| 摘要 |
PURPOSE:To omit a resistance for bias voltage and to attain the reduction of cost with a voltage level converting circuit, by applying an intermediate level of the binary voltage supplied to the cathode side of a diode to an anode via a resistance and obtaining an output from the anode. CONSTITUTION:The cathode voltage of a diode 7 is set at a low or high level by turning on and off a switch 2. Here an intermediate voltage level +5V, for example, between low and high levels is applied to the anode of the diode 7 via a resistor 8. Thus a diode current flows to set the anode voltage at about 0V when a cathode is set at 0V. No diode current flows when the voltage +24V is applied to the cathodes. Then the anode voltage is set at +5V. Here the low/high levels of 0/24V are converted into the standard input voltage of a TTL logical circuit of 0/+5V, and applied to the TTL logical circuit connected to the anode. Then the high level of the converted output is changed by changing the level of the DC voltage applied to the anode of the diode. Therefore a diode can substitute a transistor and a resistance is omitted. |
