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Showing posts from February, 2023

LED strip / lights connectors and maximum currents What happens if the installer chooses the wrong connector for the LED strip or fixture?

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What happens when a connector passes a high current? What is more dangerous - a thin wire or a low-quality connector? 1. The experiment's point LED luminaires use different connectors to connect the power supply and the light emitter or to extend the wires (for example). Manufacturers and retailers describe the current that can safely pass through the connectors for long periods. I want to test the connectors for LED lights and strips with the maximum current. I want to measure the heating of the connectors and answer the question - "can the connectors be used at the stated/specified current for a long time." I also want to determine the critical current level at which it is dangerous to use the connector. I want to determine the hazard by connector temperature (fire hazard) and smoke generation (poisoning hazard). Samples L814-L816 The first connector has different names. You can suggest variants in the comments or write me. I call this connector L814-L816 (also known as

Compact HDMI extender over a twisted pair network cable

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 It may not always be what you need! There aren't many consumers who pay much attention to design when choosing an HDMI extender over a twisted pair network cable. But it can be quite important in some cases. What if you choose a compact type of extender? If you remember, an extension kit includes a transmitter and a receiver. If you conduct a Google search, you will see a wide variety of HDMI extenders available on the market. All the extenders have HDMI inputs and outputs, as well as RJ45 twisted pair network cable ports. Some models have additional ports such as an IR, RS232, and others, which provide the devices with advanced features. But you can also find devices that are smaller in size than others. The transmitters and receivers of such devices normally include built-in HDMI plugs. Such an extender can seem like a good choice at first glance. A compact size, lower price, and no need for additional HDMI cables. So many advantages – you might be compelled to order one right n

How does a cable locator work?

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 This post contains a brief introduction to cable location principles. What does a typical locator consist of? Active/passive location methods. Cable connection methods. Determining the route of an underground cable or conduit is a common challenge. This challenge can be overcome with the help of special measuring devices. Although they have a similar principles of operation, they can have different names, such as cable locator, cable avoidance tool (CAT), underground wire locator, or cable tracer. Using these devices, it is possible to successfully determine the route of all sorts of cables (even fiber optical cables, given that they are equipped with a metal cordage or jacket). Moreover, these devices can sometimes detect the location of cable faults, such as cable damage or a short circuit. Locators that were used to search for metal objects underground were first introduced 40 years ago. Initially, they were only used to detect water, gas, or sewer pipes. Today this issue has becom

Thermal measurements of LED strips. Conclusions

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 How does the power consumption affect the LED chip heating? Can I mount the LED strip on the chipboard directly without the aluminum profile? Is COB technology really more efficient at dissipating heat from LED chips than traditional SMD technology? LED strip placement and measured data I have measured the LED strip temperatures in different strip placements. 1. LED strip suspended in the air. Air without motion (limited volume) has low thermal conductivity. But when air moves, the situation changes significantly. Air can pick up and take away a lot of heat, and this effect is used everywhere. For example, in computers, a fan is constantly blowing cold air through the processor's heat sink. This cold air takes excess heat from the processor and gets hot. And then the hot air is blown outside. The air moves near a hot object even without a fan. It is convection - warm air rises, and cold air falls. The LED chips are cooled by air convection in this placement. The air passing near t