| 摘要 |
PURPOSE:To omit a processor and to realize a compact size of a device by providing a peak LED drive circuit to convert the analog voltage signal to indicate a dimmer pattern into a digital voltage data, a memory circuit, an address designation switch, and a ladder resistor circuit. CONSTITUTION:The input of a data setting circuit 30 is converted into a digital signal of 8 bits by a peak LED drive circuit 40. An 'or' circuit 50 delivers it to a RAM 10 and a ladder resistor circuit 60 through the built-in inverter. In the resistor circuit 60, it is converted into an analog signal through resistor and diodes, and a lamp 90 is lighted through an amplifier 30 and a dimmer 80. In the RAM 10, first an address is selected by a switch circuit 20, then switches 101 and 102 are closed, and a voltage data is stored in a designated address. By operating the dimmer depending on the switching operation, a corresponding digital voltage signal is read from the RAM, and it is converted to a corresponding analog value in the ladder resistor circuit. As a result, the lamp is lighted according to the analog voltage value. Consequently, a processor and the like can be omitted, and the circuit can be simplified. |
