• on Audio/Video/Photography
  • Published in issue 9/2001 on page 0
About the article

Video to S-VHS Converter

From composite (CVBS) to C/Y

Video to S-VHS Converter
Having problems connecting standard video to your S-VHS equipment? You need this neat circuit. It takes a composite video signal and converts it into the C/Y input signals used by S-VHS. To simplify construction a PCB design is supplied.A standard video signal (also known as Composite Video Baseband Signal or CVBS) contains the black/white and picture synchronisation information together with the colour information in one signal. S-video signals (also known as Y/C) are slightly different in that these two parts of the picture signal are supplied as separate signals. Y is the luminance signal containing both black/white and sync information while C is the chrominance signal containing colour information.Equipment using Y/C signals has the advantage of better picture resolution (greater bandwidth), less cross-colour interference and fewer filters for the signals to squeeze through.
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Products
Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Resistors:
R1,R2 = 2kOhm 2
R3,R4,R6 = 120Ohm
R5,R7 = 47kOhm
Capacitors:
C1 = 33pF
C2 = 100µ F 10V radial
C3,C4,C6,C8 = 100nF ceramic
C5 = 4µ F7 35V tantalum bead
C7 = 470µ F 10V radial
C9 = 25pF trimmer capacitor (3-25 p)
Inductors:
L1,L2 = 47µ H
Semiconductors:
T1,T2 = BC550B
Miscellaneous:
K1 = Cinch socket, PCB mount, e.g., T-709G (Monacor/Monarch)
K2 = 6-way Mini-DIN socket, PCB mount, angled pins
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