Article View: sci.electronics
Article #5435vcr recording
From: Zahid Ahsanullah
Date: Thu, 02 Aug 1990 20:43
Date: Thu, 02 Aug 1990 20:43
532 lines
29132 bytes
29132 bytes
Sorry my original post got cut short. Here's the schematic someone
sent me. It has not been tested so I can't say if it works. I don't
claim any responsibility for the contents of this article so use
at your own risk.
----------------------------
From: mark@cygnet.CYGNETSYSTEMS (Mark Quattrocchi)
Subject: Macrovision Eliminator
Date: 16 Jun 88 23:24:38 GMT
Well here it is. Since I've had so many request for this goody I thought
I'd just post it instead. This Macrovision Eliminator is about as good as I
can get it. It has a bandwidth well over 10mhz and should be able to drive
a number of devices in parallel. For those who plan to make one I must warn
you that I take no responsibilty for anything (my disclaimer :-)). I have
tried it on a number of different tapes, VCRs and TVs so it should work good
for everybody.
Have fun!!! Yeah, I can finally rent tapes again!
Notes: This also eliminates time codes and close caption 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 a + at an
intersection it isn't connected.
____________
| LM1201 |
Video 10uf 16| |12
In >-----+--+--||---+--------------------|In Vcc2|--------------+--<+12v
| | + | 1N914 3| |15 200 |
| | +--|<|--+------------|Vref Vcc1|------/\/\/---+
Video | | | .1uf | |10 75 |
In >------------>Gnd +--||--+ | Vcc3|------/\/\/---+
| | 75 | | |
| +--------------/\/\/---+ | |
| 10k | | |13 .1uf
+12v>--------+---/\/\/--------------+ | Cont.C.|------||------+
| | |Gain | 4| | |
| | +----------------------|Contrast | |
| | 10k | | |14 |
| +---/\/\/--------------+ | Cont.C.|--------------+
| | |Offset | 6| |
| | +----------------------|Clamp+ |
| | 5.1k 43k | | |
| +---/\/\/---+--/\/\/---+ | |
| 1000pf | | 5| |11 51
| +----||-----+----------------|C.G. Drive|------/\/\/---+
| | | 8| |2 .1uf |
+-----------------+----------------|Out Ccap|-------||-----+
| | | | 75 | | |7 |
| | | +--/\/\/---+ | Gnd2|--------------+
| | | | 200 | 9| |1 |
| | | +--/\/\/---------|Clamp- Gnd1|--------------+
| | | | |____________| |
| | | | A1 |
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 |
| +------------------------------+
| | ____________
| | | LF1333 |
| | 4| |5
| Gnd>---------------|Gnd V-|-----<-12V
| | 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
SOME NOTES: 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.
TIMING DIAGRAM AND ADJUSTMENT PROCEDURE:
Set up: Connect a scope up to the video input and trigger on vertical sync.
Make sure you can still see past the Macrovision pulses.
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 A1-pin8.
2. Adjust GAIN for 1 volt peak to peak output.
3. Adjust OFFSET for a 1-2 volt DC offset.
4. Connect the 2nd channel on the scope up to A3-pin13.
5. Adjust POSITION so the falling edge of the signal is in the middle
of the horiz. line just before the Macrovision pulses (see timing).
6. Connect the 2nd channel of the scope up to A3-pin5.
7. Adjust WIDTH so the falling edge of the signal is in the middle
of the horiz. 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 | |_____|_____|_____| | | | | | | |
8. Connect the 2nd channel of the scope up to A4-pin4.
9. Adjust EQ.START so the rising edge of the signal is just after the single
Macrovision Burst (see timing)
10. Connect the 2nd channel of the scope up to A4-pin12.
11. Adjust EQ.WIDTH so the signal is low during the equalization pulses and
goes high just after the color burst signal (see timing).
12. Connect the 2nd channel of the scope up to Video Out.
13. Adjust BLANKING level to match the rest of the videos blanking.
14. The video output should now look like Macrovision never existed.
15. Try it!
A Single Macrovision Burst
|<--------------------------------->|
_ _ _ _ _ _ _
| | | | | | | | | | | | | |
_________ _ | |_ | |_ | |_ | |_ | |_______ _ | |_ | |_
Video In |_| |_| |_| |_| |_| |_| |_| |_| |_| |
_______________________________________________________________
Q2 (A3-pin5)___|
__________ _ ___ ___ ___ ___ _________ _ ___ ___
Csync (A2-pin1) |_| |_| |_| |_| |_| |_| |_| |_| |_| |
__ __________ ____
Q1 (A4-pin4) |__________________________________| |________________
__ __________ ___________________________________ ____________
Q2 (A4-pin12) |___| |___|
If there is anything I forgot to mention or is unclear (I know, too late)
send me mail and I'll try to clear it up.
Mark Quattrocchi
From: mark@cygnet.CYGNETSYSTEMS (Mark Quattrocchi)
Subject: Macrovision Eliminator
Date: 11 Jul 88 00:05:21 GMT
I hope I didn't miss too many questions about my macrovsion eliminator
while our news feed was down. If so please repost or send me mail. I did
receive a couple of questions and thought I'd post instead of mail. Some
people are having problems getting the National Semi LM1201, and I thought
I'd explain. The LM1201 is new and will be in production shortly (well thats
what they tell me :-)). I got mine from the first sample run. Since some
of you are trying to build this goody I figured I'd send you another version
that does not use that part. Also 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 (hope it works Bill :-)) and left
his article in tact by only appending the rest of the macrovision circuit
to his DC restorer.
For those who plan to make one I must warn you that I take no responsibilty
for anything (my disclaimer :-)). I can't speak for Bill but you can ask
him yourself. I hope he doesn't mind me doing this!?!?
Notes: This also eliminates time codes and close caption 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 a + 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.
Just a note: The op amp used below must be a video op amp like the RCA CA3100.
C
| |
VIDEO IN O------+------| |------+----------------+---------------+
| | | | | |
| | |\ ___ |
| | | \ / \ (DIODE) |
+----/\/\/\-----+----|- \ | |
R | >----+ |
+----|+ / |
| | / |
| |/ |
___ |
/// |
|
+------------------------------------------------------------+
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 |
| +------------------------------+
| | ____________
| | | LF1333 |
| | 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 |
|__________|
SOME NOTES: 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.
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 horiz. 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) |___| |___|
If there is anything I forgot to mention or is unclear (I know, too late)
send me mail and I'll try to clear it up.
Mark Quattrocchi
Technical Details
Message-ID:
<1990Aug2.204325.9658@mozart.amd.com>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!uwm.edu!lll-winken!sun-barr!newstop!sun!amdcad!mozart.amd.com!zahidShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!uwm.edu!lll-winken!sun-barr!newstop!sun!amdcad!mozart.amd.com!zahid From: zahid@mozart.amd.com (Zahid Ahsanullah) Newsgroups: sci.electronics Subject: vcr recording Message-ID: <1990Aug2.204325.9658@mozart.amd.com> Date: 2 Aug 90 20:43:25 GMT Distribution: na Organization: Advanced Micro Devices, Inc. Lines: 532