Search found 18 matches

by i_myself_matthew
Mon Jan 12, 2004 5:01 pm
Forum: General Discussion
Topic: Need Advice on Multimeter purchase
Replies: 16
Views: 3449

Re: Need Advice on Multimeter purchase

how about one of these?<p>http://www.simpsonelectric.com/270-5.htm<p> :D
my current meter is a fluke 111
by i_myself_matthew
Mon Dec 01, 2003 8:28 pm
Forum: General Discussion
Topic: Stamp 2 Traffic Light
Replies: 11
Views: 2628

Re: Stamp 2 Traffic Light

One more possibility is to use a shift register for serial in/parallel out. I recently ran across a chip designed for driving 35 LEDs by National, a MM5451. However, it appears to be discontinued. Such an interface would require two wires for the data transfer: the data signal and a clock signal. It...
by i_myself_matthew
Fri Nov 14, 2003 3:35 pm
Forum: General Discussion
Topic: Calculators
Replies: 3
Views: 1176

Re: Calculators

Thank you very much Edd, that was just what I was looking for. I had looked on the internet before with no avail. <p>Now all I have to do is write the software....<p>Thanks again.
-Matthew
by i_myself_matthew
Wed Nov 12, 2003 10:22 pm
Forum: General Discussion
Topic: Calculators
Replies: 3
Views: 1176

Calculators

Does anyone know what protocol Texas Instruments graphing calculators use? <p>I am thinking of making a device to send data such as variables from a PIC chip to a graphing calculator and I was wondering what kind of provisions I need to make for such a design. The PIC would not be doing anything els...
by i_myself_matthew
Tue Nov 04, 2003 10:29 pm
Forum: General Discussion
Topic: computer supply in project?
Replies: 4
Views: 1071

Re: computer supply in project?

You would almost certainly need more than one computer power supply. I have strung computer supplies in series before, but I used the 5v line for my application. You would need to put on a load resistor on the 5v line for it to regulate properly. You could string two supplies together using the +12v...
by i_myself_matthew
Thu Oct 23, 2003 6:01 pm
Forum: General Discussion
Topic: stable clock timer..for a different LED clock
Replies: 18
Views: 3960

Re: stable clock timer..for a different LED clock

I once tried to derive 60hz by desterline's method, but for some reason it never would work. What I ended up doing was use a 555 chip to basically amplify the ripple peaks on the unregulated side of a 7805. It took some planning, and I needed a scope to get the 555 to trigger right, but it worked (u...
by i_myself_matthew
Fri Sep 12, 2003 8:15 pm
Forum: General Discussion
Topic: drill bits
Replies: 12
Views: 2370

drill bits

Hello<p>I have been told that regular drill bits dull quickly when drilling through PC boards. What kind of drill bit do I need to use, or what is another solution to this problem?<p>Thank you,
by i_myself_matthew
Wed Sep 10, 2003 8:40 pm
Forum: General Discussion
Topic: soldering irons
Replies: 1
Views: 791

soldering irons

I have seen ads for "thermally balanced" soldering irons. What am I missing by not using one?<p>Thanks
by i_myself_matthew
Sun Aug 31, 2003 8:49 pm
Forum: General Discussion
Topic: Need wireless mic schematic
Replies: 3
Views: 1531

Re: Need wireless mic schematic

So you're trying to see how many people you can annoy at the same time?
by i_myself_matthew
Thu Aug 28, 2003 8:58 am
Forum: General Discussion
Topic: Debouncing Switches
Replies: 7
Views: 3220

Re: Debouncing Switches

now how does that work? (debouncing software?)
by i_myself_matthew
Wed Aug 27, 2003 9:40 pm
Forum: General Discussion
Topic: Debouncing Switches
Replies: 7
Views: 3220

Debouncing Switches

Hello<p>What would be a good way of debouncing a momentary switch without using a 555 or a lot of components? <p>It would be used for PIC or TTL inputs, by the way.<p>Thanks.
by i_myself_matthew
Wed Aug 06, 2003 7:54 pm
Forum: General Discussion
Topic: Electronix Express
Replies: 2
Views: 849

Electronix Express

I would like to know what everyone's experience with Electronix Express. Good, bad, tips, anything. The reason I ask is because there appears to be little recent information about this company, which makes me uneasy ordering from them.<p> Electronix Express website <p>Thanks a lot<p>[ August 07, 200...
by i_myself_matthew
Tue Aug 05, 2003 3:45 pm
Forum: General Discussion
Topic: Here's How to Solve Our money Problems!
Replies: 21
Views: 5257

Re: Here's How to Solve Our money Problems!

If you keep posting replies, this thread WON'T die.<p>Please do not post any more replies.
by i_myself_matthew
Sat Aug 02, 2003 4:16 pm
Forum: General Discussion
Topic: Telephone Ring Indicator
Replies: 5
Views: 1526

Re: Telephone Ring Indicator

Would the process work backwards? Could you hook up a phone to the terminal, and call a number with Caller ID and read the result?<p>Just a thought.
by i_myself_matthew
Thu Jul 31, 2003 12:53 am
Forum: General Discussion
Topic: WTB for friend: Cheap 12V 20A supply
Replies: 10
Views: 2801

Re: WTB for friend: Cheap 12V 20A supply

Each individual supply that I have worked with has tied the chassis to ground, as well as the 0 volt line (black output wire). Assuming that the supplies are run off of grounded outlets, they will be at the same potential. <p>If you connect the +5 volt line in one supply to the 0 volt line in anothe...