1, when you correctly connect the power supply, such as the positive electrode and the earth, the negative electrode will naturally become a negative voltage output. This design opens up possibilities for sensor chips and op-amps that require positive and negative power supplies.
2, should goRemove a voltage regulator (D1 or D2 can be), and remove a resistor, if the regulator remove D1 resistance to remove R1, if the regulator remove D2 resistance to remove R2, and reduce the resistance value of the other resistor to tens of euros to hundreds of euros (according to the working current of the MCU and op amp).
3, should be made in the transformer secondary a 9 volt coil separately connected to a rectifier bridge, a L7805 three-end regulator output 5 volts of power supply, and then make a double 15 volt coil connected to the rectifier bridge capacitor filter output positive or negative 15 volts of power supply to the op amp. Ground wires have to be connected together.
The input and output need to be properly connected, and the output signal needs to be connected to the input for processing. The pin of the chip needs to correspond to the symbol on the circuit diagram to ensure the correct connection. The chip connection should follow the direction of the signal stream, i.e. from the input end to the output end.
Power connection: The chip needs to be connected to positive and negative powerThe source is usually VCC and GND. If the power connection is not correct, the chip will not work properly. Input/output connection: The input and output ends of the chip need to be connected to other devices. The connection mode can be determined by checking the chip manual.
The connection of the digital logic circuit diagram chip needs to be connected according to the design of its internal logic circuit. In general, the pin number of the chip will be marked, and the connection can be made according to the mark.
Determine the number and arrangement of the chip's pins: First you need to understand the number and arrangement of the chip's pins used, so that you can connect them correctlyThe chip. Determine the chip function and input and output ports: Before connecting the chip, it is necessary to clarify the function of the chip and the role of each pin, as well as the position of the input and output ports.
The chip connection mode in the digital electrical logic circuit diagram needs to follow certain rules, mainly including the following steps: Select the appropriate chip according to the number of pins and functions of the chip in the circuit diagram. Understand the pin arrangement and function of the chip, and connect different pins of the chip as needed.
It depends on the power supply on the circuit board there is no design anti-power reverse diode, if there is no (power reverse) is 0.1 seconds will burn the chip.
The following situations will occur when the positive and negative terminals of the power supply are reversed: The positive and negative terminals of the power supply will burn electrical and electronic components with power supply polarity requirements, such as transistors, integrated blocks, electrolytic capacitors, etc. Because the polarity of the power supply is opposite, the electrical appliances can not work, or work abnormally, such as quartz watches, electric toys, DC motors, etc.
Motor class should not, transistor, setBlock electrical appliances will definitely be burned out (but some transistor electrical appliances are connected to a diode in series at the input end to prevent damage caused by the negative electrode, which will not burn out).
The positive and negative poles will burn the circuit board, and the motherboard has no anti-reverse connection protection, causing the components inside to directly pass the reverse electricity, causing the components to burn. The role of the diode in the circuit is to ensure that the direction of the current is certain, and some components on the motherboard do not allow large current through.