Isolated Circuit Digitally Indicates 120-/220-V Line Voltage
https://www.electronics-lab.com/isolated-circuit-digitally-indicates-120-220-v-line-voltage/
Edward K. Miguel @ electronicdesign.com has published a circuit that has output high when the votlage in input is 220V and output low when the voltage is 110V. This is often useful on motor control and power supply systems. The circuit illustrated in the figure monitors the ac line and provides a basic output indicating whether […]
Protecting the USB from over voltage and overcurrent threats
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 […]
Analog Devices AD587KN 10V reference chip
https://www.electronics-lab.com/analog-devices-ad587kn-10v-reference-chip/
SteelCity Electronics published an article about Analog Devices AD587KN 10V reference: I recently got hold of an Analog Devices AD587KN high precision 10.000V reference chip. This model of chip has an output value of 10.000V ± 5mV (that is, an output value of 9.995V to 10.005V) straight out of the factory. A voltage drift of […]
Lowest-drift bandgap voltage reference reaches 1.5ppm/°C, offers low dropout
https://www.electronics-lab.com/lowest-drift-bandgap-voltage-reference-reaches-1-5ppmc-offers-low-dropout/
by Graham Prophet @ edn-europe.com: LT6657 is a family of ultra-stable bandgap voltage references that exhibits less than 1.5ppm/°C of temperature drift. Reinforcing this performance, the device has only 0.5ppm p-p of low frequency noise, less than 30 ppm of long term drift and 35 ppm of thermal hysteresis. The LT6657 is fully specified for –40°C […]
Voltage indicator transitions between colours
https://www.electronics-lab.com/voltage-indicator-transitions-between-colours-2/
by Einar Abell @ edn.com: This Design Idea gives two versions of an indicator light that changes from green to red as a battery discharges. There are many circuits that do this sort of thing, but all the ones I have seen are too complex and costly for my taste. This DI shows a method […]
USB power supply active load tester
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 […]
50,000V High Voltage Power Supply
https://www.electronics-lab.com/50000v-high-voltage-power-supply/
by Victor8o5 @ instructables.com: This high voltage power supply has been designed to output a fixed voltage of around 50kV, it could easily be converted to an adjustable supply by connecting a variac in case of using transformers or by adding some extra circuitry to regulate the power going in. I initially thought about a high […]