Drive repair op amp and comparator compares the difference between the operational amplifier and a dedicated inverter is relatively common in the MPU control circuit, its role is not to describe a drive principle, I do better than I know this line. An op amp can be connected to become a comparison output of the comparator is a comparison. So why the market two products are sold separately, they have the same and the difference between what is it? 2, the comparator output is generally easy OC level converter; frequency comparator does not fill, SLEW RATE than comparable op zoom, but easy access into the amplifier self-excitation. Comparator open loop amplifier gain is much higher than the average, so the positive and negative terminals of the comparator caused by small differences on the output change. 3, the frequency response on the one hand, to a further operational amplifier when the comparator output is unstable, the subsequent stage may not be able to meet the requirements of a logic circuit. 4, the comparator output is open collector inverter on the people, easily output TTL level, but there is saturation voltage op amp, inconvenient to use. Shenyang, China Electric Co., Ltd. to undertake the industrial automation and control system design, installation, engineering and maintenance; professional maintenance States converter, DC governor, PLC programmer repair operations. Drive repair entry - good or bad light emitting diode emitting diode test test good or bad, positive and negative resistance can be tested in accordance with test method ordinary silicon diodes. Refers to the bell multimeter dial in R * 100 or R * 1K file, then the light-emitting diode cathode with a black pen, red pen then negative converter, the measured forward resistance should be 20 = 40K; pick-emitting diode anode with a black pen, red pen then positive, measured reverse resistance should be greater than 500K or more. Diode-speed dial with a digital multimeter, black pen then the positive light-emitting diodes, the red pen then negative, resistance is infinite. Black pen then the negative vector converter light-emitting diode, the red pen then positive, there will be micro-light emitting diodes indicate normal. Inverter manufacturers _ _ Shenyang drive on the Limited provided by the Shenyang Electric Man. Shenyang Electric Co. on people (www.zsmsy.com) strong, credible, in other industries, such as Shenyang, Liaoning province has accumulated a large number of loyal customers. The company better work attitude and constantly improving people and innovative ideas will lead you to walk hand in hand on the Shenyang brilliant, for a better future!