The six-leg switch, often referred to as the six-leg self-locking switch, is essentially a double-pole double-throw (DPDT) switch. It features a total of six pins arranged in two rows of three each, with the middle pin serving as the common terminal. This common pin corresponds to the left and right legs, offering both normally closed (NC) and normally open (NO) configurations for each side. Importantly, the two groups are entirely independent unless physically connected on the PCB.
To better visualize its structure, consider the accompanying image of a six-leg button switch. The schematic illustrates how the switch operates, with the middle pin acting as the central point of connection. For instance, when pressed, the connection shifts between NO and NC contacts, allowing for flexible circuit control.
Connection methods depend on your application. For example, connecting the common point (pin 1 or 4) to either the NO (pins 3 or 6) or NC (pins 2 or 5) determines whether the switch operates in a normally closed or normally open mode. If you’re using this switch for a single function, you could simply connect pin 1 to 2 or pin 2 to 3, depending on your desired outcome.
A key aspect to note is that each row functions as an individual single-pole double-throw switch. When determining which side is NO or NC, you can label them accordingly during the soldering process. For those seeking clarity, the schematic provided shows the switch’s internal wiring, where only the connections marked by black lines are active, while others remain disconnected.
In terms of packaging, the six-pin self-locking switch uses the KFT-7 format. The pin spacing details are as follows:
- Distance between pins 1 and 2: 2.54 mm
- Distance between pins 3 and 1: 5.08 mm
For those struggling with PCB layout issues involving six-legged buttons, here’s some practical advice. To identify the correct pins, use a multimeter to test continuity. Press the button and check which pins show connectivity; these will be your NO and NC pairs. Additionally, ensure that your PCB design aligns with the switch's physical layout to avoid misconnections.
Here’s a quick summary of troubleshooting tips:
1. Confirm the switch type and verify the pin configuration.
2. Use a multimeter to confirm which pins are NO or NC.
3. Double-check your PCB layout to ensure proper alignment with the switch.
By following these steps, you’ll ensure smooth integration of the six-legged self-locking switch into your project. Remember, understanding the switch’s internal wiring is crucial for successful implementation.
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