| ==Phrack Inc.== | |
| Volume Three, Issue 28, File #5 of 12 | |
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| || || | |
| || A Real Functioning PEARL BOX Schematic || | |
| || || | |
| || Written, Tested, and Used || | |
| || || | |
| || by Dispater || | |
| || || | |
| || July 1, 1989 || | |
| || || | |
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| Introduction: After reading the earlier renditions of schematics | |
| for the Pearl Box, I decided that there was an | |
| easier and cheaper way of doing the same thing | |
| with an IC and parts you probably have just laying | |
| around the house. | |
| What Is A Pearl Box and Why Do I Want One? | |
| A Pearl Box is a tone generating device that is used to make | |
| a wide range of single tones. Therefore, it would be very | |
| easy to modify this basic design to make a Blue Box by | |
| making 2 Pearl Boxes and joining them together in some | |
| fashion. | |
| A Pearl Box can be used to create any tone you wish that | |
| other boxes may not. It also has a tone sweep option that | |
| can be used for numerous things like detecting different | |
| types of phone tapping devices. | |
| Parts List: | |
| CD4049 RCA integrated circuit | |
| .1 uF disk capacitor | |
| 1 uF 16V electrolitic capacitor | |
| 1K resistor | |
| 10M resistor | |
| 1meg pot | |
| 1N914 diode | |
| Some SPST momentary push-button switches | |
| 1 SPDT toggle switch | |
| 9 Volt battery & clip | |
| and miscellaneous stuff you should have laying around the house. | |
| State-of-the-Art-Text Schematic: | |
| + 16V 1uF - | |
| _______________________________||_____ | |
| | ! ! || | _ | |
| | _______________________ |__________| |/| 8ohms | |
| ____|__|_____:__|__:__|_ | __________| | | | |
| | 9 10 11 12 13 14 15 16 | | | |_|\| | |
| | CD4049UBE | | | | |
| |_1__2__3__4__5__6__7__8_| : | _ | |
| | | |__| |__| | |____________________|_________[-] | |
| | | ! ! : [b] | |
| | |__________________________| [a] | |
| | : : | [t] | |
| | ! 1N914 ! ! [t] | |
| |___________|/|_____________________________________[+] | |
| : |\| : : | |
| | | | | |
| | 10M | | | |
| |___/\/\/\__| | | |
| | | | | |
| |_____||____| | <-- These 2 wires to the center pole | |
| || | | of switch. | |
| .1uF 50V | | | |
| | | | |
| _______________________| |_____________________________ | |
| | ___[Toggle Switch]____________ | | |
| | | | ___ | | |
| | | | o o | | |
| | | | /\/\/\___| |__| | |
| |_/\/\/\____/\/\/\ | | ^ | | |
| 1K ^ | |____| ___ | | |
| |___| | o o | | |
| | /\/\/\___| |__| | |
| (pot side) (push-button | ^ | |
| side) |__| | |
| Explanation: | |
| The 2 wires that lead from the main part of the circuit | |
| should be connected to the center poles on the toggle | |
| switch. Put the 2 wires to the pot on one side and the 2 | |
| wires going to the push-buttons to the other side. That way | |
| you can switch between tone sweep and the favorite tones you | |
| like (the push-button side). | |
| To keep tones that you want to use frequently like 1850 Hz | |
| then all you have to do is put in a variable resistor and | |
| adjust it to where you have the correct tone, then just put | |
| a push-button switch on the line. You can link them | |
| together in a chain, etc. There are many other good | |
| modifications to make to the box so have fun and be smart. | |
| --Dispater | |
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