Circuit #1:
 Black Box with PushButton and MouthPeice Amp...
 Neg.                    RED    ______
 o___.___._||5mfd__.____________|     |
     |   | ||      |            |  P  |
     |   |         /  240 Ohm   |  H  |
     |   |________o o__/X/_.    |  O  |
     |        Norm   Free  |    |  N  |
P.B. o                     |    |  E  |
    >                     ---   |     |
     .             6volts-----  |     |
     |                    ---   |     |
     |                     |    |     |
 o___._____________________.____|_____|
 Pos.                  GREEN
 This diagram can be interpreted as:
  P.B = Pushbutton
  The 6 volt battery can be replaced with either a 9 or 12 volt battery,
  if you do so, you must also change the resistor value to the following:
    Batt    Res. Value
     6v        240
     9v        360
    12v        480
 Make sure you don't use this on operator orignated calls. Otherwise
 this particular box plan is VERY VERY safe. When using it, after you answer
 the party will never know you are there, so you can screen calls that
 way .. work out a code with your friends who you'll allow to be Black
 Boxed, make it so they whistle while it is ringing or something so you
 know it's safe when you pick up to hit the pushbutton to kill the
 ringing. This is very important, if you DON'T hear the signal, DON'T
 black box that call! You can be nabbed if you mess up.
 Circuit #2:
  Put-Person-On-Hold

          PhoneLine
              RED
                                  PHONE
   ________     o      _________X
   |      |     |      |        /  RED
   |      |     |      |
   /     ----------------
   X     | DPDT SWITCH  |
   /     ----------------
100 ohm   |     |      |
1 Watt    |     |      |
   |      |     o      ---------> GREEN
  / X     |
  X /     | PhoneLine
  LED #48 |   GREEN
   or #49 |
   |      |
   |______|
 To activate Hold, switch DPDT.  LED will be on when Hold is on, and
 off when it is off.
  Here is a variation of the above schmatic, this facilitates the use
 of music to the person on hold:

          PhoneLine
              RED
  To Audio                        PHONE
 <_________     o      _________X
   |      |     |      |        /  RED
   |      |     |      |
   / 10   |     |      |
   XOhm   |     |      |
   /2Watt |     |      |
   |      |     |      |
 <_|      |     |      |
   |      |     |      |
   |      |     |      |
   /     ----------------
   X     | DPDT SWITCH  |
   /     ----------------
100 ohm   |     |      |          PHONE
1 Watt    |     |      |
   |      |     o      ---------> GREEN
  / X     |
  X /     | PhoneLine
  LED #48 |   GREEN
   or #49 |
   |      |
   |______|
 Circuit #3:
  Snoop Lite (Tap/Bug Detector)
 RED                            GREEN
 o________________________________o
  Phone          A            Phone
  Line    _____/X____
          |    X/   |
          |         |
 o________|__)!B____|_____________o
 GREEN    |    +    |          GREEN
          |  X     |
          -->|------|
            CX
 A - LED #48, OR #49
 B - 500 MFD/15 VOLTS
 C - 10 VOLT ZENER DIODE,1 WATT
 LED will shine brightly when Tap or
 Bug or Extension is lifted.