| 摘要 |
PURPOSE:To stably fire and display a display element irrespective of the variation in a load and the type of the element by inserting and connecting the element in series with the power source input terminal side of a switching control circuit. CONSTITUTION:A light emitting diode LED is inserted and connected in series between the emitter of a transistor Tr1 of a voltage controller 1 and the collector of a transistor Tr2 at the input side of a power source 8 of a switching controller 2. The diode LED is isolated from the input/output side of the transistor Tr1, and inserted in series between the power source terminals of both controllers 1, 2 without connection in parallel. Accordingly, it is unaffected directly by the switching operation of the transistor Tr1. |
