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156 lines
8 KiB
Text
156 lines
8 KiB
Text
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==Phrack Inc.==
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Volume Three, Issue Thirty-five, File 9 of 13
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////////// //////////////////////////////////////
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// C // // //
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// r // // A U T O - A N S W E R I T ! //
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// e // // //
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// a // //////////////////////////////////////
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// t //
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// e ////////////////////////////////////////////
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// d B y : T w i s t e d P a i r //
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////////////////////////////////////////////////////
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Many times I've wanted to be able to start and/or listen to devices at my
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home when I'm somewhere else. I've developed the following circuits to do this
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for me. The circuits have all kinds of uses. I'll let your mind ponder the
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endless fun activities you can have. Some of the things I have used them for
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are monitoring my own house, tape record my friends for fun without their
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knowledge, or listen to a radio station when you're out of town, etc.
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///// Automatically Answer a Phone /////
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This has got to be the best way to automatically answer the phone. With
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just 2 parts, we can couple an audio source into a phone line. The cost will
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be less than $5 no matter where you get the parts!
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. . Radio Shack
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. . / ECG 6412 273-1374 Transformer
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Red __ __ Diac /
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(+) O-------------I\ /I------------) || (---------O <-
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Tip . \ / . ) || (
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._\____/_. ) || ( Audio Source
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. . ) || ( feeding IN
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Green ) || ( to transformer
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(-) O-------------------------------------) || (---------O <-
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Ring
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The "Diac" or "Bilateral Trigger Diode" looks like an open circuit until a
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voltage of either polarity is applied that is above its threshold of 63 Volts.
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(plus or minus 7 Volts) When this voltage is exceeded, like when the line
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rings, the device acts as a switch and goes into conduction. This "answers"
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the phone and holds the line through the transformer, which couples the audio
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to the line.
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When the caller hangs up, most telephone companies provide a momentary
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reversal of Tip and Ring which causes the Diac to stop conducting and release
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the line.
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///// Another Way to Automatically Answer /////
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For those who want to really play with this circuit, I suggest the
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following additions. I have added a bridge rectifier and an optical coupler to
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the circuit. The bridge just makes sure that the LED inside the optical coupler
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gets the proper polarity. If you are careful to observe polarity when
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connecting to Ma Bell, you can leave out the diodes and save a little money.
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. .
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. . Radio Shack
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|----------|-----------------__ __---------------| 273-1374
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| | .I\ /I. | Transformer
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--- --- ._\____/_. |--) || (-----O
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\ / \ / . . ) || (
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--- --- ECG 6412 ) || ( Audio
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O---| | Diac ) || ( Source
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Tip | O----| 1N4003 Diodes ) || (
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(+) | Ring | ( 4 ) |--) || (-----O
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--- (-) --- ECG 3045 Optical Coupler |
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\ / \ / ______________ / |
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--- --- | | |
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| | 2 | |\ | | 1 |
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-------------------------------| \|------------------|
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| |/ | |
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| \ \ |
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| v v |
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| ________ |
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| / \ |
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| V \ |
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|___|______|___|
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4 5
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Pins 4 and 5 on the optical coupler can be wired to remotely start a
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device upon answering the line. An example would be a tape machine or battery-
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powered bugging amplifier. Be careful not to connect anything over 25 volts to
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pins 4 and 5 to avoid frying the opto-coupler. Either circuit will accommodate
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an extra LED that could be used as a status indicator. Just be sure to keep
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the polarity proper and put it in series with the other components.
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The Audio Source can be almost ANYTHING. If you want to hook up a
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microphone as the Audio Source, connect the microphone to some kind of
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amplifier first, then to the transformer.
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///// An Interesting Catalog to Read Through /////
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If you really want to get fancy, you could consider ordering a free
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catalog from Monroe Electronics. They sell the following products you might
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wish to play with. Use these as building blocks to make whatever you need...
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DTMF Decoders (a) Which provide a momentary or latching relay
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------------- output for the duration of time the DTMF digit
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is being pressed. (If you're really obnoxious,
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you'd use one of these with one of the above
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circuits. Then you could call and randomly turn
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things on and off like maybe a TV scrambler/
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jammer.)
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(b) Which can accept multiple digits and be programmed
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for a momentary or latching relay output. (Use one
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of these to make a DTMF combination lock for your
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BBS. Or use as a call screener, i.e. only the
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correct DTMF sequence could make your phone actually
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ring)
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(c) Which can control access by a 4 digit code to latch
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a relay, then a single digit to unlatch it. (A
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little bit more sophisticated than (b) above.
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DTMF Encoders Which can convert BCD to DTMF tones. Crystal-
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------------- controlled, of course. 600-ohm audio output.
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(Use one of these to convert your computer's
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output into ANY DTMF tones of your choosing. You'd
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be able to choose the duration as well! Then this
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circuit would couple your evil DTMF into the phone
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line)
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Audio Detectors Detect BUSY and DIAL TONE and operate a relay.
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--------------- (Useful when making scanning hardware/software
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applications)
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Audio Generators Generate Ring Tone, Dial Tone, Busy Tone, Tone
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---------------- Burst, etc. (Start your own phone company. Fool
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your friends, trip out the operator)
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Dial-up DTMF remote control systems which can be used to control and
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monitor remote relays and status inputs at unattended sites.
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They can also provide automatic dialing of stored phone numbers to
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report status of inputs, and can make use of an internal timer to
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execute control commands. (Water strange plants by call-in remote
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control, check moisture levels, see if a certain mailbox is empty
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or full, have the mailbox CALL you when something is delivered,
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etc. Do I have to tell you everything? Just get the catalog!)
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Their address is:
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MONROE ELECTRONICS, INC.
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100 HOUSEL AVENUE
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LYNDONVILLE NY 14098
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(716) 765-2254
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//////////////////////\/\/- T W I S T E D P A I R-/\/\////////////////////////
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_______________________________________________________________________________
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