Articles and news - 10

Frank J. Sprague man behind motors
Frank J. Sprague, the man behind the motors that remade the urban landscape
06.12.2024 Articles

Navigating the burgeoning cities of the early twentieth century would have been a very different experience without the electromechanical railway and elevator systems designed by Frank Sprague...

One microcontroller pin drives two LEDs
One microcontroller pin drives two LEDs with low quiescent current
06.11.2024 Circuits

The basis for this Design Idea is a circuit that uses three resistors and a microcontroller-I/O pin to work as input high impedance or output to independently drive two LEDs...

Solar constant lighting system uses PV-pushback-effect.
Solar constant lighting system uses PV-pushback-effect. Part 2 - System testing
06.10.2024 Circuits

Testing was done at various sunlight intensities. For any given sunlight intensity, VPV, IPV, VM, IM, etc., are measured...

Solar constant lighting system uses PV-pushback-effect.
Solar constant lighting system uses PV-pushback-effect. Part 1 - System description
06.06.2024 Circuits

Solar day lamps (SDLs) are made by simply connecting an LED array to a solar photovoltaic (PV) panel. SDLs represent a highly cost-effective way of utilizing solar energy for lighting. However, SDLs suffer from drawbacks such as daytime-only lighting, light-intensity fluctuations based on sunlight intensity, and low output on cloudy or rainy days...

Bias HF JFET
Bias for HF JFET
06.05.2024 Circuits

Junction field-effect transistors usually require some reverse bias voltage to be applied to a gate terminal. In HF and UHF applications, this bias is often provided using the voltage across the source resistor...

brief history switching power supplies
A brief history of switching power supplies
06.04.2024 Articles

The high-efficiency switching power supply has become a staple ingredient in many of today’s electronic systems. What is its origins and how has it evolved over the decades...

Relay solenoid driver circuit doubles supply
Relay and solenoid driver circuit doubles supply voltage to conserve sustaining power
05.30.2024 Articles

A generally accepted fact about relays and solenoids is that after they’re driven into the actuated state, only half as much coil voltage and therefore only one fourth as much coil power, are required to reliably sustain it...

Automotive DC motor pre-driver STMicroelectronics simplifies
Automotive DC motor pre-driver from STMicroelectronics simplifies EMI optimization and saves power
05.30.2024 News

The L99H92 automotive gate driver from STMicroelectronics provides an SPI port for programming and diagnostics, a charge pump, protective features, and two additional current-sense amplifiers for system monitoring...

How create dual-output voltage rail source
How to create a dual-output voltage rail with source and sink functionality for ATE applications
05.29.2024 Articles

This article details a method of generating dual-output voltage rails that provide both the positive and negative rails for a device power supply while requiring only one bidirectional power supply...

AA USB OK
2×AA/USB: OK!
05.28.2024 Circuits

While an internal, rechargeable lithium battery is usually the best solution for portable kit nowadays, there are still times when using replaceable cells with an external power option, probably from a USB source, is more appropriate...