, ICs, caps, etc, please drop me an email. I have a lifetime inventory that would make Radio Shack wince. If I have it, it is yours, all I need is the postage. I also dispense solid design tips on circuitr...
by John Shreffler
Wed Feb 04, 2004 9:58 pm
Forum: Electronics
Topic: The Judge timer
Replies: 33
Views: 18584

Re: The Judge timer

Hi. John here. I make The Judge. I have been reading over the posts and find them interesting. A few comments on points raised: A start gate that wants to open, but held back by a latch, is far superior in keeping results consistant. I supply a magnetic switch which is the most reliable start signal...