Abstract : This paper describes the self-modification of a JSII type electronic time relay for use as a turn counter for a wire winding machine. Detailed control circuit wiring and modification principles are provided. Practical application shows that the system is stable and easy to use. Keywords : Time relay; Control circuit; Modification; Counter 1. Project Introduction Our company has three wire winding machines, whose electrical control system uses a dual-position counter to control the number of winding turns. Due to interference from other electrical equipment on site, the counter frequently malfunctions, affecting production process standards and wasting raw materials. Observation and analysis revealed that the main cause of counter malfunctions was interference, while the JS11 type electronic time relay installed nearby operated normally. Analysis showed that the electronic time relay has strong anti-interference capabilities and is inexpensive. Modifying part of the circuit for use as a turn counter for wire winding machines can not only meet production process requirements, improve counting accuracy, and reduce downtime, but also reduce equipment component costs and save money. 2. Modification Scheme and Project Implementation: The JS11 electronic time relay has a clock frequency of 50Hz (power frequency). After rectification by diodes D2, D4, D5, and D6, a 100Hz pulse wave is obtained on R01. This pulse wave is then shaped by the CD4069 gate circuit to output a standard rectangular wave of 100Hz per second, serving as the standard clock signal for time counting. When time counting is changed to engineering quantity counting, the circuit only needs to disconnect the 100Hz pulse wave sent to the CD4069 gate circuit, i.e., disconnect the circuit between points A and B in the circuit diagram. Connect the corresponding counting input circuit at point B, as shown in the lower left dashed box in Figure 1. Resistor R1 is connected to the rectified DC voltage, approximately 18V. R1 mainly serves as a current limiting protection in the circuit, with a resistance value of 47Ω. R2 and C1 form the input filter circuit, and the values ​​of R2 and C1 depend on the magnitude of the input counting pulse. The counting input circuit enters the input terminal of the CD4069 gate circuit, and the shaped rectangular wave serves as the counting pulse. [b][align=center]For details, please click: Converting the JSII type time relay into a counter[/align][/b]