| 摘要 |
PURPOSE:To obtain an inexpensive set value switching circuit of simple circuit constitution which operates precisely and stably by including an oscillation means which outputs a pulse signal, a counting means, a signal converting means, a selecting means, and a filter means. CONSTITUTION:Output signals of comparators 34, 36, and 38 shown in figures C-E are inputted to a multiplexer 46. Selection signals SA-SC, on the other hand, are inputted to the multiplexer 46 and a necessary signal is selected among the output signals of the comparators 34, 36, and 38 and outputted to a low-pass filter 48. For example, when the selection signals SA-SC go up to a level 'H' and the output signals of the comparators 34, 36, and 38 are selected, outputs of the low-pass filters 48 are as shown in figures F-H. Therefore, levels of the output signals of the low-pass filter 48 are proportional to numerals set by digital numeral setters 40, 42, and 44. |
