--- /dev/null
+\r
+ A SELECTIVE SWITCH FOR GETTING MORE COMFORTABLE SCANNING\r
+ written by Dr. Fraud\r
+\r
+ HI PHREAKS,\r
+\r
+ In thiz short article, I will show you an easy possibility to get a more com-\r
+ fortable way to make BB-calls and scannings. Most of you use one of the fol-\r
+ lowing ways to call:\r
+\r
+ 1.) U pick up the handset of the phone; you get a dialtone. Then, you dial\r
+ the number you wish to call. If BOXING fails, you hang up and try it\r
+ again...\r
+ 2.) U send a "HIGH" to yout LPT port. This causes a little circuit to open\r
+ the line. You get a dial tone...and you dial....\r
+\r
+ Of course, both of these methods are pretty nice...but here`s a better way to\r
+ get control over your line status:\r
+ Its possible to control the line with a little switch that always "listens"\r
+ to your soundcard`s output; if that switch recieves a tone of a certain fre-\r
+ quency (and you can tell the circuit what frequency this should be), it pro-\r
+ duces a "HIGH". This can be used to open/close a relais.\r
+\r
+ NOTE: There's a blueprint picturefile with this article, called BB-PLAN.GIF !\r
+\r
+\r
+ Question: Why do I need that circuit ?\r
+ Answer : Simple. Cause it`s comfortable and easy to use. Okay... before I\r
+ tell you more of that question/answer rubbish, you should take a\r
+ look on that phunny plan in that tiny GIF-picture. (BB-PLAN.GIF)\r
+ First, here are the materials you need to build up the switch:\r
+\r
+ C1= 2,2 uF\r
+ C2= 47 nF\r
+ C3= 100 nF\r
+ C4= 10 nF\r
+ P = 20 K\r
+ D = common diod, as e.g. 1N 914\r
+ IC= 567 (LM 567, NE 567 etc.) ...costs `bout 1$/piece...\r
+\r
+ You can build this thing any way you want... there are no critical values\r
+ you must pay attention for. Here are some electrical data:\r
+\r
+ - supply range: 4,75V to 9V\r
+ - supply current typ: 7 mA\r
+ - Input resistance: 20K\r
+ - smallest detectable input: 20mV (!)\r
+ - highest centre frequency: 500 KHz (!)\r
+\r
+ As you can see, the electrical data allow an universal use of that switch.\r
+ The resonance-frequency is defined as follows: Fo=1/(P*C4)\r
+ The band-width is the following: B= sqr(Ue/Fo*C4) ! NOTE: Depends on Ue !\r
+ It`s adjustable from 1% up to more than 10%. This means, that, if you adjust\r
+ it to 1%, a 1000 Hz tone will only be recognized from 990 Hz up to 1010 Hz.\r
+ If you use 10%, you will be able to send 900 Hz up to 1100 Hz to get a\r
+ response from the switch.\r
+\r
+ Question: How Do I use that phunny switch ?\r
+ Answer : Simple. Just connect it via a relais (ca. 5V) to your phone line.\r
+ The output voltage (pin 4+8) should be used to control the "prima-\r
+ ry" side.\r
+ Question: And then ?\r
+ Answer : Then you only have to move the trimmer until the relays "clicks"\r
+ when you send the frequency you want. Some dialers (e.g., the\r
+ latest SCAVENGER dialer) support that. If you wanna get off-hook\r
+ and on-hook again in an easy way, just connect that device to your\r
+ soundcard/phone line (Ue) and you will have a great utility to get\r
+ a phree line within about 2 seconds just by pressing a stupid little\r
+ key. The relais will stay open as long as that tone is recieved.\r
+ \r
+\r
+ Note for practical use: If you decide to use that system, you should pay at-\r
+ tention to the following advices:\r
+\r
+ 1.) The value of P depends on the frequency you wanna use. It`s useful to use\r
+ (haha...nice english) a frequency that is above the "normal" signalling\r
+ frequency (e.g. 3900 Hz.) \r
+ 2.) Depending on that value, the value of the poti can vary... just look for \r
+ a good frequency, get the correct value and use the correct resistor for\r
+ the poti. Sometimes, it`s more than 20K.\r
+ 3.) Avoid interferences. If you don`t, (e.g. you send a 3000/3001 Hz signal),\r
+ the behavior of the switch will get unstable. In fact, this can be also\r
+ quite useful (Analyst, u know...), but normally, it`s senseless.\r
+ 4.) Block your output. Sometimes, you connect your soundcard`s output with\r
+ any devices without checking whether they are potential-free. This means,\r
+ that if you connect your soundcard to the phone-line _and_ to that switch,\r
+ you may get a problem `cause your signal is not potential-free. Avoid that\r
+ while using a simple transformator. It costs about 2$ and really prevents\r
+ your computer from getting unexpected noise/voltage/damage.\r
+\r
+Okay... if you still don`t know the use of my tiny switch, then you are:\r
+\r
+ 1.) stupid\r
+ 2.) lame\r
+ 4.) stupid & lame\r
+\r
+Hmm...check it out... if you`ve got any problems, just contact me at L.O.R.E.\r
+BBS at any time !\r
+\r
+Greetz,\r
+ Dr. Fraud\r
+\r
+\1a
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