Search found 74 matches

by VIRAND
Mon Sep 18, 2006 8:11 pm
Forum: General Discussion
Topic: Very far-fetched pre-project...
Replies: 23
Views: 8272

Ir remote’s don’t work anywhere near the THZ range cutting off very short as this is way past the giga Hz range and has soo many cycles quantitatively larger than a radio or general IR having hundreds of times if not thousands of time more saturation and information than most, leaving not only ...
by VIRAND
Sat Sep 16, 2006 2:15 pm
Forum: General Discussion
Topic: Since N&V won't publish it, here it is....
Replies: 3
Views: 2213

By the way, have you noticed that the BetaBrite remote control buttons are hard to push,
or is mine just slightly defective?
Usually this happens when remote controls wear out, and I know how to fix that problem,
but ALL the buttons were like that since I got it.
by VIRAND
Sat Sep 16, 2006 1:53 pm
Forum: General Discussion
Topic: Very far-fetched pre-project...
Replies: 23
Views: 8272

Terra Hz usually sees through walls. Which frequency sees through what depends on the material. For example if a radio works inside something, it is on a frequency that goes thru those walls. An Infrared TV remote uses TeraHz, but a cordless phone is around a GigaHz. Which goes through walls better...
by VIRAND
Sat Aug 12, 2006 2:46 am
Forum: General Discussion
Topic: Programming a microchip to speak text
Replies: 14
Views: 4957

I assume those chips are obsolete now.
Roman Black is easy and sounds good at 1KByte/sec.
by VIRAND
Sat Aug 12, 2006 12:34 am
Forum: General Discussion
Topic: Natural Gas Refrigeration
Replies: 10
Views: 2839

I thought this was about making it cold. Is lithium bromide an "natural gas"? From where in nature does it come? I thought it's an inorganic salt with theraputic effects on manic depressive people. How about having a swimming pool as a heat sink under a reflective roof, and by pumping the water thro...
by VIRAND
Fri Aug 11, 2006 4:07 pm
Forum: General Discussion
Topic: Natural Gas Refrigeration
Replies: 10
Views: 2839

natural gas cooling systems

This is probably not relevant to cars but is a lot of methods. 1.CO2 is sometimes recycled from smoke stacks and used to make "gassy fast food beverages". It comes in tanks and is mixed with the syrup and H2:O in the machine. However, if you rapidly spray the tank into a radiator with a fan blowing ...
by VIRAND
Tue Aug 08, 2006 5:49 pm
Forum: General Discussion
Topic: plasma HDTV TV's
Replies: 11
Views: 2720

I agree with the LCD. The dots are small and the display is the only kind you can get that doesn't flicker. DLP in theaters doesn't flicker but home versions do. When shopping for big TVs wave your hand in front of them and if they flicker you'll see lots of hands. Look closely and see if you can se...
by VIRAND
Mon Aug 07, 2006 1:23 am
Forum: General Discussion
Topic: Building your own CPU from TTL chips
Replies: 42
Views: 22939

Power-On-Reset (POR) can simply clear the counter...why not? Also, with only one instruction you can program to do anything, guess which one. COPY address1 TO address2 No need to waste a byte on the instruction code itself because it would always be the same. You just need a few "magic" addresses, a...
by VIRAND
Sun Aug 06, 2006 11:55 pm
Forum: General Discussion
Topic: Invisible infrared lamps...
Replies: 30
Views: 6885

The kind of paint on the wall may have a large effect on the reflectance of IR too. Try bouncing off aluminum foil? Exactly, if the camera can see direct but not reflected IR, then the surface is not reflecting. Imagine trying finding a green cloth in a dark room with a red lamp. Even if there is n...
by VIRAND
Sat Aug 05, 2006 12:00 pm
Forum: General Discussion
Topic: Goodbye RFID
Replies: 15
Views: 4708

This post was cleared but not removable.
by VIRAND
Thu Aug 03, 2006 1:25 pm
Forum: General Discussion
Topic: 431000 RAM Chip
Replies: 3
Views: 1197

Here are some similar 128KB SRAM that seem nearly identical to me.
At least one of these is sold by Jameco.
Digi-Key probably has them all.

628128
658128
TC551000 (?)
TC551001
by VIRAND
Thu Aug 03, 2006 1:00 pm
Forum: General Discussion
Topic: Programming a microchip to speak text
Replies: 14
Views: 4957

The problem with MP3 chips is how to record sound in MP3 format with a PIC?
PCM and PWM encodings are very simple. The MP3 encoding process is very complicated.

A playback-only system (PCM/PWM) would need only a binary counter and an EPROM, no PIC.
by VIRAND
Thu Aug 03, 2006 12:37 pm
Forum: General Discussion
Topic: Invisible infrared lamps...
Replies: 30
Views: 6885

Try dimming a 300 watt light bulb to the point where it is almost out except for a faint red glow.
50W of power might be about right for the effect.

I first noticed that video cameras can see infrared while doing something similar.
by VIRAND
Tue Aug 01, 2006 12:41 pm
Forum: General Discussion
Topic: Programming a microchip to speak text
Replies: 14
Views: 4957

well the cheapest PIC compatible digital camera memory flash cards are a lot more
than 2MB but there's no requirement to fill it all up.

2MB is probably the biggest size of DIP packaged flash memory I've seen (as a BIOS),
and everything after that is probably only made too small too solder by hand.
by VIRAND
Tue Aug 01, 2006 11:13 am
Forum: General Discussion
Topic: Maximizing Radio Efficiency
Replies: 18
Views: 6264

Just try this first then. It will be FUN.
Especially scavenging the trash for an old computer.

http://sci-toys.com/scitoys/scitoys/com ... itter.html