Using a 5V power supply in a 9V router circuit
Using a 5V power supply in a 9V router circuit
It seems your device might have issues with the adapter. Functions can fail, performance drops, and range gets affected. When under load, the router may shut down or operate poorly, leading to wear over time. Consider using a better adapter.
It likely includes a converter from 9V to 5V (or possibly lower). Using exactly 5V would increase current draw beyond normal levels. It will function, but the 5V adapter will be more demanding. If it doesn’t support a linear regulator for 5V, reliability may decrease.
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In recent years, most routers and switches don’t work with 9V or 5V directly. These devices usually include DC-DC converters that lower the voltage to levels like 3.3V, 2.5V, or even 1.8V. There are generally two main voltage ranges: those that handle up to about 5.5V–6V and those that can manage higher inputs. Choosing a converter that supports more than 5V often comes down to cost and reliability—cheaper and more dependable options use higher voltages. For instance, a router needing 10 watts could be powered by either 5V at 2A, 7.5V at 1.4A, or 9V at 1.1A. Higher current means thicker wires, which get hotter and wear out faster. Manufacturers often stock large quantities of adapters in one size to cover many devices, making it easier to fit into various models. While the converter might be tuned for peak efficiency around 9V, it still works reasonably well at lower voltages—around 36% efficiency at 3.3V or 44% at 12V. At 5V, efficiency drops sharply to about 66%. This means the design may not always deliver maximum power, especially if connected to more devices or higher loads, potentially causing instability or shutdowns.