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- ──── Black Box Plans
-
- When your phone is just sitting there doing nothing, the voltage through the
- phone line is about 20 volts AC (Alternate Current). When someone calls and
- the phone starts ringing, the voltage jumps enough for the bell to work
- (about 48 volts) which tells Ma Bell to stand by if you should pick up so they
- can bill you. When you eventually pick up the phone voltage drops to 10 volts
- and the billing starts. What a black box does is it keeps the voltage at 36
- volts therefore the incoming caller never gets billed (INGENIOUS!).
-
- The original black box was created by an ex-Bell employee who went by the name
- "Captian Crunch". He got his name from those little whistles you got in boxes
- of Captian Crunch Cereal Because they emitted a tone that sounded like a pay
- phone. Captian Crunch announced his official retirement from phreaking after
- being released from a California jail on two counts of using blue boxes (the
- ones operators use).
-
- Materials: 1) A 36 volt zendr diode
- 2) A ceramic or mylar
- capacitor of 0.1 micro-
- farad.
- 3) A electrolytic capacitor
- of 1.0 microfarad.
-
- You can get all these parts at your local Radio Shack.
-
-
- First you have to open your phone up. You do this be gently removing the two
- screws on the bottom of the phone and lifing the cover up slowly. You should
- notice three wires coming in from the back of the phone, a green, red, and
- yellow most of the time though they can differ. Don't worry about the canlow
- wire, we will not need it to do this. You will need to find the more positive
- of the remaining two wires (almost always the green). Now connect the banded
- end of the zener diode to the more positive of these two wires. Now connect
- the other end of the diode to the red wire 'in-series.' You have just completed
- the first step. For the second step you need a ceramic or mylar capacitor of
- 0.1 micro-farad. You connect this 'in parallel' across the diode. This is
- needed to allow the diode to pass voice singnals. Now for the final step, take
- your electrolytic capacitor of up to 1 micro-farad with its + end connected
- to the banded end of the diode and the other end should be connect to the
- anode end of the diode.
- If the phone rings for about a half hour they will think something is wrong
- and bill you anyway. When using a black box your phone will continue to ring
- even though you picked up. You have to make a switch to connect to one of the
- ringer wires that will shut it off.
-
-