Search found 2015 matches

by philba
Mon May 18, 2009 9:12 am
Forum: Computer Programming
Topic: Help with RJ45 Network Connector
Replies: 45
Views: 7910

Re: Help with RJ45 Network Connector

Like I said earlier, it doesn't take much to replace the rj45 connector. I would think a $15 tool would be worth buying to fix this irreplaceable cable.
by philba
Mon May 18, 2009 9:09 am
Forum: General Discussion
Topic: PWM freq optimization
Replies: 8
Views: 1177

Re: PWM freq optimization

The correct PWM frequency is really dependent on the application. There are too many factors to give a rule of thumb. Not wanting to quibble but most stepper drivers don't really use PWM. It looks a lot like PWM but frequency and duty cycle are not determined in advance. It's determined by the curre...
by philba
Mon May 18, 2009 8:56 am
Forum: General Discussion
Topic: Current limits for printed circuit board traces
Replies: 11
Views: 2132

Re: Current limits for printed circuit board traces

You can do all the math but why bother - use a calculator like this one http://circuitcalculator.com/wordpress/ ... alculator/
by philba
Sat May 16, 2009 12:37 pm
Forum: Computer Programming
Topic: What is best way to check out used computers?
Replies: 5
Views: 1107

Re: What is best way to check out used computers?

You could try a "live CD" if they have an optical drive in it. Ubuntu would be a good one. Download the live CD image and burn it onto a CDR. Then stick the disc in a drive and reboot. it will take time but ubuntu will boot up. If it runs, the machine is probably ok.
by philba
Sun May 10, 2009 7:54 pm
Forum: General Discussion
Topic: Logic Analyzer Help~
Replies: 21
Views: 3148

Re: Logic Analyzer Help~

I recall reading the USBee literature that you can log your sessions for later playback. Don't know about the Salae unit.
by philba
Sun May 10, 2009 4:39 pm
Forum: General Discussion
Topic: Logic Analyzer Help~
Replies: 21
Views: 3148

Re: Logic Analyzer Help~

A logic analyzer doesn't care how slow it goes. You pay for speed and channels. I think most of your data will be digital (or limited to 2 values - on and off). Your problem seems to be more of a data acquisition problem, though. You'll probably have to write the analysis code yourself as the issues...
by philba
Sun May 10, 2009 8:14 am
Forum: General Discussion
Topic: Logic Analyzer Help~
Replies: 21
Views: 3148

Re: Logic Analyzer Help~

I can see how your conditioner pod would work. Some thoughts: - your indicators could be set up to also indicate polarity. green for +, red for - and both for AC. - you want to be careful with switching between HV and LV. Could be a hazard. There may be a way to autoswitch but I'm not sure of the te...
by philba
Sat May 09, 2009 8:25 pm
Forum: General Discussion
Topic: Celular Phone Tapping...
Replies: 2
Views: 678

Re: Celular Phone Tapping...

You'd have to crack the encryption first.
by philba
Sat May 09, 2009 8:20 pm
Forum: General Discussion
Topic: Logic Analyzer Help~
Replies: 21
Views: 3148

Re: Logic Analyzer Help~

Here's a fixed version of the url http://www.dataq.com/products/startkit/di148.htm That's a reasonable price though it's limited to 14.4KHz. More importantly, it's missing the triggering that logic analyzers have. This is key if you are trying to catch transient problems. You can set up complex trig...
by philba
Thu Apr 30, 2009 10:35 am
Forum: General Discussion
Topic: 4/30 promotion
Replies: 1
Views: 644

4/30 promotion

Hey, TI is offering fantastic discounts on their MSP430 development tools. It looks like 50% off. That's an awesome bargain. I've got their zigbee dev stuff on order. Here's the order page. http://www.ti-estore.com/merchant2/merchant.mvc?Screen=CTGY&Category_Code=MCU Add the code 430ROCKS during che...
by philba
Thu Apr 23, 2009 10:38 pm
Forum: General Discussion
Topic: Time Base
Replies: 7
Views: 1092

Re: Time Base

From the sounds of it, your processor solution didn't use interrupts to track time. That would have fixed your missing count problem. Over the longer run, any solution based on a crystal will drift. Even a 20 ppm crystal will lose up to a bit more than 50 seconds per month. The best solution is to s...
by philba
Thu Apr 23, 2009 8:09 am
Forum: General Discussion
Topic: Remote Control Specs?
Replies: 19
Views: 2222

Re: Remote Control Specs?

Uh, it's not that hard... Click on "files", then click on "philips pronto and pronto pro classic". The CCF files are under "Component Configuration Files" and the utilities are under "Programs, Utilities & Documentation". There are number of utilities that will dump out the contents of a CCF file. I...
by philba
Wed Apr 22, 2009 11:38 am
Forum: General Discussion
Topic: Remote Control Specs?
Replies: 19
Views: 2222

Re: Remote Control Specs?

I don't know what the problem was. I never registered and was able to download a number of files without getting accosted. I downloaded something called CCFtools which has a CCF (pronto file format) decompiler. It lists the raw code data. Elsewhere on the site I found a file that describes the raw f...
by philba
Tue Apr 21, 2009 7:39 pm
Forum: General Discussion
Topic: Remote Control Specs?
Replies: 19
Views: 2222

Re: Remote Control Specs?

I'm not interested in making one but here's how I would do it. The Phillips Pronto is a nice programmable remote that, unfortunately costs more than a decent AV Receiver. However, there are IR code files for hundreds of devices that the pronto understands. I think the format is documented on remote ...