MACROVISION FAQ

Contents:

HISTORIC, not applicable to non-VCR media!


HISTORIC, not applicable to non-VCR media!

Chapter 6) NEW!! BUILD YOUR OWN -> SCHEMATICS


  6.1) About the Author

Macrovision Eliminator

Author: Mark Quattrocchi
E-Mail: Unknown!

The e-mail used to be mark@cygnet.CYGNETSYSTEMS but it INVALID and I do NOT know the new one... so don't bother asking :-)


  6.2) Introduction

I modified the schematic so you can use a single supply voltage (though you smart folks would have figured that out anyway). A voltage between 16-35vdc will run this, however if you use a supply over 24vdc you will probably need to add a heat sink for the voltage regulators. I'd like to thank Bill McFadden for the DC restorer circuit which I show as the LM1201 replacement and left his article in tact by only appending the rest of the macrovision circuit to his DC restorer.


  6.3) Disclaimer

For those who plan to make one I must warn you that I take no responsibility for anything.


  6.4) Schematic


                           C
                          | |  
 VIDEO IN   O------+------| |------+----------------+---------------+
                   |      | |      |                |               |
                   |               |    |\         ___              |
                   |               |    |  \       / \ (DIODE)      |
                   +----/\/\/\-----+----|-   \      |               |
                           R            |      >----+               |
                                   +----|+   /                      |
                                   |    |  /                        |
                                   |    |/      [See Note 3]        |
                                  ___                               |
                                  ///                               |
                                                                    |
       +------------------------------------------------------------+
Video  |
 In >-----+
       |  |
Video  |  |
 In >------------>Gnd
       |  | 
       |  |  
       |  |  
       |  |                    ____________       
       |  |                   |   LM1881   |      
       |  |                  8|            |1     
       |  |           +12v>---|Vcc    Csync|----------+
       |  |          .1uf    2|            |5         |
       |  +-----------||------|In     Burst|--        |
       |        680          6|            |3         |
       |    +--/\/\/-+--------|Rset   Vsync|------+   |
       |    |  .1uf  |       4|            |7     |   |
       |    +---||---+    +---|Gnd    Field|-     |   |
       |    |             |   |____________|      |   |
       |    |             |         A2            |   |
       |    |             |   450         750     |   |
Gnd>--------+-------------+--/\/\/---+---/\/\/----+   |
       |                             |                |
       |               +-------------+                |
       |               |                              |
       |    +-----------------------------------------+
       |    |          |
       |    |          |       ____________ 
       |    |          |      |  74LS221   |
       |    |          |     1|   (1/2)    |16
       |    |          +------|A1       Vcc|----<+5v
       |    |                2|            |13
       |    |      +5v>---+---|B1        Q1|------+
       |    |             |  3|            |      |
       |    |             +---|Rst1        |      |
       |    |          .1uf 14|          __|4     |
       |    |Position+--||----|C1        Q1|-     |
       |    |  10k   |      15|            |      |
+5v>----------/\/\/--+--------|R/C1        |      |
       |    |   |    |        |____________|      |
       |    |   +----+              A3            |
       |    |          +--------------------------+
       |    |          |
       |    |          |       ____________ 
       |    |          |      |  74LS221   |
       |    |          |     9|   (1/2)    |8
       |    |          +------|A2       Gnd|---<Gnd
       |    |               10|            |5 
       |    |      +5v>---+---|B2        Q2|------------+
       |    |             | 11|            |            |
       |    |             +---|Rst2        |            |
       |    |           .1uf 6|          __|12          |
       |    |  Width  +--||---|C2        Q2|-           |
       |    |   10k   |      7|            |            |
+5v>-----------/\/\/--+-------|R/C2        |            |
       |    |    |    |       |____________|            |
       |    |    +----+             A3                  |
       |    |   750            450                      |
       |    +--/\/\/-----+----/\/\/---<Gnd              |
       |                 |                              |
       |             +----------------------------------+
       |             |   |                              |
       |             |   |     ____________             |
       |             |   |    |  74LS221   |            |
       |             |   |   1|   (1/2)    |16          |
       |             |   +----|A1       Vcc|----<+5v    |
       |             |       2|            |13          |
+5v>-------+------------------|B1        Q1|-           |
       |   |         |       3|            |            |
       |   |         +--------|Rst1        |            |
       |   |          .01uf 14|          __|4           |
       |   |EQ.Start +--||----|C1        Q1|------+     |
       |   |   20k   |      15|            |      |     |
       |   +--/\/\/--+--------|R/C1        |      |     |
       |        |    |        |____________|      |     |
       |        +----+              A4            |     |
       |               +--------------------------+     |
       |               |                                |
       |               |       ____________             |
       |               |      |  74LS221   |            |
       |               |     9|   (1/2)    |8           |
       |               +------|A2       Gnd|---<Gnd     |
       |                    10|            |5           |
       |           +5v>---+---|B2        Q2|-           |
       |                  | 11|            |            |
       |                  +---|Rst2        |            |
       |              1000pf 6|          __|12          |
       |     EQ.Width +--||---|C2        Q2|------+     |
       |        20k   |      7|            |      |     |
       | +5v>--/\/\/--+-------|R/C2        |      |     |
       |         |    |       |____________|      |     |
       |         +----+             A4            |     |
       |                                          |     |
       |           +------------------------------------+
       |           |                              |
       |           |    +-------------------------+
       |           |    |
       |           |    |      ____________
       |           |    |     |   74LS00   |
       |           |    |    1|            |14
       |           |    +-----|In1      Vcc|-----<+5v
       |           |         2|            |3
       |           +----------|In2     Out1|------+
       |                     7|            |      |
       |           Gnd>-------|Gnd         |      |
       |                      |____________|      |
       |                            A5            |
       |           +------------------------------+
       |           |           ____________
       |           |          |   LF13333  |	[See Note 2]
       |           |         4|            |5
       |   Gnd>---------------|Gnd       V-|-----<Gnd
       |           |        16|            |12
       |           +----------|In1       V+|-----<+12v
       |           |        14|            |15     10uf    75
       |      +---------------|S1        D1|-----+--||---/\/\/----->Video Out
       |      |    |         1|            |     | +
       |      |    +----------|In2         |     |    Gnd<--------->Video Out
       |      |              3|            |2    |
       +----------------------|S2        D2|-----+
              |               |____________|
              |                     A6     
              |    
   +12v>----/\/\/--<Gnd
             5k 
          Blanking
                                __________
                               |   7805   |
                               |   +12v   |
16-35VDC>---------+------------|In     Out|-----+-------+------>+12v
                  |            |          |     |+      |
     GND>----------------+-----|Gnd       |    ===     ===
                  |      |     |__________|     |10uf   |.01uf
                  |      |                      |       |
                  |      +----------------------+-------+------>Gnd
                  |      |      __________      |10uf   |.01uf
                  |      |     |   7805   |    ===     ===
                  |      |     |   +5v    |     |+      |
                  +------------|In     Out|-----+-------+------>+5v
                         |     |          |
                         +-----|Gnd       |
                               |__________|

NOTES:

  1. You can replace some of the pots with fixed resistors if you like. The OFFSET pot can be replaced with a 7.85k to +12v and a 1.43k resistor to ground. The POSITION pot can be replaced with a 6.25k resistor. The WIDTH pot can be replaced with a 6.81k resistor. The BLANKING pot can be replaced with a 4.18k resistor to +12v and a 592ohm resistor to ground. I do not recommend replacing any of the other pots with fixed values. If you do use fixed resistors please skip those steps in the adjustment procedure.
  2. [From the Editor] The chip name was originally listed in the schematic as LF1333 which is NOT correct. The correct chip name is LF13333 (4 3's). It's made by National Semiconductor and it's a QUAD SPST JFet Analog Switch: 2NC and 2 NO contacts. [source: NS Linear Databook from 1982 (!!)] The pins, according to that Databook are: 4=Vr, 16=IN4, 14=S4, 1=IN1, 3=S1 5=-Vee, 12=+Vcc, 15=D4, 2=D1 And here's what an engineer at National Semiconductor (http://www.national.com) sent me:
    "The LF13333 is still available. In Europe you may call National Semiconductor's Customer Response Center at 49 0180 532 7832 (English) or
    49 0180 530 8585 (German & Dutch). They should be able to tell you where to find any National Semiconductor product in Europe. In the USA the Customer Response Center can be contacted at 1-800-272-9959"

  3. This design also eliminates time codes and close caption (CC) information. Sorry about the cryptic schematic but what can you do when all you have is ASCII to work with. If you don't see an "+" at an intersection it isn't connected. All voltages used on A1-A6 are supplied by the two voltage regulators shown at the bottom of this schematic. The op amp, used below, MUST be a video op amp like the RCA CA3100.


  6.5) Timing diagram and adjustment procedure

Set up: Connect a scope up to the video input and trigger on vertical sync. The second channel will be used for looking at the device being adjusted. Pre-adjust all pots for center position.

  1. Connect the 2nd channel on the scope up to A3-pin13.
  2. Adjust POSITION so the falling edge of the signal is in the middle of the horiz. line just before the Macrovision pulses (see timing).
  3. Connect the 2nd channel of the scope up to A3-pin5.
  4. Adjust WIDTH so the falling edge of the signal is in the middle of the horizontal line just after the Macrovision pulses (see timing).
    
                                                          Macrovision
                                                    |<------------------->|
                                                    ||||| ||||| ||||| ||||| 
              _______                   ____________|||||_|||||_|||||_|||||________
    Video In   |     |_____|_____|_____|     |     |||||||||||||||||||||||||     |
              _______                   ___________________________________________
    Vsync (A2-pin3)  |_________________|
                      __________________________ 
    Q1 (A3-pin13) ___|                          |__________________________________
                                                 ______________________________ 
    Q2 (A3-pin5)  ______________________________|                              |___
    __            _________________________________________________________________
    Q1 (A4-pin12)                                  |     |     |     |     |
                  ______________________________                                ___
    Out (A5-pin3)                               |__|_____|_____|_____|_____|___|
     
             ________                   ___________________________________________
    Video Out |      |_____|_____|_____|     |     |     |     |     |     |     |
    
  5. Connect the 2nd channel of the scope up to A4-pin4.
  6. Adjust EQ.START so the rising edge of the signal is just after the single Macrovision Burst (see timing)
  7. Connect the 2nd channel of the scope up to A4-pin12.
  8. Adjust EQ.WIDTH so the signal is low during the equalization pulses and goes high just after the color burst signal (see timing).
  9. Connect the 2nd channel of the scope up to Video Out.
  10. Adjust BLANKING level to match the rest of the videos blanking.
  11. The video output should now look like Macrovision never existed.
  12. Try it!


                               A Single Macrovision Burst
                          |<--------------------------------->|
                             _     _     _     _     _               _     _
                            | |   | |   | |   | |   | |             | |   | | 
             _________   _  | |_  | |_  | |_  | |_  | |_______   _  | |_  | |_
Video In              |_| |_|   |_|   |_|   |_|   |_|         |_| |_|   |_|   |
                _______________________________________________________________
Q2 (A3-pin5)___|
            __________   _   ___   ___   ___   ___   _________   _   ___   ___ 
Csync (A2-pin1)       |_| |_|   |_|   |_|   |_|   |_|         |_| |_|   |_|   |
__          __________                                    ____
Q1 (A4-pin4)          |__________________________________|    |________________
__          __________     ___________________________________     ____________
Q2 (A4-pin12)         |___|                                   |___|


  6.6) Suggested References

From: Michael Schuster


Please check attribution section for Author of this document! This article was written by filipg@repairfaq.org [mailto]. The most recent version is available on the WWW server http://www.repairfaq.org/filipg/ [Copyright] [Disclaimer]