Search found 316 matches

by Gorgon
Sun Apr 08, 2007 2:15 pm
Forum: General Discussion
Topic: test question 2
Replies: 6
Views: 1810

As the question is formulated A) is the correct, if by undervoltage is meant a control voltage relay. I don't know how you do this in a 120v environment, but here with 240V, we use 24V as a control circuit voltage.

TOK ;)
by Gorgon
Wed Mar 28, 2007 3:34 pm
Forum: General Discussion
Topic: SCI/RS232 <=> SPI
Replies: 1
Views: 1063

You could use a SPI UART chip to add a new serial channel to the micro, like the max3100.

Depending on the traffic, you could multiplex the SCI to 2 RS232 drivers with a couple of gates so you could switch between the PC and the sensors.

TOK ;)
by Gorgon
Sat Jan 27, 2007 5:00 pm
Forum: General Discussion
Topic: Hmmm, batteries are obsolete?
Replies: 14
Views: 4695

once apon a time i heard scientist tried to capture lightning with super caps.. a whole building full.. the experiment failed...miserably.. this was done somewhere in the desert from what i rember.. but this was done eons ago..maybe one day soon we will have the luck..i doubt it,, but who knows. I ...
by Gorgon
Tue Dec 26, 2006 4:34 pm
Forum: General Discussion
Topic: Duplicating routed board in Eagle
Replies: 5
Views: 2035

The main reason Eagle is like it is, is historic. In use, the version I have now(3.5x) is not much different from the version I started with in -93, in DOS. It's addapted to a GUI environment, but the basic engine is still keyboard/entry focused. I would think that for all users that can only/are us...
by Gorgon
Mon Dec 25, 2006 2:54 pm
Forum: General Discussion
Topic: Toner transfer pcb irony
Replies: 10
Views: 3481

If you glue [or tape] the catalogue paper on normal copy paper as a backing. You can see the making here. http://thomaspfeifer.net/direct_toner_pcb.htm Here it's used normal Scotch tape.

TOK ;)
by Gorgon
Mon Dec 25, 2006 2:34 pm
Forum: General Discussion
Topic: Electronics World ceased publication?
Replies: 4
Views: 1863

I don't think the 'Electronics World' is for the world, only UK. I used to subscribe on it, but the P&P abroad is insane. You get it for $90 in UK and I had to pay $160 in Norway, for one year.

If you compare with Elektor Electronics, you only pay $25 for the extra P&P ($82 vs $107).

TOK ;)
by Gorgon
Wed Dec 20, 2006 2:53 pm
Forum: General Discussion
Topic: Lithium ion battery pinout mystery
Replies: 11
Views: 3594

Re: Lithium ion battery pinout mystery

My granddaughter bought a Geni G910, a Korean cell phone, without a charger. The battery has three terminals, two close to each other on the left, and one on the right. Is there a way to determine which is positive and which is negative? TIA, Grant The Nicad batteries I've used of the same construc...
by Gorgon
Sun Dec 17, 2006 9:59 am
Forum: General Discussion
Topic: Taking votes on another thread that looks like spam
Replies: 22
Views: 6898

bodgy wrote:Well, don't have a maths question, have a philosophical one, such as - the the question is 100 what is the answer.
Easy = 4 or 9 or 16 or 25 ......

TOK ;)
by Gorgon
Tue Dec 05, 2006 11:06 am
Forum: General Discussion
Topic: How do you test for a draw on your car battery?
Replies: 14
Views: 3929

Replace the fuse first. This fuse is only protecting the low mA range shunt. The 10A range has normally a separate shunt.

If you can't find the leak when removing the fuses, try to remove the positive lead from the generator, starter, clock and computer if installed.

TOK ;)
by Gorgon
Tue Dec 05, 2006 12:54 am
Forum: General Discussion
Topic: How do you test for a draw on your car battery?
Replies: 14
Views: 3929

Digital or analogue, you use an ampmeter on the highest range, normally 10ADC. Loosen one pole(+) on the battery and put the meter between like you said. If your generator has a diode bridge, I would check out the diodes in this for reverse current leakage. This happens from time to time. Another po...
by Gorgon
Wed Nov 29, 2006 2:12 pm
Forum: General Discussion
Topic: Christmas light Fun
Replies: 9
Views: 3781

Re: christmas lights

zotdoc wrote:Look up www.computerchristmas.com, a great free do it yourself christmas light site! Merry Christmas!
There's an extra ',' in the link. Remove it in the address and you are good.

TOK ;)
by Gorgon
Fri Nov 24, 2006 3:14 pm
Forum: General Discussion
Topic: 555 timer headaches!
Replies: 31
Views: 7611

MrAl wrote:Andrew:
I switched to using a PIC where i can get delays up to something like
36 years :smile:
That must use an enormously big capacitor? :shock: :grin: 8)

TOK ;)
by Gorgon
Wed Nov 22, 2006 12:18 pm
Forum: General Discussion
Topic: 555 timer headaches!
Replies: 31
Views: 7611

I have experienced that some chips run into a deadlock/interlock on certain occations and conditions. The only way to fix that is to remove the power. For your 555, this could be an internal design flaw that require a current limit on the discharge output. The capacitor is not a special low ESR type...
by Gorgon
Wed Nov 22, 2006 11:46 am
Forum: General Discussion
Topic: Need motion detector module
Replies: 17
Views: 4881

Hello again, I like that little Prallelex heat sensor, but i am wondering how it works at other temperatures, like say -20 degrees F ? Does it still work at that temp or go south? I have looked through some sites for the temp data and found that most of the small PIR detectors had a temp rage of 23...
by Gorgon
Wed Nov 22, 2006 11:18 am
Forum: General Discussion
Topic: Polythermal fuse
Replies: 3
Views: 1872

Re: Polythermal fuse

Can anyone recomend a polythermal fuse to use with a 3amp voltage regulator ciruit? I'm a little confused because of the hold amperage and the trip amperage is so far apart on most. Should i choose a fuse that holds at 3amps so i can draw the max out of the voltage? regulator or should I choose a f...