Have you ever attempted to copy a commercially produced video only to end up with a distorted and jumpy image? If so, then you have run afoul of MacroVision. MacroVision is the most popular copy protection scheme used on the majority of content distributed on VHS cassettes. Like all copy protection, it does nothing to discourage the real pirates and only annoys the user who may wish to create a legal copy for backup and archival purposes. This circuit can eliminate MacroVision encoding in both NTSC and PAL recordings.
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R1, R2, R3, R4, R5, R7 6 68K 1/4W Resistor
R6 2 75 Ohm 1/4W Resistor
R8, R9 2 100 Ohm 1/4W Resistor
R10 1 2.2K 1/4W Resistor
R11 1 1.5K 1/4W Resistor
R12, R17 2 470K 1/4W Resistor
R13, R16 2 33K 1/4W Resistor
R14 1 6.8K 1/4W Resistor
R15 1 22K 1/4W Resistor
R18 1 47K 1/4W Resistor
C1 1 15uF Electrolytic Capacitor
C2 1 220uF Electrolytic Capacitor
C3 1 220pF Ceramic Disc Capacitor
C4 1 0.0022uF Ceramic Disc Capacitor
C5, C7, C8, C9, C10, C11, C12, C13 7 0.1uF Ceramic Disc Capacitor
C6 1 0.47uF Ceramic Disc Capacitor
D1-D9, D10-D18, D19-D27, D28, D29, D30, D31, D32, D33, D34, D35 35 1N4148 Diode
Q1 1 BC548 NPN Transistor
Q2 1 BC558 PNP Transistor
U1 1 4040 12-Bit Ripple Counter
U2, U3 2 4027 Dual J-K Flip Flop
U4 1 4011 Quad Two Input NAND Gate
U5 1 TL802 Dual Op Amp
U6 1 4053 Triple Two Channel Multiplexer
U7 1 4069 Hex Inverter
J1-J9, J10-J18, J19-J27 27 Jumper
J28, J29 2 RCA Jack
MISC 1 PC Board, Wire, Sockes For ICs
The circuit was submitted via email by Jari Ekstrom. Jari noted that the author is Antti Paarlahti and that the circuit originally came from the author's website. This website is no longer accessible. However, some searching revealed that the author of the circuit also wrote The MacroVision FAQ. The email address listed for the author in the FAQ is invalid and the FAQ was last updated in late 1996. This circuit reproduced here without...
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