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Text File  |  1999-01-28  |  2KB  |  51 lines
  1.  
  2. 2600 Hertz Single Tone Generator  Schematic
  3. -------------------------------------------
  4.  
  5.  
  6. Parts:  555 timer I.C.
  7.         8 ohm speaker                          |
  8.         9 volt battery & connector           --+--  =  connection
  9.         Pushbutton switch                      |
  10.         5k potentiometer
  11.         1k ohm resistor                        |
  12.         4.7 micro-farad capacitor            -----  =  no connection
  13.         3.3 micro-farad capacitor              |
  14.  
  15.  
  16.                    +----+-------------------------------+
  17.                    |    |                               |
  18.                    |    V      1k                       |
  19.                    |  /\/\/-+-/\/\/-+---------------+   |
  20.           +--------+   5k   |       |               |   |
  21.           |     ---|--------|-------|--------|---   |   |
  22. pshbtn  | o     |  8        7       6        5  |   |   |
  23. switch -+       |                               |   |   |
  24.         | o     |||           5 5 5             |   |   |
  25.           |     |||           TIMER             |   |   |
  26.           |     |                               |   |   |
  27.   (+)-----+     |  1        2       3        4  |   |   |
  28. 9 volts         ---|--------|-------|--------|---   |   |
  29.   (-)--------------+        |       |        |      |   |
  30.                    |        +-----------------------+   |
  31.                    |  3.3uF         |        |          |
  32.                    +--->|--------------------+----------+
  33.                    |                |
  34.            4.7uF  \_/               |
  35.                   ---               |
  36.                    |(+)             |
  37.                    |     ______     |
  38.                    +----| 8ohm |----+
  39.                        /__SPKR__\
  40.  
  41.  
  42. To calibrate:
  43.  
  44. Play next to a pure 2600hz source and adjust the 5k potentiometer until the two
  45. sounds are the same. As you get closer you will hear a beat tone form and get
  46. slower and slower. When it stops, the two frequencies are equal. This takes a
  47. little practice.
  48.  
  49.  
  50.  
  51.