Protecting the USB from over voltage and overcurrent threats

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https://www.electronics-lab.com/protecting-the-usb-from-over-voltage-and-overcurrent-threats/

An application note from Littelfuse about USB protection. This application note addresses the various requirements for protecting the Universal Serial Bus (USB) from overcurrent and overvoltage environmental threats. The solutions presented cover both USB 1.1 and the higher speed USB 2.0 circuitry. Specific emphasis is placed on USB 2.0 with information directed at hot connection […]

Measure small currents without adding resistive insertion loss

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https://www.electronics-lab.com/measure-small-currents-without-adding-resistive-insertion-loss/

by Maciej Kokot @ edn.com: In most cases, you measure current by converting it into a proportional voltage and then measuring the voltage. Figure 1 shows two typical methods of making the conversion. In one method, you insert a probing resistor, RP, in series with the current path and use differential amplifier IC1 to measure the resulting […]

USB power supply active load tester

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https://www.electronics-lab.com/usb-power-supply-active-load-tester/

Sasa Karanovic has designed and built a DIY USB power Supply active load tester, that is available at GitHub: USB Power supply Active Load Tester or short PAL Tester is unit designed for testing the quality of the power supplies. Idea was to create low-cost, precise device for simultaneous measurement of Voltage and Current drawn […]