With the continuous maturity of radio technology, various remote control devices have been widely used in people's lives, so that we have realized a lot of convenience. Here we introduce the production of a 4-way remote control switch.
1, the working principle of the circuit
The circuit schematic is shown in Figure 1. The circuit is mainly composed of a power supply part, a wireless receiving part, a data decoding part and a switch control part. The DC 12V power input receiver supplies power to the relay all the way, and the other channel is regulated by the three-terminal voltage regulator device, and outputs 5V working voltage as the power supply for the wireless receiving part and the decoding part.
Normally, the 10 to 13 pins of IC3 output low level, and the 4 relays controlled are disconnected. When the receiving module SH9902 receives the radio coded signal transmitted by the remote controller, it will output a series of control data codes at its output. After the coded information is decoded by the dedicated decoding integrated circuit IC3, the corresponding control data is output at the data output end. Since the four-way remote control switch is introduced in this paper, the working condition of each way is exactly the same. Therefore, here we take one of them. Take an example for explanation. Take the relay connected to D0 as an example. When the data signal is transmitted: 0001, the output data of 2272 is also 0001. In other words, the output of the 10, 11, and 12 pins of IC3 is low, and the output of the 13 pin is high. The level provides the base current to VT1 via R2, the VT1 is saturated, and the relay K1 is electrically connected. The electrical equipment controlled by it operates, so that the remote control of the electrical equipment is completed by the operation of the remote controller on the hand. If the selected decoder chip is M type, when the remote control signal disappears, all the data bits are all output low, and the controlled four-way relays are all disconnected.
Since the production and debugging of high-frequency circuits requires certain skills, and at the same time, with professional instruments, in order to improve the success rate of students, the high-frequency part of the remote control switch kit of this kit uses a relatively mature finished product, that is, no Need to be produced by the producer. In the actual production, some readers have proposed a circuit schematic for the high-frequency part in order to analyze the circuit principle. Below we give the circuit diagram of the remote control and the super-regeneration receiving circuit for the reader's reference:
Oil level winding thermometer,Also known as winding temperature controller, winding temperature indicating controller,
Product introduction of temperature controller:
It is mainly composed of elastic element, sensing tube, temperature sensing component, electric heating element, integrated converter and digital display instrument. The temperature packet of the transformer winding thermometer is inserted into the oil hole on the top of the transformer oil tank. When the transformer load is zero, the reading of the winding thermometer is the temperature of the transformer oil; When the transformer is loaded, the current directly proportional to the load taken out through the transformer current transformer flows through the electric heating element embedded in the corrugated pipe after being adjusted by the converter, The displacement of the elastic element increases. Therefore, after the transformer is loaded, the displacement of the elastic element is determined by the top oil of the transformer and the load current of the transformer. The temperature indicated by the transformer winding thermometer is the sum of the transformer oil temperature and the temperature rise of the coil to the oil, reflecting the temperature of the hot part of the measured transformer coil.
Winding thermometer,Oil level winding thermometer,winding temperature controller, winding temperature indicating controller
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