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, corresponding to the left and right legs. One row is typically configured as normally closed (NC), while the other row is normally open (NO). Both rows are independent of each other, meaning their operation does not affect one another unless specifically interconnected on the printed circuit board (PCB).
For example, when pressed, the NC contact will break, and the NO contact will make, providing a switching action between the two states. This independence between the two poles makes the six-leg switch particularly useful in applications requiring dual circuits or multiple switching functions.
To understand its wiring, consider the following: Pins 1 and 4 serve as the common terminals, while pins 3 and 6 act as the normally open contacts. Pins 2 and 5 would then be the normally closed contacts. Depending on your application, you can connect these pins in various ways. For instance, connecting pin 1 to pin 2 creates a normally closed circuit, whereas linking pin 3 to pin 4 provides a normally open configuration.
A schematic diagram can help visualize this setup. Each row functions as an individual SPDT (single pole double throw) switch. By identifying the common pin—typically the middle one—you can determine which side is open or closed. This identification can usually be resolved during the soldering process.
It’s worth noting that many online resources incorrectly describe the principles of the six-pin self-locking switch. However, here's a corrected schematic illustration. In the provided image, only the sections highlighted by black lines represent actual connections; all other areas remain unconnected.
Regarding the physical packaging, the standard name for this switch is KFT-7. 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
When working with six-pin button switches on a PCB, it’s essential to ensure proper placement and connectivity. Testing methods include using a multimeter to check continuity. If pressing the button results in two terminals being connected and disconnected upon release, those terminals are correctly identified.
In my experience, two such six-pin switches I’ve used were straightforward to integrate into designs. To verify their functionality, simply apply a multimeter to measure continuity changes when the button is pressed and released. This approach ensures accurate identification of the required terminals.
Overall, understanding the six-leg switch requires attention to both its mechanical and electrical properties. Proper integration into PCB layouts ensures reliable performance across various applications.
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