Search found 2856 matches

by haklesup
Wed Apr 28, 2004 6:28 pm
Forum: General Discussion
Topic: ultraviolet LEDs ?
Replies: 10
Views: 5029

Re: ultraviolet LEDs ?

nM are 10E-9 Meters and I believe Angstroms are 10E-10 Meters. So, just a decimal point different. 3900Au = 390nM
by haklesup
Tue Apr 27, 2004 4:28 pm
Forum: General Discussion
Topic: ultraviolet LEDs ?
Replies: 10
Views: 5029

Re: ultraviolet LEDs ?

Heres a good link on the topic:<p>http://members.misty.com/don/ledbl.html<p>He hints on ways to use them to make a blacklight and has links to other informative sites.
by haklesup
Tue Apr 27, 2004 3:07 pm
Forum: General Discussion
Topic: getting rid of noise on car radio
Replies: 9
Views: 2097

Re: getting rid of noise on car radio

Does this radio interface to an amplifier (OEM or one you put in). If so, your noise is almost certainly a ground loop. This means that the ground voltage (noise) at the amp is different than that at the head unit. You are hearing the difference between grounds at two or more points <p>Trying to cle...
by haklesup
Tue Apr 27, 2004 2:53 pm
Forum: General Discussion
Topic: Speaker Wire Elevators
Replies: 43
Views: 10307

Re: Speaker Wire Elevators

Surely, there is more to hearing than the ability to percieve pure tones of a single frequency (typical hearing test). Most tests and measurements I could perform require these pure tones or other contrived things like pink or white noise.<p>I do admit, even though I am still very dubious of the eff...
by haklesup
Tue Apr 27, 2004 2:25 pm
Forum: General Discussion
Topic: Power 5v device on 3.6v
Replies: 2
Views: 822

Re: Power 5v device on 3.6v

Are you trying to use a microdrive (compact flash type II) in the CF socket on your PDA but just don't have enough power in the PDA battery or is it more complicated.<p>You generally cannot run 5.0V logic with a 3.3V supply. IC devices recognize certain voltage levels as logical 1 and 0. These volta...
by haklesup
Mon Apr 26, 2004 1:28 pm
Forum: General Discussion
Topic: recovery of gold from electronics
Replies: 5
Views: 2406

Re: recovery of gold from electronics

Cyanide is less harmful to the enviornment than elemental Mercury in the long run since it will break down. <p>Etching using KI&I is generally safe and effective (selective) and should be easy to get. 4.3g KI + 1.3g I + 100g H2O<p>Aqua regia (hydrochloric and nitric acids in various ratios) will dis...
by haklesup
Fri Apr 23, 2004 12:33 pm
Forum: General Discussion
Topic: 556 and Flip Flop
Replies: 3
Views: 808

Re: 556 and Flip Flop

First half of the 556 is running a fast cycle all the time, say 2Hz (16 flashes in 8 seconds). It is in astable mode<p>Second half is configured as a 1 shot with 8 second period triggered by a pushbutton. Output is high for 8 seconds when button is tapped.<p>NAND the output of these two sections. Th...
by haklesup
Thu Apr 22, 2004 2:25 pm
Forum: General Discussion
Topic: AFT wont lock
Replies: 7
Views: 1192

Re: AFT wont lock

The replacement was for the whole set not the part. My preference for waiting was not a safety position in case I screw up, I have confidence in my repair skills and in your authoritative answer. I just like to watch TV while I fix TV. I was planning to buy a new set all along and the amount of padd...
by haklesup
Thu Apr 22, 2004 2:08 pm
Forum: General Discussion
Topic: Damned lightbulb burned out AGAIN
Replies: 11
Views: 2588

Re: Damned lightbulb burned out AGAIN

We have a socket like that at my office. Incandescent bulbs burn out in under a month. The primary culprit was vibration. This fixture was in a place that got a lot of acoustic vibration caused by a nearby road (i.e. low frequencies but quite loud).<p>We replaced it with a new compact flourescent bu...
by haklesup
Wed Apr 21, 2004 12:14 pm
Forum: General Discussion
Topic: AFT wont lock
Replies: 7
Views: 1192

Re: AFT wont lock

Thanks Edd, I had a feeling I would hear from you on this one. Peeked inside again last night and the description of the module you gave fits very well. Though I couldn't see markings, the size, location and presence of the pot on top all fit perfectly.<p>Lucked out would be right if I can effect a ...
by haklesup
Tue Apr 20, 2004 4:24 pm
Forum: General Discussion
Topic: Dallas iButton Help
Replies: 4
Views: 1072

Re: Dallas iButton Help

Use a different supply for the pullup/power to the iButton as you do for the rest of the circuits. You probably have a 5V regulator IC in there someplace. Put another one in right beside it and use that supply to power the interface (pullup resistor). Now if someone shorts the interface, only that s...
by haklesup
Mon Apr 19, 2004 3:45 pm
Forum: General Discussion
Topic: AFT wont lock
Replies: 7
Views: 1192

AFT wont lock

I've got this old Sony TV (circa 1993)and while using the AV inputs it works fine but when trying to tune any channels with the internal tuner it looks like someone has taken hold of the fine tuning knob and is twisting it back and forth (~0.5 Hz) so that the channel never locks in clearly. (i.e Aut...
by haklesup
Mon Apr 19, 2004 3:29 pm
Forum: General Discussion
Topic: Ways to do things
Replies: 5
Views: 1030

Re: Ways to do things

So you're saying there is more than one way to skin a cat (and no one on board liked cats). Hmmmm..... ;)
by haklesup
Mon Apr 19, 2004 2:21 pm
Forum: General Discussion
Topic: Switching lights with turn signals
Replies: 7
Views: 1672

Re: Switching lights with turn signals

You said a lot but I think this was the crux of it " What I want to do is when the directional is hot, to pull a segment of R + G high (5v) and B low. When current isn't flowing through the directional, it would work in the normal fashion getting it's power from the existing supply. (Which could be ...
by haklesup
Fri Apr 16, 2004 2:35 pm
Forum: General Discussion
Topic: Need help on a timer circuit
Replies: 11
Views: 1719

Re: Need help on a timer circuit

I see no difference between a switch pushed by your bumber or your finger. <p>Is this because the bumper option does not seem to be a momentary switch and as a doorbell button would be? A little mechanical design creativity can fix that.<p>For a 555 circuit, as long as your button push (trigger puls...