Introducing a common reversing radar-----Ultrasonic detector

The figure below (omitted) shows the magnetic disc capacitors C1-C5 and C7~C9. When measuring with a multimeter, due to the small capacitance, the R×10k block should be selected. The needle cannot swing during measurement, otherwise it means that the capacitor has leakage.

This is the electrolytic capacitors C6 and C10, C11.

Note that electrolytic capacitors have positive and negative poles. The black line on the electrolytic capacitor is the negative pole of the capacitor, and the long pin of the electrolytic capacitor is the positive pole of the capacitor. Do not install it wrong. When measuring electrolytic capacitors, generally select the R×1k block. When measuring positive and negative, the needle has charging and discharging phenomena, which means that the electrolytic capacitor is good.
This is the picture after installing the resistor and capacitor (omitted).

4. Install the wiring bracket and IC socket.
The J1 wiring bracket of the P3502S board is 3×2P. The wiring bracket J1 of the P3502B board is 2P+2P, and J2 is 2P+2P. We assemble the wiring brackets according to the diagram, and then insert them into the circuit board and solder them.
When installing the IC socket, please note that the pins of each IC are different.
　　IC1CD4060 (16P)
　　IC2CD4020 (16P)
　　IC3CD4068 (14P)
　　IC4CD4093 (14P)
　　IC5CD4049 (16P)
　　IC6TL074 (14P)
When confirming the IC pin No. 1, follow the IC notch mark. When the IC pin faces you, count the pin numbers 1, 2, 3... in a clockwise direction. Insert the IC correctly into the circuit board and solder it, but do not rush to install the IC to avoid damage. Wait until all soldering is completed and debug before installing the IC integrated circuit.

This is the picture after installing the resistor and bracket IC holder (omitted).

5. Finally, install the diodes, transistors and other diodes D1~, there are 5 diodes in total. Use the multimeter R× block to measure the forward and reverse resistance of the diode. The black test lead with the smaller resistance is the positive pole of the diode.

　　There is only one transistor T1 BC547B
　　crystal X1: 5MHz

　　This is the picture after installing RV1, ×1, diode, and transistor (omitted).

Depending on the actual situation of the car, there are two ways to install the sensor:
　　(1) Vertical installation
　　(2) Horizontal installation
Install the sensor in the middle of the rear of the car, such as above or below the bumper, or drill a hole in the bumper and install the sensor directly on it. Note: When installing the sensor, make sure it is at a 90° angle to the horizontal plane.
Find a suitable location to fix the motherboard, the closer to the sensor, the better.
After all the circuit boards are installed and soldered, debug them.