| Author | Message | ||
     Anonymous |
hey, its me again the KID from the bronx, i wanna make that AM radio transmiter but i dont not have the one (megahertz crystal oscillator) but i do have many old radios and circuit-boards laying around, what house hold appliance whould i be able to take that crystal oscillator from? | ||
| Simon Quellen Field (Sfield) |
You'd have to look inside each appliance for it. I would not expect them to be that easy to find. That is why we carry them in our catalog. | ||
| Anonymous |
i opened my old cable box and found what looks like a crystal oscillator the only difference is the one i found has all the pins (4) in one row. which wire would go were? | ||
| Simon Quellen Field (Sfield) |
It seems unlikely that what you found is a crystal oscillator. What are the markings on it? | ||
| Anonymous |
yea, {T 6D JPN} {F88SM } | ||
| Simon Quellen Field (Sfield) |
That is a Surface Acoustic Wave Resonator, not an oscillator. It will not work as an AM transmitter. | ||
| Elijah Unregistered guest |
How do you build the AM transmitter with a different frequency so if you make more than one pair there is no interference? Oh and what materials can the signal go through? | ||
| Simon Quellen Field (sfield) New member Username: sfield Post Number: 118 Registered: 12-2004 |
Just use an oscillator with a different frequency. You will still want to chose a frequency your receiver is capable of receiving, such as 1.5 Mhz. Radio waves at these frequencies go through most non-conductive materials, such as wood, glass and plaster. They will not go through metals, and concrete such as in bridges, or rock and dirt, nor will they penetrate water very far. | ||
| Tristan Unregistered guest |
Hi, I am sort of a new comer (First post). But I do a lot of electronics and the like. It is somewhat difficult to construct transmitters from old radios. I have made several different transmitters before, (Some that can change frequency through a switch and a couple ICs.) without the 1MHz oscillator. A 555timer IC works great. But that matters if you are up to getting the components and (If you don't have one) soldering iron, along with some solder ofcourse. If you don't have a soldering iron or the components and don't want to pay 20$ for all the stuff. Then send me an E-mail. I can give you some hints on how to do it without that stuff. I have an Idea on how you can do it with a radio or somewhat. I can't give you any promises, but I'll do what I can. (Hint of advice, If you send me a E-mail. Type 'Transmitter help' or something like that into the Subject box or I'll probably delete your mail by accident.) I've been trying to make a voice transmitter but I can't quite work the bugs out of my design. If anyone has any pointers, I would be pleased if they would share. | ||
| Alessandro Carcione (alessandro) New member Username: alessandro Post Number: 29 Registered: 2-2005 |
That sounds very interesting, could you e-mail me some circut diagrams of some of the transmitters you have built?, I have a big stock or eletronic componets and tools so that is not a problem. Thank You | ||
| tremmel Unregistered guest |
All great but how could i make an fm radio transimitter??????? | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 410 Registered: 12-2004 |
Do a Google search for "simple fm transmitter". | ||
| Anonymous |
hiiiii i m a newcomer with a lot of confusion abt circuitry desinging. And i m in search of a technical support. i m having an SMPS & i wanna interface an alarm population system in it so that before discharing level alarm starts ringing &user comes to know that. My problem is how to make it a realty. i m having some idea, as if we use 555 timer ic or comparators for that purpose but i m not sure wheather its right or wrong,so please help me | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 578 Registered: 12-2004 |
Please take a little more time and care in presenting your problem so that we can understand what you are talking about. I assume you are talking about a Switch Mode Power Supply, since having a Society for Marketing Professional Services doesn't fit the context. You are in the process of having one. This sounds like you are giving birth, like my cat is having kittens. So, in the process of giving birth to a power supply, you would like to connect an alarm to it. I don't know what you mean by "alarm population system", but let's assume you mean something that makes noise. You want this to happen when some event relating to the power supply happens. You refer to this event as a "discharing level", but I assume you mean "discharging", because although power supplies don't discharge, there is even less probability that they will unburn. As for converting the idea into a real estate agency, I can't help much, but if you want an alarm to go off when a voltage exceeds some trigger level, I may be able to point you in the right direction. A comparator is a device that turns on when one of its inputs reaches or exceeds the voltage level of its other input. The output of the comparator can be used to turn on or power an audio oscillator connected to a speaker or piezoelectric element. The audio oscillator can be made from a 55 timer integrated circuit, or from a transistor or an operational amplifier. You can Google for "comparator circuit", and "alarm circuit" to get ideas. | ||
| tan if (Tano) New member Username: Tano Post Number: 1 Registered: 3-2006 |
AM transmitter is simple but if there was any schematics here showing how to build the oscillator manually with parts, that would be more better. I can't find any oscillator to purchase in my country and costs too much for me to order from this site. | ||
| Alexander N Roberts (Whoo_mythbusters) Advanced Member Username: Whoo_mythbusters Post Number: 66 Registered: 9-2005 |
Yes you can build an oscillator from parts I have a kit from radio shack that shows you how but if built from parts the oscillator is really unstable If somebody else sees this and already has the circit on your computer please place it on here If not I can get it out of the book and get it on here eventually. | ||
| Ross Turch (Ross) New member Username: Ross Post Number: 1 Registered: 5-2006 |
I tryed to make it from your tutorial, I couldn't find a 1 Mhz oscillator, so I got a 1.8 mhz oscillator, and I used part number: 671-8001 from midcom as the transformer, I'm not sure if that is the right part. Oh and it didn't work, Do you know what station it's on? | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 1229 Registered: 12-2004 |
Your AM radio can't tune that high. It only goes to 1600 khz or perhaps 1750 khz, and you are transmitting at 1800 khz (1.8 Mhz). We offer the 1.0 Mhz oscillator in our catalog. | ||
| Victor J Wedel (Victorw) New member Username: Victorw Post Number: 1 Registered: 3-2009 |
WOULD LIKE SOME HELP AND A FEW SUBJECTS: I would like to take a sound sample, actually two sound samples and modulate the two signals (nonlinearly mix) to a reciever (am radio) I like the idea of using a crystal type as opposed to transistors, etc......I had read somewhere that you would use as AM Transmitter that can take. Would the kit you sell work? Also, can i send to audio signals into? could I send these two audio signals to two speakers, Left and Right? Thanks so much, VW | ||
| Victor J Wedel (Victorw) New member Username: Victorw Post Number: 2 Registered: 3-2009 |
AM TRANSMITTER TO A STEREO AMPLIFIER... Would the stereo amplifier kit you sell work with the (am crystal radio)? Would i connect the stereo amplifier to the am crystal radio and then the output to my 2 speakers? Thanks so much! VW | ||
| Victor J Wedel (Victorw) New member Username: Victorw Post Number: 3 Registered: 3-2009 |
TIMER: What I want to do is control a few lights, possibly LED's or a Xenon bulb if I can find one...with a timer...it is important that the timer can go on for 4 seconds and off for 4 seconds and then on for 4 sec, off for 4 sec..I would like the timer to work for about 30 mins or so... What would be the best timer to use? Thanks again very much. vw | ||
| Victor J Wedel (Victorw) Junior Member Username: Victorw Post Number: 4 Registered: 3-2009 |
Audio to Light: Would like to take an audio signal and use this to activate a light, LEDs, Xenon...what kind of audio signal do you need to activate so a light would come on? Thanks much, VW | ||
| Victor J Wedel (Victorw) Junior Member Username: Victorw Post Number: 5 Registered: 3-2009 |
WOULD LIKE TO TAKE AN AUDIO SIGNAL TO TURN ON A LIGHT, XENON BULB, OR LEDs... what type of audio signal work best to activate a light? Does the Xenon flasher have pure xenon in it...Ideally I would like to activate a glass bulb filled with Xenon... any help would be greatly appreciated. Thanks much, va | ||
| Theresa Simmons (Theresa) Senior Member Username: Theresa Post Number: 108 Registered: 1-2008 |
Generally you don't want just any noise to turn on your light. You want some sort of encoding (even The Clapper looks for a specific sequence of sharp sounds). Look into Tone Decoders. They listen to audio, and watch for the same dual tone frequencies that are used in tone telephone dialing. You get to choose which of 16 distinct tone pairs you want to trigger on. A xenon photoflash tube is indeed filled with xenon, sometimes with a few other gases as well. They want about 600 volts to flash, and are triggered with a pulse of a couple thousand volts to start the arc. The easy way to work with them is to buy a disposable camera (which has all the circuitry in it already) and use a 4066 CMOS switch to replace the mechanical switch. The 4066 can be triggered from the tone decoder chip. Of course LEDs are much simpler. The tone decoder can light one up directly. If you want a timer, look at the 7555 chip. There are thousands of circuits based on it all over the web and in books and magazines. It's really easy to work with, cheap, and very popular. I don't think Simon has a stereo amplifier circuit on his pages. Most of the stuff he works with is strictly monaural. But his amplifiers will amplify the AM radio just fine (it's monaural). To mix audio, all you need is a couple resistors. Google for something like "simple audio mixer circuit". The transformer trick will work, but why bother when two resistors work fine? To nonlinearly mix them, use a diode. Google for "diode ring modulator". |
