| 摘要 |
The circuit includes a synchronous detector (5) for driving transistor (Q1) by output signal of an integrator (1), a switching unit (10) for selecting and transmitting image signal, letter signal, and audio signal from input terminals (S2,S3,S4) through buffers (A1-A3), and a modulator (RF) for modulating signals from the switching unit (10) and a transistor (Q5) to RF signal.
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