R7731 Circuit Diagram
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R7779 - Burst Triple Mode PWM Controller with Integrated HV Start-up
R7731A - Burst Triple Mode PWM Flyback Controller | Richtek Technology
R7731_3181126.PDF Datasheet Download --- IC-ON-LINE
How RTL-SDR dongles work
Nigun (Melody): Open Hardware Plans for an RTL-SDR Downconverter
Basic SDR Upconvertor
R7723_15 Datasheet(PDF) - Hamamatsu Corporation
R7731 - Burst Triple Mode PWM Flyback Controller | Richtek Technology
RTL_SDR Resources - EasyEDA