Abstract
AbstractThe photocoupler has been widely used as an interface element for circuit coupling functions. A light‐emitting diode is used on one side and the second side consists of an FET‐optocoupler. This combination of elements can be used as an optronit controllable device which exhibits optically controlled negative resistance characteristics.A negative resistance circuit consisting of a combination of two photocouplers is discussed and a reversible switch in this circuit capable of flip‐flop switching is experimentally demonstrated. A negative resistance circuit with bilateral characteristics that are independent of the polarity of the applied voltage is also proposed. This circuit can control the polarity selection of the negative resistance characteristics, depending on the external light. Phase control of the starting AC voltage, as well as oscillation control of a bilateral relaxation oscillator circuit are discussed on the basis of the experimental results.
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