PURPOSE: To obtain a stable output current by connecting two input terminals to both inputs of a differential amplifier.
CONSTITUTION: Resistors 2∼4 are connected in series from a reference voltage VREF in an input circuit section 1 and a cord 3 for remote control is connected across the resistor 3. Resistors 6, 7 are connected to the two input terminals of the differential amplifier 8 and the output of the differential amplifier 8 is connected to the input/output terminal of a current mirror circuit 9 and an output V0 is provided on the output side of the current mirror circuit 9 to obtain an output current I0. When the cord 5 is approached, the input minute change is equal and in phase and the difference is always equal. Thus, the output current is always constant and changes in response to the change in the resistor 3 and a constant output current is obtained without being affected by an external static effect.
| JP3635641 | PRE-AMPLIFIER |
| JPS5931911 | [Title of the Invention] Television receiving set |
TANAKA YUJI
IMAI HIDETOSHI
