| 摘要 |
PURPOSE:To omit a specific separately excited power supply by forming an AC waveform flowing into a closed circuit and generating a carrier pulse by using a part of said AC waveform. CONSTITUTION:A receiver X is connected with signal machines Y1, Y2 in series to form a closed circuit. A transformer T1 or the like is connected to the receiver X as a power supply part and primary current is made to flow always into the closed circuit. Since the pushbuttons BS of the signal machines Y1, Y2 are closed usually, a sine wave flows into the closed circuits R, S. If the pushbutton BS of an optional signal machine is depressed, current is made to flow into a signal circuit Z, but at the beginning, the current flows into a capacitor C2 through a capacitor C1 and a rectifier part S1 because a triode AC switch SR1 is disconnected. Subsequently, the voltage of the C2 is increased, and a transistor UJT is oscillated by the time constants of the R2 and C3 and the oscillated pulse transmits the oscillation state K to the closed circuit through P and T. When the diode TD is connected, the SR1 is turned on and transmits the voltage to a part between S' and R'. The receiver X discriminates the carrier of the state K to control loads L1-L3. |
