Search found 2870 matches

by haklesup
Thu Apr 15, 2004 6:18 pm
Forum: General Discussion
Topic: midi player
Replies: 15
Views: 3650

Re: midi player

My LG phone plays polyphonic ring tones in MIDI format. I use a program called Bitpim to load files directly onto the phones memory.<p>My problem is that I cannot find a MIDI editor with simple basic functions that would let me simply trim off some time from the beginning or end of a file (like I ca...
by haklesup
Thu Apr 15, 2004 1:01 pm
Forum: General Discussion
Topic: Speaker Wire Elevators
Replies: 43
Views: 10792

Re: Speaker Wire Elevators

Hi Extranet, I wouldn't buy them either and it sounds like you are short on leaded crystal goblets too. I was thinking that if ceramic glazed insulators will stand in for the goblets, something else would too. Perhaps a few glazed flower pots or suspending the cable from a board by fishing line woul...
by haklesup
Wed Apr 14, 2004 4:34 pm
Forum: General Discussion
Topic: Speaker Wire Elevators
Replies: 43
Views: 10792

Re: Speaker Wire Elevators

This is a prime example of how those few with money to burn can distinguish themselves with technology that although there is some (very some) scientific explanation to support the need (by the way, Bravo! Stephen for your analysis) the actual benifit to real live humans is negligable (an overstatem...
by haklesup
Tue Apr 13, 2004 5:29 pm
Forum: Robotics
Topic: root locus diagram
Replies: 10
Views: 4760

Re: root locus diagram

A root locus is the frequency domain equivelent of a Bode plot (time domain).<p>When you do a Laplace or Forier transform you are converting a complicated math expression (usually with lots of calculus) in the time domain to a simpler algebreic expression in the frequency domain. Once converted, it ...
by haklesup
Tue Apr 13, 2004 5:00 pm
Forum: General Discussion
Topic: whats the difference?
Replies: 6
Views: 1036

Re: whats the difference?

The 1376 has a higher minimum operating voltage but otherwise all the spec differences are favorable (higher max Vdd, temp, current etc) assuming your supply can put out a little more current at the same voltage, you should get a louder output.
by haklesup
Tue Apr 13, 2004 4:46 pm
Forum: General Discussion
Topic: Need help on a timer circuit
Replies: 11
Views: 1867

Re: Need help on a timer circuit

Ahhh, the thing I hate most about 555 chips. The trigger input is level sensitive not edge triggered.<p>If you want to stick with the 555, the traditional solution is a circuit sometimes called a "glitcher" because it creates a glitch (duh). It is basically a n.o. pushbutton switch with one pin tied...
by haklesup
Tue Apr 13, 2004 12:58 pm
Forum: General Discussion
Topic: Need help on a timer circuit
Replies: 11
Views: 1867

Re: Need help on a timer circuit

If you did not have the battery, changing light conditions which result in changing operating voltage that occur during the long period time cycle would have the effect of streaching and squeezing the pulse. The end of the pulse is triggered when output reaches a certain threshold, but if that is ch...
by haklesup
Mon Apr 12, 2004 6:41 pm
Forum: General Discussion
Topic: Switching lights with turn signals
Replies: 7
Views: 1778

Re: Switching lights with turn signals

How much current do you need to light each unit (one color, one lamp assy). You may be able to drive them directly with logic chips. You can get the rules about which lights go on when (using logic) and the drivers in the same circuit. If you need more current, a transistor buffer (inverting current...
by haklesup
Mon Apr 12, 2004 5:45 pm
Forum: General Discussion
Topic: 'gold' color /silver color on transistor EBC legs?
Replies: 9
Views: 1686

Re: 'gold' color /silver color on transistor EBC legs?

The bottom line is that it probably dosen't matter to the electrical performance of a well maintained (clean) circuit. However, under enviornmental conditions of high humidity, sodium contamination (from sweaty fingers) excessive vibration or other chemical / mechanical assault, the lead material an...
by haklesup
Fri Apr 09, 2004 1:32 pm
Forum: General Discussion
Topic: Need bezel for LCD dispalys
Replies: 3
Views: 1153

Re: Need bezel for LCD dispalys

DigiKey, Catalog T021 page 868
PRD Plastics; Bezels <p>DigiKey is the AOL of electronics retail. I get 9 catalogs a month and we have only 4 employees and there seems to be no way of stopping them.
by haklesup
Fri Apr 09, 2004 1:15 pm
Forum: General Discussion
Topic: Need help with a simple transistor circuit
Replies: 8
Views: 1706

Re: Need help with a simple transistor circuit

To answer the original question; you need to measure the voltage on the thermistor with a very high impedance connection so that no current is drawn away from the primary loop that is biasing the thermistor. If you do that, the circuit would probably measure the wrong temp (which is what you may ult...
by haklesup
Fri Apr 09, 2004 12:40 pm
Forum: General Discussion
Topic: Need help on a timer circuit
Replies: 11
Views: 1867

Re: Need help on a timer circuit

Using a 555 for a period of hours can work but you need to use a very large R and C and the time period may not be exactly repeatable each time. Big value resistors are cheap but larger value caps can cost more than you would expect. <p>A better way is to set the 555 up for a 1 second period and use...
by haklesup
Wed Apr 07, 2004 10:55 am
Forum: General Discussion
Topic: scanner antenna
Replies: 2
Views: 723

Re: scanner antenna

The FM dial on my radio goes from about 88MHz to about 108MHz so I would expect the FM antenna to work in at least that band ( and probably a bit more). This is a little higher than the 29-54 band and a little lower than the 108-136.975 band you listed. I expect that you should get some reception in...
by haklesup
Mon Apr 05, 2004 5:39 pm
Forum: General Discussion
Topic: Air purification
Replies: 5
Views: 1315

Re: Air purification

Look at the actual patent for some useful insights. I found this one by going to www.uspto.gov and doing a quick search on the term "Zenion" I got 17 hits and most are owned by sharper image<p>In fact if you have the patent number, you may find reasonable plans for a product right here. Though you m...
by haklesup
Fri Apr 02, 2004 4:34 pm
Forum: General Discussion
Topic: capacitance to voltage circuit needed
Replies: 2
Views: 791

Re: capacitance to voltage circuit needed

Sounds like you want to use the human body as the other side of a giant air gap capacitor, the other plate of which is attached to your circuit. As the person moves closer, the capacitance should increase.<p>You want a circuit that will vary it's output as a function of the change in this virtual ca...