An optocoupler PCB designed for S-Video mods for Sony CRT TVs utilizing the P-3 chassis (CX20193 or CXA1013 jungle chip). Because these TVs have a hot chassis, an optocoupler should be used to isolate the Chroma input from the hot ground.

Bill-of-Materials:

• C1 and C4: 0.01-1uF 50V Ceramic or Electrolytic Capacitors
• C2: 0.022uF 50V Ceramic Capacitor
• C3: 10uF 25V+ Electrolytic Capacitor
• D1: BZX79C5V6 5.6V 500mW Zener Diode
• Q1, Q2, and Q3: BC550 NPN Transistors (EBC Pinout)
• J1, J2, and J4: 2-pin 2.50mm Pitch JST Connectors
• J3: 3-pin 2.50mm Pitch JST Connector
• J5: 4-pin 2.50mm Pitch JST Connector
• R1: 15K ohm Resistor
• R2: 100 ohm (for CXA1013) or 470 ohm (for CX20193) Resistor
• R3: 3.8K ohm Resistor
• R4: 75 ohm Resistor
• R5: 3.3-6.8 ohm Flameproof Resistor (Value may vary by TV.)
• R6 and R8: 100 ohm Resistors
• R7: 4.7K ohm Resistor
• R9: 10K ohm Resistor
• R10 and R11: 1K ohm Resistors
• U1: 6N136 or SFH6136 Optocoupler IC