40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
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---------
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:Red Box:
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Brought to you by Sirius Cybernetics
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The Red box basically simulates the sounds of coins being dropped into
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the coin slot of a payphone. A payphone generates a burst of two mixed
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frequencies, 1700hz and 2200hz, for a specific time period to sound like
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a nickle dime or quarter. A nickle is 1700 HZ +2200 HZ for 66 milliseconds.
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A dime is 1700 HZ + 2200 HZ for 66 milli. secs. on, 66 MS. off , then 66
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ms on again. Finally, A quarter is 1700 HZ+2200 HZ for 33,ms on, 33 MS, off,
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continuosly repeating 5 times.
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When using a Red box on a Pay phone, first deposit a real nickle
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(because they can tell if the first one is a real one, then use the tone
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burst. You can build the circuit to generate a nickle tone, then record it
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and play it into the pay phone with a tape player to get the map, send 2
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dollars to:
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MASTER WORLD
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1609 S. BENTLEY AVE
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LOS ANGELES, CALIFORNIA 90025
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The map has many figures that the computer cannot produce.
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If you have the map, here are some tips Adjust R1 to get 2200 HZ at point A
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Adjust R2 " " 1700 HZ " ". Press switch for 66 MS on at speaker
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this simulates a nickle.
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The 555 timer-> 66MS timer The 556 dual timer->2200HZ+1700HZ generator
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741->timer OP AMP buffer for speaker.
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