Don, thanks so much for that link. I learned a few definite tricks and issues. I had already designed the basic R-S Latch on my own, but I was not sure if it...
18313
arhodes19044
Apr 1, 2005 1:47 pm
Is there an external timer commercially available and relatively inexpensive that is easy to interface to a BX-24? I am hoping to find something accurate to a...
18314
Don Kinzer
don_kinzer
Apr 1, 2005 5:01 pm
... The pulse width for a circuit like this is going to be equal to approximately N times the propagation delay for the inverter, where N is the number of...
18315
Don Kinzer
don_kinzer
Apr 1, 2005 5:05 pm
... The DS2404 may fit the bill. As a bonus, it has a 1Hz square wave output signal. You can interface it to the BX-24 using either the 1-wire or 3-wire...
18316
Don Kinzer
don_kinzer
Apr 1, 2005 5:20 pm
... Speaking of Schmitt inputs, I have often found it beneficial to condition input signals by running them through a 74HCT14. These are regular inverters...
18317
arhodes19044
Apr 1, 2005 6:54 pm
Don, that is really great. I will order some of those parts. I have been using the 4000 family of logic chips. I do remember seeing propagation delays of...
18318
arhodes19044
Apr 1, 2005 7:07 pm
That is a really nice device. It has some really good day/date and interval functions. Its granularity is 1/256 second, not better than the BX-24 itself. I...
18319
Tom Becker
b19063
Apr 1, 2005 7:15 pm
... Not likely unless you use an atomic source. If you need long-term accuracy, use GPS or get your own Cesium oscillator. For a rally computer, that's...
18320
arhodes19044
Apr 1, 2005 7:54 pm
Yeah, I guess it is overkill. I just was thinking about my wristwatch. It seems good to a few seconds per year. I check it against NIST periodically and it...
18321
arhodes19044
Apr 1, 2005 7:59 pm
A schmitt trigger. I can do that. The clock pulse coming off the 555 timer probably has a reasonably fast rise time. I have no idea about the hall effect...
18322
Paul Dubinsky
p_dubinsky
Apr 1, 2005 8:26 pm
As an ex-Pro Rally driver and a current professional rally instructor, you're more right than you might imagine. Accuracy is needed only for the stage that is...
18323
Tom Becker
b19063
Apr 1, 2005 8:43 pm
... seconds per month, or 90 seconds per year... Assuming these are equivalent ratios, they do not put the same demand on a timekeeping device, oddly. A clock...
18324
Neil Jepsen
neil_jepsen
Apr 1, 2005 8:47 pm
DS1302...
18325
Neil Jepsen
neil_jepsen
Apr 1, 2005 9:14 pm
Tom is right in both respects. I have a particular interest in "time" and in my office I have 4 old electro-mechanical pendulum master clocks. A Gents, an...
18326
raunig2003
Apr 1, 2005 9:57 pm
... You can feed the inverter signal to a RC circuit before feeding it to the AND gate to increase the delay. The delay actually can be calculated by knowing...
18327
Don Kinzer
don_kinzer
Apr 1, 2005 10:58 pm
... Here is a shorter URL, courtesy of TinyURL (very convenient): http://tinyurl.com/3jjzs Don...
18328
Mike Perks
basicx_austin
Apr 2, 2005 11:33 am
The BasicX platform is great for beginners because there is a low initial investment in both hardware and software. The platform is also good for more advanced...
18329
arhodes19044
Apr 2, 2005 2:58 pm
Hello, Paul. Yes, I am into Pro Rally, but as a support person. My brother is a navigator for the RedMist Rally team. "Our" vintage Datsun 510 is due to be...
18330
arhodes19044
Apr 2, 2005 3:02 pm
Yep, we are back to that old thread of the timekeeping of a BX-24. If the accuracy over a day or two is as good as a quartz wristwatch, then that is good...
18331
arhodes19044
Apr 2, 2005 3:06 pm
I will check out your reference. It is interesting to use one type of chip for all these functions! -Tony ... further. ... the ... inverter ... inverters ... ...
18333
Paul Dubinsky
p_dubinsky
Apr 2, 2005 3:41 pm
Hey, Tony, I ran an Eagle Talon in PGT until Laughlin O'Sullivan offered to buy the car so that he could finish the season and get his Mitsu factory ride. I ...
18335
Tom Becker
b19063
Apr 2, 2005 4:04 pm
... [Dang it! Yahoo insists on including the punctuation, now gone, in the links; these should work.] One can also implement very flexible logic in one...
18336
tombhandley
Apr 2, 2005 4:51 pm
Tom, as far as PLD/GALs, I started with AMD and filling out a form before PEEL, etc ;-) Then I used PALASM and ABEL. Now days I use Verilog and sometimes VHDL...
18337
tombhandley
Apr 2, 2005 5:04 pm
Is there a way to tell Yahoo's message engine to keep my format? I notice when I preview a message, it's looks fine, but when my message is posted next to an...
18338
Tom Becker
b19063
Apr 2, 2005 5:20 pm
... I don't think you can control how others see your posts, but the group Membership settings permit you to strip HTML and receive only text messages. Tom Tom...
18339
arhodes19044
Apr 2, 2005 8:06 pm
I LOVE the idea of PLD's. I had "sort of" a problem when I was trying to work out the logic of the interrupt-creating hardware before I came on the idea of a...
18340
raunig2003
Apr 2, 2005 8:12 pm
yes 74- or 4000 series devices date back to the mid 70's and are a much older technology. I am not sure how you would incorporate RC circuits with PALs or if ...
18341
raunig2003
Apr 2, 2005 8:25 pm
It might help to design your circuit if you write down all the input signals levels on the left side of the page and what the corresponding output signal on...
18342
Tom Becker
b19063
Apr 2, 2005 8:26 pm
... add it to the links... Datasheets would go into the Files section. You can do that yourself or, if you wish, send it to me and I'll put it up. Tom...
18343
Don Kinzer
don_kinzer
Apr 2, 2005 8:57 pm
... An edge-triggered J-K or D flip-flop meets all the requirements stated above. The schematic to which I posted a link a day or so ago shows how to wire a...
