JPS5570196A - Remote transmitter/receiver - Google Patents

Abstract

PURPOSE:To secure the remote transmission and reception through connection of the capacity in selection by providing the gate terminal of the necessary oscillation frequency to the inverter circuit along with connection of the capacity and thus forming the feedback-type CR oscillation circuit to the inverter output terminal. CONSTITUTION:The delay circuit consisting of capacity C1 and resistance R plus inductance L are connected in the T-shape formation to the output and of inverter circuit 1, and capacity C2 is connected to the output via the change-over switch. One end of C2 is fed back to the inverter functioning as the switching element to from the CR oscillation circuit. In such constitution, the gate terminals are prepared in the number equivalent to the necessary oscillation frequency at the transmitter side, and C2 is switched to set the frequency. While the pulse counter is prepared at the reception side to form the DC voltage which is integrated in accordance with the signal frequency. The DC voltage is divided properly to be applied to the switching element for switching, thus obtaining the switching output in accordance with the signals. In such constitution, the effect of the higher harmonic can be eliminated completely, also simplifying the circuit constitution of the reception side.