Answer monitor circuit
专利汇可以提供Answer monitor circuit专利检索，专利查询，专利分析的服务。并且PURPOSE:To realize a small-size and economical answer monitor circuit, by using a half-constant current circuit that makes the DC resistance value variable through formation into a transistor plus a diode bridge and at the same time securing a holding rering receiving function. CONSTITUTION:A bridge circuit consisting of the diodes D4-D7 plus photocouplers PT2 and 3 is provided between the terminals A and B. At the same time, a half- constant current circuit is formed with a transistor TR, resistances R0-R2 plus capacitor CO to show a high and low impedance to the AC and DC respectively. Furthermore the photocoupler PT10 is connected between the resistance R2 and the base of the transistor TR, and at the same time a serial circuit comprising the photocoupler PT1 and the resistance R3 is connected in parallel to the resistance R1. The resistance between the terminals A and B is set e.g. at 400OMEGA in the answer monitor working mode by controlling the ratio among the resistances R0-R2. The resistance between A and B is set e.g. at 6.5KOMEGA while receiving the holding rering by controlling the value of the resistance R3.，下面是Answer monitor circuit专利的具体信息内容。
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