Crystals

For sale is some Fox Crystals (55.8MHZ) and a crystal assortment. Thanks for looking. 

Topic by tinstructable 8 years ago


Crystal Speakers? Answered

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 8 years ago  |  last reply 8 years ago


"Standard" Crystals? Answered

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 8 years ago  |  last reply 8 years ago


Casting Crystals?

I want to fabricate and cast crystals to then cast in glass. I've done glass casting before, but not much mold making. If I have a wax positive, I can melt it out of the plaster/silica mold so it doesn't have to be a 2-part mold as long as there aren't any undercuts, which there won't be. My question is how can I fabricate and then cast crystals to then cast in wax to make my glass mold? I'd like to work with silicone since it is flexible and then I won't have to make a 2-part mold. I thought about cutting foam to make the crystals, but I want the edges to be very smooth so that the glass casts look like crystals. I also thought about carving glycerine soap and casting that, but not sure how it would hold up to being cast with any flexible mold-making materials like silicone. Any advice?

Question by shortone 6 years ago  |  last reply 6 years ago


Crystal Shortwave receiver

Help!! On how to make a crystal shortwave receiver. Schematics, picture diagrams, parts list and building instructions will be greatly apreciated.

Topic by Jezan 9 years ago  |  last reply 9 years ago


What is a piezoelectric crystal? Answered

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 10 years ago  |  last reply 9 years ago


Crystal circuit board ?

Can crystals ( quartz, ruby , amethyst, etc.)  be used in technology to amplify power? keep power sustained, renew power or something ? 

Question by AlexxSolace 6 years ago  |  last reply 6 years ago


Copper Crystal Metal

Hi, Please assist. I am looking for ways to create copper crystals from copper sulfate liquid by using chemicals only. I found a company in South Africa that's doing exactly that.

Topic by CrystalCopper 6 years ago  |  last reply 6 years ago


Help Me to Make a Flower Using Crystal

Please Anybody can help me to Make a Flower using crystal. several crystal items were in shop. so pretty. then i though to make one. please share with me. thanks. Note. i am a new one to this forum!

Topic by mnms1983 6 years ago  |  last reply 6 years ago


Crystal installation - does it matter?

I'm having some problems with a tranmiter i made. It hasnt been working as the sound is odd. i noticed when u touch the crystal the sound changes. so, Does it matter which way a crystal goes in? is there any + - sides?

Topic by Killa-X 11 years ago  |  last reply 11 years ago


Beautiful Crystal Covered Apartment

Copper-sulfate crystals are lovely with their rich blue color. So lovely that artist Roger Hiorn completely covered the inside of an apartment in London with them. This was done by sealing it and pumping in 75,000 liters of supersaturated solution. After it had cooled and been drained off, the doors have been opened for visitors to come in two or three at a time. This can only be done since the apartment was set to be demolished. Stop by before it closes on Nov. 30 and gets destroyed. Link

Topic by fungus amungus 10 years ago  |  last reply 10 years ago


what is the application of germanium single crystal

Germanium single crystal, which is made from Ge metal, who can tell me the basic and newly developed application?

Topic by marvin jiang 8 years ago  |  last reply 8 years ago


Large Crystal Bowl Broken --- Any Ideas?

A large Romanian crystal bowl that has a lot of sentimental value for me was just accidentally broken. Any crafty ideas on how to reuse/repurpose/recycle this piece of my personal history?

Topic by cab47cpa 6 years ago  |  last reply 5 years ago


How do you clean the white stains from the inside of a crystal decanter?

On my crystal wine decanter there is a white deposit on the inside of the decanter. I would like to know how to eliminate it. Can anyone help?

Question by framer889 9 years ago  |  last reply 4 years ago


I have been asked to investigate how to make "a crystal stone the size of a tennis ball or a bit larger." low budget Answered

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 7 years ago  |  last reply 4 years ago


Where can I find coke (coal)?

I am building a crystal radio but I need to find a piece of coke...  Can I make it somehow?

Question by rickonicko 9 years ago  |  last reply 9 years ago


Glass armonica

Hello everyone today I found an interesting instrument known as the glass armonica (Also glass harmonica or hydrocrystalophone.) I began looking to see if there were any available online only one company i found even makes them (links at bottom) and they charge a very large sum of money for said instrument I want to see if anyone can make one.  http://www.finkenbeiner.com/ http://www.youtube.com/watch?v=_XPfoFZYso8&feature;=player_embedded

Topic by wyyve 7 years ago  |  last reply 7 years ago


Help about homegrown crystal

I want to grow a crystal which is something written inside it and when you put some light on it, text will reflect on wall. is it even possible? any idea about how to do it guys?(also ladies :D)

Topic by ashbazg 3 years ago  |  last reply 3 years ago


Credit card crystal radio

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 11 years ago  |  last reply 7 years ago


Crystal radio help anyone?

(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 8 years ago  |  last reply 5 years ago


add an external crystal to attiny85?

How can i add a 16mhz crystal to attiny85? i dont know how and cant find it online

Question by fossilshark 3 years ago  |  last reply 1 year ago


How to "vajazzle" the vulva with crystals?

Greetings, Looking for how-to on decorating the vulva with crystals a la Jennifer Love Hewitt and Completely Bare Spa. http://www.stylelist.com/2010/01/13/jennifer-love-hewitt-swarovski-crystal-vajazzle/ http://www.completelybare.com/brazilian-bikini-wax.php?osCsid=6d24517ce06a68dacd7b3876dcac3d56 Thanks

Topic by NeuroPulse 9 years ago  |  last reply 8 years ago


adding an external crystal to attiny85?

How can i add an external crystal to run at 16 mhz to my attiny85? can someone please tell me step by step what to do i have searched everywhere and cannot find the answer. thanks.

Question by fossilshark 3 years ago  |  last reply 3 years ago


Citrine crystals and hepatitis protein?

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 8 years ago  |  last reply 8 years ago


I need to grow a 3.25 foot wide salt crystal and don't know how

I'm experimenting with lenses and want a big one(to big for the kiln) so i decided to try salt. I've grown small crystals in a pot almost 1 inch wide but don't have a clue how to scale it up.

Topic by AlbinoMoose308 6 years ago  |  last reply 6 years ago


What type of electronic component is this?

It looks like an elongated crystal module to me. I tried looking it up using the part number but to no avail. I came across it while stripping the board of a crt tv.. As always, I greatly appreciate what help can be offered.

Topic by fdsafdsaqwrewqrbsafdsagrgew 6 years ago  |  last reply 6 years ago


how to design a crystal oscillator for a particular frequency using quartz crystal

Can anyone please provide a link which speaks about this...for a beginner  thank you in advance

Question by sandiri 5 years ago  |  last reply 5 years ago


My iPod Crystal Radio Idea

I'm Sure someone has had this idea before but I just want to know if people think this would be cool. I was thinking about make a breadboard with a crystal radio transmitter with a head phone jack sticking out of it, that would fit in some sort of case, and have it stick into my iPod Nano 3rd Generation. My iPod is red so I would paint the case red to match, Please post idea and links to the parts please.

Topic by Nameless37 10 years ago  |  last reply 7 years ago


were can i buy crystal iodine in australia?

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 8 years ago  |  last reply 1 year ago


i need a detector for my crystal set, PLEASE HELP

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- 9 years ago  |  last reply 8 months ago


Do crystal radio's work when 'digital radio' has taken over?

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 6 years ago  |  last reply 4 years ago


Hey, Hey, Hey Come and Join Us!

Hi Crystal Lovers, Come and Join us here! Georgegoalie

Topic by georgegoalie 11 years ago  |  last reply 11 years ago


ATTINY As A Clock?

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 4 years ago  |  last reply 4 years ago


Casimir Effect Outside a Lab

Does anybody know how to go about recreating the Casimir effect outside a lab? Say I have a vacuum chamber and two copper plates. I want to create the Casimir effect within the vacuum chamber, Only problem is that to do so, from my understanding, I'd have to have the copper plates within nanometers of each other, I've heard of methods using oscillating crystals...can anyone help me?

Question by ted_gress 3 years ago  |  last reply 3 years ago


how can i grow crystals?

I want to grow crystals, additionally i want to grow crystals in a particular shape ive seen it been done before however i can not figure it out. Does any one have any insight?  thank you 

Question by puregoldner 8 years ago  |  last reply 8 years ago


what is the difference of the crystal 4 leads and 2 leads?

I want to make a simple AM transmitter, which is use a crystal with 4 leads. and i don't have crystal with 4 leads, i only have crystal with 2 leads, can i use crystal with 2 leads ?

Question by Rendydevara 9 years ago  |  last reply 9 years ago


Crystal walkie talkie range extender? Answered

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 7 years ago  |  last reply 7 years ago


Green Tourmaline Crystal as a natural battery- Answered

-  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 9 years ago  |  last reply 8 years ago


Finding out the value on a rc crystal?

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 7 years ago  |  last reply 7 years ago


Is it possible to replace a 40Mhz crystal with a 49.860Mhz?

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 7 years ago  |  last reply 7 years ago


3D Glasses setup? Crystal Eyes?

 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 9 years ago  |  last reply 8 years ago


crystal oscillator TCXO VCXO OCXO

Guangzhou zgc electronic co.ltdZGC Electroric co.,ltd. is an incustrial entity that is involved in developing and manufacturing quartz crystal resonator of various models and specifications.tel:86-20-32068136fax:86-20-32068201ZGC Electronic CO.,LtdZGC Electronic CO.,Ltd

Topic by zhenggong 12 years ago


My Red Crystal Star Pendant, with tutorial to share too!

Hi All,I just finished drawing out the tutorial for this beaded red crystalstar pendant - sort of using the beaded bead beading technique.See the free tutorial at:Pendant Tutorialthe finished photo of my pendant:PhotoThanks for looking!

Topic by beadangel 10 years ago  |  last reply 10 years ago


I want to make clear and green tinted kryptonite crystals out of liquid acrylic resin. Mold making?

 I want to make them like the movie crystals, about 8-9 inches long . I don't know how to make a mold or what to make the positive from before I make the actual mold to pour in the acrylic.someone said styrene sheets and bonds to fill and smooth.any ideas?

Question by darkside3131 6 years ago  |  last reply 6 years ago


PIC Internal Clock -- How accurate?

Can I trust a PIC's 4Mhz internal clock to keep accurate time over days of use? Or will I need an external crystal. I'm vary weary of that, as I'm going for a compact design. Thanks for the help.

Topic by zachninme 11 years ago  |  last reply 11 years ago


turn cable connections into wireless internet

Hey everybodyi just got this idea of making a wireless internet using ADSL (from cable form to wireless). There should be some cat5 cable connections. There are 8 pins in a cable, 4 of them are used: 1 pair for transmit (+ and -) and another for receive (+ ad -). I haven't experiment with this yet, but by connecting a crystal to the adsl, like transmitting music using AM radio, and connect a receiver, like most cd players that have abilities to receive am radio (perhaps solder the 2 wires from the speaker), this probably should work? Connect the same things to the computer, like the images below shown. So 2 crystals and 2 radio receivers are needed. Also, there should be 2 different frequencies, one for transmit and another for receive.Hope this would work. Any thoughts and comments are very welcome =]

Topic by J50Nunlimited 11 years ago  |  last reply 11 years ago


What on earth to do with box of RC helicopters? Answered

I just got a box of RC helicopters and parts. Its has 2 complete helicopters in pieces ( BIG ONES) a ParkFlyer step charger (?) a battery, a ratio, and a whole bunch of crystals and servos and wires and rotors ect. Even a carbon fiber cloth rod that the tail rotar attaches to.  *shrug* I don't know anything about RC helicopters, except that they are very difficult to even takeoff. What do I do now?

Question by nepheron 9 years ago  |  last reply 8 years ago


Simplest way to build a stopwatch (max 59 minutes and 59 seconds i.e, 59:59) without coding or programmable ics?

Hi,    I am trying to make a stopwatch that counts from 1 second to 59 minutes. Almost all the circuits that I've seen involves some kind of coding or programmable ics. But I don't want that. I'll be using a quartz crystal as my 1 Hz base and 4 individual 7 segment displays ( 2 for seconds and 2 for minutes). I know how to use decade counters to count till 60 seconds but I need help for turning 60 seconds to 1 minute and reset the 7 segments that represent seconds. In a nutshell, I would like to know how to change 00:59 to 01:00.  A counter that updates after every six "inputs" could solve everything. A link to a a circuit diagram would be helpful too.

Question by Adarsh_tronix 2 years ago  |  last reply 2 years ago


How can I make a small TV using a small LCD screen? Answered

I have a movie project idea that requires the use of a prop with one heck of a twist. Im trying to make a "Crystal Ball" that can project a movie from the inside of the ball, and I need to find some way to make it work without the necessary use of any tv or usb cables, even though it can use them. (Ex: in one shot, the actor is holding the ball, and is visible from head to his waist, but there are no cables running from the ball) So it could use video data from an SD card or a USB and also be used as a TV. The largest ball I can find is a 3" diameter clear plastic craft ball from a nearby hobby shop in a neighboring town. I guess what im asking in a nutshell is "how small can you make a diy projector?" Any help with this will be greatly appreciated!

Question by EngineerJakit 7 years ago  |  last reply 7 years ago


how to solve external crystal problem in pic16F and its capacitance

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 4 years ago  |  last reply 4 years ago