_______ /*******\ ________ /**** ******\ ________ (____ )\ /* V * M ******\ /( ____) \***) /__*\ /* o r e ** n *\ /*__\ (***/ \/ /*( ( \*\/** i e B n *i x **\/*/ ) )*\ \/ / /**/ /__ \*** c x Y t j ***/ __\ \**\ \ / /**/ /*( ( \ \* e i * a i */ / ) )*\ \**\ \ / /**/ /**/ /* __\ \* * M *** l H**/ / __ \ \**\ \**\ \ ( (**( (**( (**( (**\ \**** ***** */ /***) )**) )**) )**) ) \ \**\ \**\ \**\ \***\ \*********/ /***/ /**/ /**/ /**/ / \ \**\ \**\ \**\ \***\ \*****/ /***/ /**/ /**/ /**/ / \ \**\ \**\ \**\ \***\ ~~~~~ /***/ /**/ /**/ /**/ / \ \**\ \**\ \**\ \**( DRZ )**/ /**/ /**/ /**/ / \ \**\ \**\ \**\ \*\ /*/ /**/ /**/ /**/ / \ \**\ \**\ \**\ \(_)/ /**/ /**/ /**/ / \ \*) ) *\ \**\.0. /**/ /* ( (*/ / \__/ *\ \** **/ /* \__/ \ \**/ / \~~/ ~~ In today's world you have to be careful what you say and to who you say it. You can't trust anyone. Like they say, everyone has a price tag. Shifty eyes and easedropping ears are everywhere. Secrets and unknowns abound in this information ridden society. There is no escape...until now. Well, sort of, you see the topic of this phile, the voice mixer, is more accuratly described as a sound scrambler/descrambler. It allows a normal sound to be inputted for scambling, and a scrambled sound to be inputted for descramblization. This eliminates the need for separate scrambler/ descambler units. I was going to call this thing a VOX.BOX but first off VOX has already been established as a voice regognition circuit (Used mostly in Auto-On cassette recorders). And secondly because, well boxes have become a thing of the past and are seen today as mostly jokes (Tis' a shame...) So I just settled with Voice Mixer, lame name I know but it follows along with the rest of my ill named pieces. Ever notice that people that drive 45 mph on the freeway are either : A) Old and wrinkly B) Oriental or C) Have a 'Jesus Luvs U' sticker (Or reasonable facsimile) on thier cars somewhere (They usually miss the bumber amazingly enough - could this be a sign of their mental competence) I dunno, just an observation. Some tips for a safer, more happy lifestyle: 1) Don't have sex with a woman while she is wearing Stilleto heels 2) Don't suck the plastic (Don't worry no one else understands either) 3) Don't attempt to do any but the most basic computer functions (Like turning it on and off) while having sex 4) Remember to always check the lid BEFORE you decied to shake it up 5) Crime does pay 6) Cheaters always win 7) Never and I mean Never let Whip-Cream residue stay on your body or clothes for more than 2 hours, and last but not least 8) Aggressive behavior is the key in today's society, trust me. Ever notice how these paragraphs seem to be straying farther and farther away from the topic of this phile with each succeding one? Ever notice that I don't make much sense? Ever get the feeling you're being watched? Ever wonder...? =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Aw, hell I must be getting old, I'm running out of ideas for those text grafix headers, I ramble on in phile intros, I'm starting to use 'ph' again (Someone save me!) Aackk! I'm doing it again, damn I'd better just jump right in before I go off on a tangent again, so here it is: =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Ok, I'll give you the parts list first, then some explaining, then the circuit diagram, and then the usage. So gather this stuff up and meet me in step II. I. MATERIAL ~~~~~~~~ Resistors : R1, R2 - 1,000 ohm R3 - 10,000 ohm R4 - 10 ohm R5 - 25,000 ohm potentiometer R6 - 10,000 ohm potentiometer Capacitors : C1-C5 - 0.1 uF, ceramic disc C6 - 0.27 uF, mylar or similar C7 - 0.039 uF, mylar or similar C8 - 0.05 uF, ceramic disc C9 - 100 uF, 16 WVDC, electrolytic C10 - 220 uF, 16 WVDC, electrolytic Semiconductors : U1 - NE602 low poer VHF double banded mixer, integrated circuit U2 - LM567 tone decoder, integrated circuit U3 - LM386 low power, audio amplifier, integrated circuit Misc. Parts : SPKR1 - 4 or 8 ohm speaker T1 - 1,000 ohm to 8 ohm audio transformer CLIP - 9 Volt Battery clip IC Sockets for Semiconductors Solder/Soldering Iron Wire Optional: Perfboard, enclosure, knobs II. EXPLANATION ~~~~~~~~~~~ Ok, this project is centered around the NE602 chip made by Signetics. It's got an on board oscillator, which will operate up to 200 MHz, a differential input amplifier, and a voltage regulator. The chip layout goes something like this : NE602 Chip ______________________________________________________ 1 |Input A ____________ Vcc| 8 -----|--------+ |Voltage Reg.|---|----- 2 |Input B | |____________| | -----|----+ | ____________ | | _|___|_ | | | 7 | \ /Differential +-----------| Oscillator |---|----- | \ / Amp ___|___ |____________| | 3 | | \ /Buffer | | 6 -----|GND | \ / Amp +----------|----- | |________________ | | | | | | | (***)Mixer | 4 | Output A | | Output B | 5 -----|-----------------------+ +----------------------------|----- | | |______________________________________________________| Just by looking at this you can pretty much basically tell what's going to happen. Sound input from Inputs A & B will be coupled with the output of the Oscillator in the Mixer and then sent out the Outputs A & B. Thus resulting in a scrambled sound. But, you ask, how does that make a sound scrambled? Well, let's first take a look at some sound waves before and after scrambling. Ok, let's pretend that this wave pattern is the sound of someones voice: (Which it's nowhere close but let's pretend for ease of visual aid) ** ** ** ** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ** ** ** As you can see the waves rise and fall, as waves do. Now let's assume our Oscillator output wave looked like this: oo oo oo o o o o o o o o o o o o o o o o o o o o o o o o oo o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o oo oo oo oo Hmm, looks pretty much the same, huh. But if you'll notice this wave starts with a trough, or low spot. Where the former example started with a crest, or high spot. Now supose these were fed into the NE602 Chip. They would be mixed together, sent out the output, and the resulting wave form would look something like this: ** oo ** oo ** oo ** * * o o * * o o * * o o * * * * o o * * o o * * o o * * * * o o * * o o * * o o * * * * o o * * o o * * o o * * *o * o * o * o * o o * * o o * * o o * * o o o o * * o o * * o o * * o o o o * * o o * * o o * * o o o o * * o o * * o o * * o o oo ** oo ** oo ** oo This produces a totally different wave form, which means a totally different sound. It does not just sound like the two waves played at the same time. Even though it might look that way with the voice wave made of '*' and the oscillator wave made of 'o', I just did that to show how the waves interacted. In reality all lines would be made of the same character, thus creating a new scrambled sound. Now that we've got sound interaction down, let's take a little deeper look into the workings of this project. The Input sound is ported directly into the NE602, boosted by the differential amp, and is then sent to the Mixer to await the scramble code. The scramble code comes from the LM567 tone decoder, which operates as a carrier oscillator supplying a 2.5kHz to 3.5kHz audio square wave (Square waves look like: ~~|__|~~|__|~~ in comparison to the waves in the above diagrams) to the Oscillator Input (Pin 6) of the NE602. The Resistors, R2 and R3 make up a voltage divider on the way from the LM567 to the NE602. This furnishes a square wave signal of about 600 millivolts peak-to-peak to Pin 6 of the NE602. This is sent through the Oscillator on to the Buffer Amp and then onto the mixer where it is mixed with the Input sound. After mixing the scrambled sound is sent out through Pins 4 and 5. These are coupled through the Transformer to create a balanced output, for maximum attenuation to the input and local oscillator signals. From here the signal goes to a LM386 audio amplifier, where it is boosted enough to drive a small speaker. Remember, that this amp can only drive a small speaker. If you have problems with volume or clarity, check the size of you speaker. All this is powered by a 9 Volt battery. Now that, that's out of the way let's move onto... III. CIRCUIT DIAGRAM ~~~~~~~~~~~~~~~ |------*---------------------------------------*----------*-----------> To +9V | | | +| CLIP | > | _|_C10 | < R1 _______________________ | /|\ | > | | | | | | | _|_C3 | _|_ | |---* | /|\ | = | _|_C4| | | | | /|\ | | | | | _|_ | | _____ T1 ____ | | | = |8 |6 |5 \ / | | | /| | ___|______|__|_ ()II() < | 3 |\|6 __/ | | | U1 | ()II() R6 ><-)------|+ \ C9 | |S | | |_______________| ()II() < | 2 |U3 >----*------|<------| |P | | |1 |2 |3|4 1K()II()8ohm | | |---|- / | |----| |K | | _|_C6 _|_C5 | |____/ \ | | | |/ |4 > | |__|R | | /|\ /|\ _|_ | | | *------| < R4 _|_ \ | | | _|_ = *---| | _|_ > = \| | | = _|_ | = _|_C8 | | AF = | /|\ | |____o In | _|_ | ____o (100 to | = | _|_ 200 mV | | = P-P) | | C7 R5 | | |----*--|<--*--\/\/-- | | _|_ | | | | | = 7| 6| 5*------| | | _|______|____|_ | | | | U2 | > | | |_______________| < R3 | | C1_|_ C2_|_ | | > | | /|\ /|\ | | | | | |1 |2 |3 |4 *---| | |-----*---* | | | _|_ | > | = | < R2 | | > |___________________________| | _|_ = Ok, that's the layout. You should be able to make out most objects by the coresponding letter/number code by each. For example C7 is by object |< so looking back at the material list you know that |< must be the 0.039 uF capacitor. But just in case I'll give you a breakdown. Note that numbers by themselves indicate Pin numbers off the semiconductors. So without further ado : _|_ > /|\ = Capacitor < = Resistor > |< = Capacitor \/\/ = Resistor _|_ = Ground = ___o = Audio Input * = Wire Connection \ / ()II() = Transformer ()II() __ /| / \ | | | = Speaker |__| | _______ \| |_______| = Semiconductors Also note that the line coming out of Pin 6 of U1 that goes to U2 is NOT connected to the output of the transformer, this is show by the ) sign across that wire. And wires that come to an end like this -------| are not a dead connection at the top of the vertical line | it just looks that way because that's the only way to do it in ASCII. One last thing to mention is that the * is a connection of all wires passing through the * mark. Now that it's built you can put it in an enclosure box, add some knobs, and make it look like a pro job, but that's optional. Well, that should do it for the diagram explanation. Once it's built move onto... IV. USAGE ~~~~~ As you'll notice, the voice mixer has two pots (potentiometers) attached to it. This allows for volume control (R6) and for oscillator frequency control (R5). The volume control is pretty simple, it controls how loud the output is (Duh?). The oscillator frequency controls the speed of the waves created by the tone decoder. This in turn sets the frequency rate of the oscillator. And what does all that mean? Well, it means that you can further secure your scambled messages. Let's say you have a message that was scrambled with the R5 pot set about halfway. Now that message could not be descrambled unless the R5 pot is set back to R5. Now to use this thing you simply hook up an input source (i.e.: microphone, tape recorder, ect.) to the input wires. (You could also install an RCA or similar audio jack to these wires to facilitate ease of use) Plug in the battery (Again you could add a simple SPST switch here to turn the power ON/OFF) and let the audio flow. You should here scambled output through the speaker connection. If you don't, turn the Volume Knob (R6) to see if that helps. If still nothing, check all your connections and make sure all components are properly located. Check the battery, the speaker size (As stated earlier), and your input device. After you can hear the scambled output you can alter it's frequency with the Oscillator Frequency Knob (R5). Again this works sort of like a password to your scambled messages, to personalize them. Now to descamble messages you simply feed a scambled sound into the audio input. So, you're talking into this machine and coded messages are coming out, now what good is that? Well my friend, let me explain. First, for anyone to understand your messages they must also have a similar Voice Mixer. Or messages can be recorded on a tape cassette and played back through to get the unscrambled message. There is an unlimited amout of things you can do with this as long as the person you want to recieve your messages also has a Voice Mixer. Such as: Phone - There are two ways to incorporate the Voice Mixer into your phone line. You can either splice it in or use the acoustic coupler method. Splicing provides better results, and less noise but does require some modifications to your phone. (Look Ma, no 'f'ones) To slice it, open your phone and find the two lead wires that come from the microphone part of your phone. They are usually red and green but these are NOT the same as the ring and tip wires that exit the phone. Make sure they are the wires coming in from the handset, and that you splice them BEFORE they enter the phone circuitry. Ok, you've got the right wires, now cut them and strip some of the insulation off. Connect one end of these wires to the audio input of the Voice Mixer and the other ends to the wires that go to the speaker. You simply remove the speaker for this application. Now tape the wires up and reassemble the phone. If you're using one of the older desk phones there should be plenty of room to mount this inside the phone itself. But if you do it's a good idea to install an ON/OFF switch on the Voice Mixer, also be sure to run the Knobs to the outside of the phone so you can adjust them without having to open the phone. Ok, side one is done all that need be done now is install a unit in your freinds phone so you can communicate. Once both units are in place, make a call to your confidant and switch on the Voice Mixer. Make sure you are both operating on the same frequencies. You should be able to talk freely and hear you friend clearly, but anyone else listning on an extension or tap, even the operator will only hear the scrambled sound. Neat-0 huh? The only problem you might have is the volume levels. You see a phone sends back a small amount of input from the microphone back into the reciever, this is so that you can tell how loud you are speaking and don't end up shouting at the other party. So you might get a little of your scrambled tone back in your earpiece, or you could be speaking to loudly or softly to the other party. Mess around with it a few times and you get the hang of it, adjust volume levels with the Volume Knob. The acoustic coupler method, is simply sticking the speaker of the Voice Mixer up to the microphone of the phone. Then to receive information you have to stick the microphone up to the earpiece of the phone. With this techinque you get a lot of background noise, plus it's a real hassle to deal with holding up the speaker and microphone, and switching between the two. But it can be done, if you don't want to splice into your phone. BBS - Add super secrecy and encoded eliteness to your board. Splice up the Voice Mixer to your line and only users with similar Voice Mixers and correct frequency setting will be able to legiablly log on. I must admit here that I haven't messed with this particular mod, because I haven't had the desire to re-setup my remote system and go through all the BS of setting up a BBS. But in theory this should work. VMB - Leave scambled greetings on your VMB's or answering machines or whatever sound devices you have. Office - Set up a high security system in your business by implementing the Voice Mixer into the office intercom system. Radio - Use the Voice Mixer to broadcast private radio transmissions, and not arrouse FCC suspicion. Or scramble your HAM Radio messages. Bugs - Put the Voice Mixer in with a bugging device (Don't forget to remove the speaker...hehe) and have totally private eavsdropping. This eliminates anyone 'accidently' monitoring your FM bug. Simply hook the Voice Mixer between the mic and the transmitting unit, removing the Voice Mixer speaker. Cellular-Hook up a Voice Mixer to your cellular phone to provide security for your confidential phone conversations. (See directions under 'Phones' above) Now no one can monitor your ever so accesable cellular air waves. All modifications above are to be connected either between or in place of the speaker or transmitting unit of the module to be modified, unless otherwise stated. There are lots more mods you can make, these have just scratched the surface. Any sound can be scrambled, including music. So build a few and check them out. Brought to you By: ThE DeEp ReD ZoMbIeS <*>==)A Killer Kult Production(==<*> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Copyright 1991 - Jinxy Boy Publications - Member FDIC - Mental Hijinx : Whoopie =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= So ends another phile, hope you enjoyed. Look for more electro gizmo's coming your way soon, from me and the DRZ. And maybe a reprise of 'Dragons Touch', but only time will tell. Any questions? Any comments? Well then get in touch with me, drop me some mail. Just look around I'm sure you can find me some- where. Be seeing you...and remember:rip and tear------------------------------ tear and rip----------------------------- bloody bitch---------------------------- done did a flip------------------------ can't cool down----------------------- can't heat up------------------------ can't get outta--------------------- this damn cup---------------------- life sucks------------------------ this is true--------------------- take thier shit----------------- take thier doo----------------- in their face----------------- with the goo----------------- some say i------------------ make no sense-------------- that's just cause--------- they're so dense--------- now i must end---------- my little song--------- and if you don't------ like it you can------ suck my dong-------- rude and vulgar i-- may be but you---- still have to---- put up with me-- though you----- rant and------ though you--- rave i know- that's----- what you-- really--- crave--- nomo'-- rhyme- nomo' time l8r U- -