RGB MUX (Multiplexer) Circuit Calculator

You can use the RGB mux calculator without logging in, but the values shown are default values only and not specific to any CRT model.Login to access accurate pre-calculated values from our database for specific CRT models.

Circuit Diagram

CRT Model

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OSD Chip Model Number

OSD

Jungle Chip Model Number

Jungle

Configuration

Direct Injection? Disabled

Chassis RGB Diodes? Not Added

Chassis Blanking Diode? Not Added

MUX Blanking Diode (D9/R9)? 1N4148

Chassis RGB values

Inline Resistors (Ω)R201, R202, R203

Ground Resistors (Ω)R204, R205, R206

RGB/OSD Voltage Division Calculation

Input Voltage: 5V

Inline Resistor (R1): 5600Ω

Ground Resistor (R2): 820Ω

Output Voltage: 0.64V

Formula: Vout = Vin × (R2 / (R1 + R2))

Chassis blanking values

Blanking Resistor (Ω)R208 on chassis

Blanking Ground (Ω)R207 on chassis

MUX RGB values

Calculation Mode

Calculate RGB Input Resistance

Calculate Output Voltage

Analog Vpp (Chroma Peak-to-Peak)Calculated output voltage based on resistor values

Termination (Ω)R1, R2, R3 on mux board. Typically termination is 75Ω.

RGB Input (Ω)Select common resistor value for R4, R5, R6

Output Voltage Calculation

V_chroma.peak: 0.81V

R_{osd.inline.resistor}: 5600Ω

R_termination: 75Ω

R_rgb.input: 1000Ω

V_osd: 5.0V

Chassis RGB Diodes: 0V (Disabled)

Chassis Blanking Diode: 0V (Disabled)

MUX Blanking Diode (R9): 0.7V (Enabled)

Calculated Output Voltage: 0.81V

Formula: V_out = (V_osd - V_diode) × (R_rgb + R_term) / (R_rgb + R_inline + R_term)

MUX blanking values

Blanking Ground (Ω)

R10 on mux board.

Blanking Inline (Ω)

R11 on mux board.

Chassis blanking voltage calculation

Input Voltage: 5V

Blanking Resistor (R11): 1000Ω

Blanking Ground Resistor (R207): Ω

MUX Blanking Diode (D9) Drop: 0.7V

Output Voltage: -0.70V

Formula: Vout = (Vin × (R207 / (R11 + R207))) - 0.7V

MUX audio values

Audio Resistors (Ω)

R7, R8 on mux board.