X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X

         -= PHONE GADGETS =-

          Conference Caller
             Hold Button

                 by
       -- anonymous wizard --

X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X

     >>>  Standard Disclaimer  <<<
Anything you connect to the phone lines is *supposed* to be FCC registered, to make sure it won't injure repairmen or damage equipment.  The gadgets des-
cribed in this file do NOT apply any extra voltage to the line, and should be safe.  If in doubt, check with the phone company before connecting any stuff to y

X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X

          CONFERENCE CALLER

If you have two phone lines, you canthis simple attachment to set up your own conference calls.  You'll never pay to have an operator set them up for you again
All three of you can now talk to each other.

Phone lines carry voices as audio frequencies superimposed on DC control voltages (around 40-50 volts when not in use, with higher pulses when ringing; around

The two lines can be connected through capacitors, so the audio passes between the two, but the DC voltages don't interfere with each other.  (If you simply sh

Use this simple circuit:

             ! !
 red --------! !---o: o------ red
             ! !    :
(line 1)            :      (line 2)
             ! !
green--------! !---o  o------green
             ! !
              ^     ^
       capacitors  DPST
       .1 to 1 uf  switch
    (not critical)
(do *not* use polarized electrolytics!)

(This circuit is similar to the other conference caller mentioned on the Roman Forum, which doesn't have the capacitors.)

X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X<>X

             HOLD BUTTON

This gadget also is a variation on one posted on the Roman Forum.

Shorting the line is not a good idea.  A resistance of 1-2K is enough to hold the line, without making the line look screwed up to the phone company.


red ------o  o----\\\\------ green

          SPST    1-2K
         switch

(It doesn't matter which direction you connect this circuit in -- red-to-green and green-to-red both work.)

If you like, you can add an LED that will light whenever you have someone on hold.  Just connect the LED in series with the switch and resistor (now about 500


                          !\ !
red -----o  o----\\\\-----! >!--- green
                          !  !

       SPST sw. .5-1.5K    LED

This circuit (with the LED) only works if it's connected in the right direc-
tion.  Phone wiring isn't always done right; before you wire this one in permanently, try switching the red and green wires, and leave it in the direction that

                ENJOY!

X<>X<>X<  anonymous  wizard  >X<>X<>X

Disclaimer: The file contained in the box above or displayed in a separate window from a link in the box above is NOT owned nor implied to be owned by BeYoND THe iLLuSioN. Most files at BeYoND THe iLLuSioN are originally from public Bulletin Board Systems (BBS) which were popular in the days before the Internet or from gopher, web, and FTP sites from the early days of the Internet which no longer exist today. Essentially, all files were acquired from the public domain in one for or another.

However, there have been occasions when copyright protected material has appeared on BeYoND THe iLLuSIoN without permission of the copyright holder. In these instances, we have and will continue to remove the copyright protected file as soon as it is brought to our attention. This can now be done using our Report Copyright Material form. Fill out the form, and the webmaster will be notified of the situation.

There are also times when files found on BeYoND THe iLLuSioN have a real home somewhere else on the Internet. In these instances, we will gladly replace the file with a link to its true home whenever it is brought to our attention. If you know of the true home of any of these files, you can use our Report Original URL form to bring it yo our attention.