home *** CD-ROM | disk | FTP | other *** search
- -----------------------=======< Sanctuary >=======-------------------------
- Productions
- Presents.....
-
- (Reprinted, (c) 1990, 2600 Enterprises, Inc. Volume Seven, Number Three
- Autumn, 1990.)
- --------------
- Hellfire BBS - World Headquarters of Sanctuary 908-495-3926
- Ripco ][ - On its way to be as good as the original 312-528-5020
- The Works BBS - Most text philes in US..maybe even the WORLD 617-861-8976
- --------------
- Typed by Havok Halcyon...
-
- Converting a Tone Dialer into a Red Box
- =======================================
-
- by Noah Clayton
-
- A very simple modification to Radio Shack pocket tone dialer part #43-
- 141 ($24.95) can make it into a red box. The modification consists of
- changing the crystal frequency used to generate the microprocessor's
- timing. To make this modification you will need a Phillips screwdriver, a
- flat bladed screwdriver, a soldering iron, a pair of long nose pliers, a
- pair of wire cutters and a 6.5536 MHz (megahertz) crystal.
-
- Orient the dialer with the keypad down and the speaker at the top.
- Remove the battery compartment cover (and any batteries) to expose two
- screws. Remove these two screws and the two on the top of the dialer near
- the speaker. There are four plastic clips that are now holding the two
- halves of the dialer together. Push on the two bottom clips near th
- ebattery compartment and pull up to seperate the bottom part. Now slide a
- flat screwdriver into the seam on the left starting from the bottom and
- moving towards the top. (You may have to do this on th eright side as
- well.)
-
- When the two halves separate, slide the speaker half underneath the
- other half while being careful not to break th tewires connecting thte two.
- Locate the cylindrical metallic can (it's about half an inch long and an
- eighth of an inch in diameter) and pull it away from the circuit board to
- break the glue that holds it in place. Unsolder this can, which is a
- 3.579545 MHz crystal, from the circuit board.
-
- The hard part of this modification is getting the new crystal to fit
- properly. Bend the three disk capacitors over,[And out of the way the best
- you can, making room for the new crystal. You may need to remove the screw
- in the way as well.] Since the 6.5536 MHz crystal is probably much bigger
- than the crystal you are replacing, you will need to bend the leads on the
- new crystal so that they will match up will the pads on the circuit board.
- Place the new crystal on the circuit board by soldering it in place. As an
- added touch you might peel he QC sticker off of the PC board and place it
- on top of the crystal. Now carefully snap the two halves back together
- while checking to make sure that none of the wires are getting pinched or
- are in the way of the screw holes. Put the case screws back ion and insert
- three AAA batteries into the battery compartment.
-
- You dialer is now ready to test. Switch the unit on. The LED on the
- dial pad side should be lit. Set the lower slide switch to STORE mode.
- Press the MEMORY button on the dial pad. Press the * key five times.
- Press the MEMORY key again and then press the P1 key. A beep tone when any
- key is pressed and a long beep should sound after the P1 key has been
- pressed to indicate that the programming sequence was performed correctly.
-
- Switch th eunit into DIAL mode. press the P1 key, and five tone
- pulses that sound remarkably like coin tones should come out of the
- speaker. I usually program P1 to be four quarters (insert one or two
- PAUSE's between each set of five tones), P2 to be two quarters, and P3 as
- one quarter.
-
- Of course, you can no longer use the unit to generate touch tones.....
-
- REFERENCE
-
- The crystal is available from Fry's Electronics in Freemont, CA for
- $0.89 plus the charge for UPS Red or Blue. Their number is 415-770-3763.
- I would suggest buying five, some for future use and some just in case you
- cut the leads too short when trying this project.
-
-
-
- Downloaded From P-80 International Information Systems 304-744-2253
-