Search found 316 matches

by Gorgon
Sat Jun 24, 2006 9:37 am
Forum: General Discussion
Topic: -JPKNHTP
Replies: 5
Views: 1664

Hi,
I think the smallest geometrics is a 100 pin VQFP and 32 pin TSSOP. The last the most difficult due to the distance between the rows. It's a good help to be nearsighted :razz: , at least when you are as old as I am. :D

TOK ;)
by Gorgon
Mon Jun 12, 2006 1:59 pm
Forum: General Discussion
Topic: gambling machine, dices could be controlled
Replies: 8
Views: 2290

If this is a real machine, I would think they use a small camera to look at and score the dices. The same way they score the pins in a bowling machine. Doesn't take too much software to recognize the result, with proper filtering.

TOK ;)
by Gorgon
Sun Jun 11, 2006 1:59 pm
Forum: General Discussion
Topic: Profitable Surplus
Replies: 7
Views: 1916

At least you need to get an excellent crystal ball for a view into the future. I think it is much easier to make money on the stock market or win in the lottery :D

TOK ;)
by Gorgon
Tue Jun 06, 2006 3:31 pm
Forum: General Discussion
Topic: current follower
Replies: 2
Views: 951

Hope you can get some ideas from this http://www.allaboutcircuits.com/vol_6/c ... comparator

TOK ;)
by Gorgon
Tue Jun 06, 2006 3:25 pm
Forum: General Discussion
Topic: Error free (or very close) optical tach output
Replies: 6
Views: 1512

I would also take a look on your detector and filter or screen it from ambient light with 50/60Hz frequency. This optical 'noise' may well ruin your pulse detection, by adding pulses or overloading the detector.

TOK ;)
by Gorgon
Tue Jun 06, 2006 3:41 am
Forum: General Discussion
Topic: Error free (or very close) optical tach output
Replies: 6
Views: 1512

10 revs in 100ms = 100rev/s = 6000RPM

TOK ;)
by Gorgon
Tue May 30, 2006 2:52 am
Forum: General Discussion
Topic: Audio efficiency question
Replies: 17
Views: 4594

Hi,
If you only want a gong type door chime this chip is excellent http://pdf1.alldatasheet.com/datasheet- ... AE800.html

Iv'e used an earlier version (SAB600) 25 years, it will run on a 9v battery for several years, depending on the use.

TOK ;)
by Gorgon
Mon May 22, 2006 12:44 am
Forum: General Discussion
Topic: Neil Young math question
Replies: 3
Views: 1342

NOT getting tossed?? :D

TOK ;)
by Gorgon
Sat May 20, 2006 7:51 am
Forum: General Discussion
Topic: Neon for 240V
Replies: 24
Views: 4745

Since the resistor takes the whole voltage as it is, I don't think it will do anything spectacular if the neon breaks, maybe go dark? :D I just went down in the basement and found an old neon indicator(unused) I bought a long time ago. It is made for 230VAC as we've got here, and the resistor is 100...
by Gorgon
Sat May 20, 2006 7:22 am
Forum: General Discussion
Topic: lick here to unlock the door
Replies: 18
Views: 4250

Beside the hygiene and security issue described above, I wonder how long time it takes to analyze the DNA sample this way. More than 2.9 seconds, and you cross the natural or average impatience threshold for humans. I've seen research concluding that this is the time it takes before you'll press the...
by Gorgon
Sat May 13, 2006 8:08 am
Forum: General Discussion
Topic: RS232 - Parallel Port cable ground.
Replies: 4
Views: 1201

Re: RS232 - Parallel Port cable ground.

When using a parallel port or serial cable to connect to a circuit like some sort of a microcontroller project what should the cable shield goto? Should it be tied to signal ground or left floating? I assume with RS232 it should be left floating. From my experience it is not good practice to connec...
by Gorgon
Thu May 11, 2006 3:45 pm
Forum: General Discussion
Topic: lm2936 low power regulator question
Replies: 2
Views: 975

Hi,
What output voltage is your chip for? What is the output voltage from your micro? Values of capacitors used as decoupling and source?

Have you tried to supply it from the circuits power supply, if so, how does it behave then?

TOK ;)
by Gorgon
Thu May 11, 2006 3:25 pm
Forum: General Discussion
Topic: Touch Sensitive LEDs
Replies: 10
Views: 2355

Hi Matt,
Take a look at this chip from Freescale MC33794

I think you could make something out of this. I've got a demo kit named 'KIT33794DWBEVM', but as usual I have not had the time to tinker with it. I got it for free, but I don't know if it is available any more.

TOK ;)
by Gorgon
Thu May 11, 2006 3:12 pm
Forum: General Discussion
Topic: LCD Glass Panel Contacts
Replies: 7
Views: 1869

Hi, This is a problem with the contact rubber or zebrastrip. When mounted the first time it is compressed a bit, and when dismantled it stays more or less in the same state, and when moved and remounted the pressure is not kept for proper contact. There may also be a problem with alignment of the co...
by Gorgon
Wed May 10, 2006 10:42 am
Forum: General Discussion
Topic: 74F14 inverter
Replies: 14
Views: 3458

To save power you should pullup all unused inputs via a 2k2-4k7 resistor.
Use the same value for the pullup rsistor on the output from the LM319.

The main problem now is to select the inverter to use.

TOK ;)