So, I was browsing the electronic goldmine today, and I came across these. What do they do and how are they used? Do you apply voltage to the leads and it emits rf in all directions or what?
Question by LiquidLightning | last reply
I'm planning on building myself (or modifying my existing one) to create the ultimate workspace and among the several features I have planned (usb hub etc) I have one particularly tricky one, I'd like to integrate the desk with a speaker system but massive drivers wont cut it on such a small surface area. I had recently seen a speaker system that uses glass or crystal vibrating to create amazing sound, I was wondering how I'd shape such crystals and if anyone has any general ideas on the design of the speaker system ?
Question by Douglerful | last reply
I kind of know what it is, but i need a professional (Professer? Kiteman, my hero! LoL...) awnser. I know it is some form of crystal that when pressure is applied, positive (ions?) form at one side, and negative at the other. Also, how does a piezoelectrical ignitor work? What crystal does it use?
Question by PKTraceur | last reply
I bought a RC submarine that was running at 40Mhz. Submarine broke, seller shipped a replacement, but replacement could not be remotely controlled by original remote. In fact, while looking under the submarine, there was a sticker written "49Mhz - 3". I guess it is referring to Channel 3 - 49.860Mhz. So could I buy a 49.860 crystal, remove the 40Mhz crystal from remote controller, and get my submarine to run again? Is there anything else to consider???
Question by donstereo | last reply
I remmember seeing something on T.V. about an ancient civilization using crystals to power thier technology which happened to be very advanced (maybe atlantis?). i was wondering if it would be possible by studying reactions of atoms and molecules withing crystals to find one that if large enough could power something such as a levitaion device (perhaps create a crystal using certain compounds and manipulating atoms and molecules.) perhaps study the reaction of humans and crystals (we conduct arua and other things) i dunno. i wanted to see what other minds would think of how crystals could conduct energy to power a certain technology. please don't worry about critisism and let your mind flow free.
Question by REAEPR | last reply
Hi, I am a researcher and I am interested in the piezoelectric qualities of certain materials, specifically quartz or bone and wondered whether anyone had experience of passing sound through quartz/crystals/animal bones? Is it possible to use one of those material to carry sound? I know that glass windows can be used as large bone conducting speakers, just wondering if anyone has any experience of this? I haven't done any hands on experiments myself as I am still at the research stage. Any advice would be appreciated and a big help! Thanks
Question by Maudiema | last reply
Has anyone else heard that when a laser is passed through a citrine crystal onto bodily scars, it will remove scar tissue? Also, any news on research using a protein found in hepatitis ( c, d, or g,?) to cure aids?? I heard both of these on the radio. Thanks. kathleen
Question by kathleencleans | last reply
What do you think about the feasibility of a credit card sized crystal radio? (Fits inside a wallet) Some possible i though so far are... A simple pcb with a diode, and a capacitor and a coil wrapped(protected by duct tape) around it. The antenna has to be tied to a hole on a corner. Or it is coiled to the card, ready to be unwrapped. The ear piece can either be external... Or can be glued to the card itself, but you must put the card near you ear... Instead of a winded coil, maybe it can be part of the pcb design itself... and to tune it, you unhook a beady wire and place it in the holes placed in a interval. What do you think? Any more ideas? In fact. a competition can be made for this idea.
Topic by akimbo m | last reply
(If you want the blow-by-blow of my questions, skip the following gigantic piece of text and proceed to the 2nd list after the first) I was reconsidering making a crystal radio the past week and so I set out to research the topic on the 2nd most popular information database on the internet which comes out of the 1st most popular one. According to wikipedia, all you need is one diode in order to split the AC signal coming in via the antenna in half, therefore it uses half-wave rectification (it's not quoted; it's what I understand from it). Could full-wave rectification be also used? Like connecting the antenna to a bridge rectifier (aka. diode bridge, aka. 4 diodes stuck together)? I know that half-wave rectification yields pulsed DC, but I also don't understand how. By that I mean what happens to the other half? Does the other half of the wave connect directly to the output? One last thing, I know the largest metallic object I can ever use as an antenna is basically just my roof, but then I don't like coming up to the roof and looking for some exposed metal to connect to. Any thoughts on what huge, metallic items I can use in my household? I've already thought up a list of what I could use for an antenna: -Window screens -Extremely long piece of wire (I have an 8 meter long CAT5 cable going from the 1st to the 2nd floor) -My front gate -Sheet metal laying outside my front door (not the gate) Here is the summary of all my questions: -Is this wikipedia article true? (see at the list "semiconductor" area) -Can full-wave rectification be used on such radios? -In the case of half-wave rectification, where does the other half of the signal go? -What can I use as an antenna (excluding my roof)? Aside from the asked questions: -Is there any other way to tune to a particular frequency? -I'm asking opinions to people who know what they're doing (no offense to beehard44, this is more of a poll that anything else).
Question by nutsandbolts_64 | last reply
I have a rc kit and need to know what the reciver frequency is (so I can get a Transmitter). The crystal has nothing saying the frequency. The part number on the crystal is... 26 800 6BF-15 any help would be apprecated. Thanks. PS: While writing this My brother was playing with another Rc kit and it burst into flames.
Question by David97 | last reply
Can anyone please provide a link which speaks about this...for a beginner thank you in advance
Question by sandiri | last reply
- I know that a Green Tourmaline Crystal, when heated, will produce a negative and positive charge at respective ends of the crystal-so, if the heat source was a super glass lens ( convex or concave, i am not sure which would work most intensely, with the sun going through the lens and hitting the crystal- ( for the ecologically minded)-or a laser- or microwave blast, would we then have a natural battery? It may have to be a large crystal!
Question by kathleencleans | last reply
Germanium single crystal, which is made from Ge metal, who can tell me the basic and newly developed application?
Topic by marvin jiang | last reply
Hey everybody, I'm modifying some old walkie talkies I have, and I want to extend the range but I'm not sure how to do it, though, because it uses one of those crystal transmitter components to output 49 Mhz. If someone knows how to extend range on radio crystals please let me know! Thanks in advance!!
Question by Adum24 | last reply
I recently found a old pair of Crystal Eyes, and i recognized them as 3d stereo glasses, i found alot of wires, a manual, and an emitter box. I was wondering if their is an easy way to connect them to my computer I have a 8800GT and a Gateway 24inch monitor
Question by snowluck2345 | last reply
I have made a circuit of radio control switch with PIC16F and diplayed the value on LCD16X2, i am having the problem with its crystal frequency. When i set pic18F with its internal crystal of 4Mhz its working fine,but not with 16F using 4MHz external crystal and 33pF capacitor so how should i solve the problem of external crystal and its capacitance for pic16F.
Question by Alia Bakhsh | last reply
I just made a crystal radio and got it to work, but I can only get it to work during the day. Can any one tell me why it does that?
Question by techno guy | last reply
A normal oscillator will provide 360degree phase shift. of this 180degree is by the transistor amplifier and the remaining 180 is by the feedback circuit or tank circuit. but in the case of a pierce crystal oscillator ,it is the crystal which connected across the collector(output) and base provides 180degree phase shift the crystal provide 180degree phase ?
Question by mishal.abe
Would the time functions (delay, delayMicroseconds, millis, micros) wait the same amount of time (or increment as fast as for millis and micros), or would their time or speed be affected?
Question by VirtualBoxer | last reply
Hey- I'm going to build some Arduino clones (as posted from http://fritzing.org/projects/barebones-arduino/ ) and was wondering if it would be better to use a crystal or a ceramic resonator. i will be ordering from Tayda Electronics (Ive ordered before, 10 days shipping for rock bottom prices, I'm ok with that) and the resonators and crystals are +-5c. difference, so I was wondering if I could use resonators, since they are a bit cheaper and I'm ordering a few (around 8). Which ones would be better? Also, does anyone know for the circuit from the above link would work with a 4.5v supply if I just left out the 5v regulator? Many thanks- Astroboy907
Question by astroboy907 | last reply
I'm trying to inspect the deformation of small crystal chatons by image inspection, and I'm trying hard to minimize the reflections of light done by the geometrical shape of the crystal. I tried so many different ways and techniques, and i was wondering does the IR imaging do any help for this problem..?!
Question by eng_islam_h | last reply
I've seen many camera, they all have mechanical shutter, what is the possibility of having liquid crystal shutter in a camera,like in shutter glasses?
Question by Suraj Grewal | last reply
I have been looking for some crystal iodine suppliers in australia for quite some time now, but the only ones i can find sell it by the metric ton! there used to be a site called auschem or chemsupply . au that sold it but now i cant find it anymore, and when i search it, al they ever have is car washing stuff or products that you cant buy, i know for a fact there was a site that sold chemicals (othe rthan bargainmart) withoin australia, although with ridiculously high shipping, does anyine know where the site is now? or if theres another site that sells iodine crystals, or at leats potasium iodine cheaply?
Question by oldmanbeefjerky | last reply
I have several old remote controllers for vehicles and I need to switch the frequency from 49MHz to 75 MHz. I think that I should be able just to switch out the crystal oscillator and replace it with a 75 MHz crystal. Does anyone have any suggestions on if this will work or not? Thanks!
Question by transistorguy | last reply
I was cutting an iron L rod, and the cutting disk began to produce red sparks, instead of these habitual bright orange. Simultaneously, its cutting effectiveness was down dramatically. I searched in the web, and learned that this phenomen is named crystallization,and it is due to overheating. Now, my disk is a new one, I want not throw it to the waste. Any idea how to get it back? THANKS IN ADVANCE!
Topic by rimar2000 | last reply
I'm interfacing an Arduino to a chip that needs a 1 MHz clock signal. Can I take one of the Arduino's clock input pins an input it into a 74169 (4 bit cascading counter) to generate a 1 MHz signal? If not how do I create a 1 MHz 50% duty cycle signal? Thanks in advance.
Question by maewert | last reply
So today i got a bag , one of the things inside was a small bag labelled "Kandis", with the numbers 0000. Inside are large clear/white crystals about 1 cm2. The crystal structure is monoclinic. As in square with angled edges. If anyone can tell me what these are, i would be very grateful.
Question by LiquidLightning | last reply
I would like to make a mobile phone charger using a piezo electric crystal which can be placed inside our shoe, so that when we walk, we step on the piezo electric crystal and thus we can charge our mobile. for that i would like to kno more about piezo electric crystals, and how much force is to applied for getting an output of around 8 v and type of crystal to be used for this purpose. Thanks in advance.
Question by allsparkunleashed | last reply
As part of a very low budget film I have been asked to research how to make a prop from the following specification "We need a crystal stone the size of a tennis ball or a bit larger. It can be any shape but it must have colour (real of illuminated)." The reference has been given as a Copper Sulphate Crystal we are an a deadline for mid Feb so any help would be fantastic I have added reference pictures also All responses gratefully received Regards Peter?
Question by peterwalsh66 | last reply
I purchased a video game from WildTangent (Crystal Maze, to be exact) a couple years ago. But, I lost the unlock code and have forgotten my username and password, and therefore can't recover it. Any suggestions? Help would greatly be appreciated (No, I'm not willing to download torrents or cracked versions).
Question by TheOneAndOnlyMissingNo.
I need a detector for my crystal set,but don't want to use a geranium diode or that "cats whisker detector" that i cant get to work. PLEASE HELP ME, I NEED HELP!!! the cats whisker detector i used was a blued piece of steel / carbon (or pencil lead) from Youtube: [search] [make magazine foxhole radio] if a mineral like geranium, galea, iron pyrite (fools gold) work well, i would like to know how to obtain it without buying anything online? (i mainly don't want use a geranium diode because one i had burnt up. another reason why i don't want a 1N34A is because it isn't available at any "real physical" stores (like Radioshack ) i don't mind to use another type of diode. what about a schottky diode? do they sell any @ radioshack? and will it work?
Question by -max- | last reply
I have been researching how to build a crystal radio, and have built a few from schematics I have found on the web (though none have worked so far). The thing that is confusing for me is the range of forward voltage ratings I have found. Some of the part numbers I have come across such as 1N34A show a forward voltage of 1 volt. While others recommend 500mV and others as low as you can get. With so many instructions saying different values for best results. Is there a recommended rule of thumb for choosing a diode for a radio detector?
Question by atrumblood | last reply
Will using time library with an Attiny/45/85/84 ( http://playground.arduino.cc/Code/Time ) create an accurate clock? I keep on seeing people using these external crystal things. Do I need one? Isn't millis pretty dang accurate? How would I sync the clock with real time?
Topic by HavocRC | last reply
Question by SHESHANK | last reply
I want to replace or alter the crystal oscillator on my UNO as part of a electronics suicide workshop, look at it as circuit bending i guess. I want to know approximately what could happen- is it going to run a simple standalone program, I think serial and flashing will not be possible post-lobotomy but i can load the program before i bend it. The processing speed will be the same but any Millis() or clock functions will be way out? Will it just trip over its own feet and crash? I have heard interesting things about using your finger over the solder spots to make it run at 60Hz etc...Anyway i will experiment but i wanted to get some predictions from people who know this stuff at a more fundamental level! Cheers!!
Question by oliverkellow | last reply
For the past couple of days I have been interested and reading about crytsal radios. Having many issues recently, I do know that our radio stations here in Australia went to 'digital' and they removed analog T.V, but I never heard anything about radio. I can still pick up AM radio stations on the radio or in the car, but are these signals sent differently that a crystal cannot pick up? I attempted 2 versions of a foxhole radio, no luck at all there. So I went to Jaycar and bought this: http://www.jaycar.com.au/productView.asp?ID=KV3540 This proper PCB, with a galena diode still does not work. It also doesnt use a ground. Unless my aerial needs to be bigger which I doubt! I am using a 30ft spreader aerial. Later today I will stand NEXT to a radio station building which is only 2km from here, if it does not work, then no crytal radio works over here anymore which would really suck! How could they remove it!? And if I am wrong about the crystal stuff, then im still mad that the analogue technology has been removed anyway. It should sit there for anyone to explore.
Question by AtomRat | last reply
I fried the 27mhz receiver by accidentally reversing the polarity and i had the 75mhz laying around. I was wondering if putting the 27mhz receiver crystal in the 75 mhz reciever would work. Thanks in advance for your answers.
Question by jules15 | last reply