How To Set Dip Switches
DIP switch can exist defined as an array of elementary two terminal On-Off electromechanical switches (Single Pole Single Throw) that are commonly used in electricity operations. The word DIP is an acronym for Dual In-line Parcel which means that the electrical contacts are in two rows. DIP switches are surface mountable and are used in those applications where multiple numbers of switches are involved in output generation. For instance, in a universal remote command, the DIP switch is used to set the frequency according to the device that is being operated. On a reckoner motherboard, DIP switches assist in optimizing the clock speed and configuration settings co-ordinate to the type of processor mounted.
Depending on the number of miniature switches in the assortment and the awarding, DIP switches can be rotary, slide contact, rocker contact etc. Let u.s.a. explore the skeletal innards of ane such device.
Fig. 1:Prototype Showing a DIP Switch
Outer Structure
Fig. 2:Outer Structure of a Sliding Type DIP Switch
Shown in the epitome above is a sliding blazon DIP switch. It is a combination of eight switches and hence has full 16 pins equally divided into two rows, thus making it a 16 pivot Dual In-line Package Switch (DIP). Information technology is similar to an IC in its shape and size so that information technology can be easily mounted on a PCB. The switches are made of flexible materials like polyamide (Nylon) that tin withstand operational jerks when switching rate is high. The casing is made of heat-resistant thermoplastic polymer made from polybutylene terephthalate and likewise contains a flame retardant epoxy.
Fig. 3:Top View of DIP Switch Showing Sliders and ON Position
From the top view, sliders and the ON position can be seen. The plastic casing has guide-means on its elevation that contain the sliders. The frame dimensions take to be precise so that the sliders tin exist exactly placed over ON and OFF states.
Fig. 4:Bottom View of DIP Switch Showing its Various Parts
The bottom view of the switch shows the connecting terminals of the DIP spring to the structure with the aid of a strong adhesive. The connecting leads are made of bronze over which tin can is coated.
Internal Construction
Fig. 5:Internal Structure of DIP Switch Showing its Contact Pins
The removal of peak casing and the switch sliders reveals the switch assortment. The black base over which the contacts are placed is made of same material with which the casing has been made. The contact pins are fabricated of statuary. In order to protect the pins from corrosion, they are plated with gold. The pick of coating material is ofttimes dependent on ratings of the switch, gold being preferred for dry out, low power situations. Also, they are dipped into sulfide and then that the contact resistance is to the lowest degree affected by chemicals present in the atmosphere. Sulfides are known to deposit quickly on a metal surface and change its contact resistance. Simply their deposition slows the reaction charge per unit with which other chemicals can interact with the metallic. Hence, they serve every bit efficient protector of the metallic contacts.
Fig. vi:Dissected View of DIP Switch Part
For every switch, a pair of contact pins is there. In each pair, one contact is flexible while other is stationary. All the switches are contact isolated from each other so that no output variations are there. The flexible part has a leaf spring shape which helps in optimizing the slider in terms of strength required to switch position from 0 to i. Whenever a slider is switched from 0 to 1 position, the flexible part bends downwards to establish contact with the stationary contact.
Pins & Switching
Pins
Fig. 7:Types of Pins—Leaf Jump and Stationary Contact Pins
Separately shown above are the flexible pin and the stationary contact pin of the switch. The leaf spring is formed from the same plate with which the connecting pin is formed on the office following the right angled bend. The uttermost end of this leaf spring is curved outwards to have maximum contact area with the fixed contact.
Switching
Fig. 8:Switch ON and OFF Mechanism
When pushed to 1 (ON) position, the slider moves to that curved part of the flexible pivot which pushes the leaf bound downwardly, establishing contact between the 2 plates. When the slider moves dorsum to its 0 (OFF) position, the restoring forcefulness of the leaf spring restores it to the neutral, open up condition.
Based on the application, electric configuration for a DIP Switch is adamant in terms of electric current, voltage and power ratings. As they are used for On-Board configuration, these settings are pre-defined in a range making them application dependent. The ratings are life tested by manufacturers and signify the recommended working weather. Paying no heed to such ratings can lead to bug like self-welded switches, electrical arching while switching etc.
Dip switches accept been used in electronics since a long time and even though faster CMOS based switching circuits have arrived, former are however in tendency in MSI and LSI circuits. The output in a DIP switch is strictly dependant on what slider positions to "On". Thus the combination of switches tin can be used to generate various outputs which in turnreduce the hardware requirement by a meaning amount.
Filed Under: Insight
Source: https://www.engineersgarage.com/insight-how-dip-switch-works/
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