Inrush limiter also provides short-circuit protection
Inrush limiter also provides short-circuit protection
01.24.2022 Articles

For containing large amounts of bulk capacitance, controlling inrush currents poses problems. The simplest approach involves placing an inrush-limiting resistor in series with the capacitor bank, but a resistor wastes power and adds a voltage drop...

High-Power White LED Driver Runs Battery-Operated
High-Power White LED Driver Runs Battery-Operated Portable Lighting
01.23.2022 Circuits

Many people consider white LEDs to be the future of lighting. Strung together, several LEDs can replace an incandescent lamp or a compact fluorescent lamp. High-power white LEDs need a dc voltage of about 3.6 V at a current of about 350 mA to achieve full brightness...

Single-wire keypad interface frees microcontroller-I pins
Single-wire keypad interface frees microcontroller-I/O pins
01.20.2022 Circuits

If you use a microcontroller to detect a key closure, checking the states of (x+y) lines requires an equal number of I/O pins. Occupying only one free I/O pin, the circuit communicates with a microcontroller...

Reversed Capacitor Causes Motherboard Fires
Reversed Capacitor Causes Motherboard Fires
01.20.2022 News

Asus has recalled many of the company’s ROG Maximus Z690 Hero motherboards after reports that the boards could catch fire due to a capacitor that was aligned wrongly...

Reduce voltage-reference output noise by half
Reduce voltage-reference output noise by half
01.18.2022 Articles

Reducing low-frequency (1/f) noise generated by an IC voltage reference can prove difficult. In theory, adding a lowpass filter to a reference's output reduces noise. In practice, a lowpass RC filter...

Germanium Dual-Boost Starts 260 mV
Germanium Dual-Boost Starts At 260 mV
01.17.2022 Circuits

No matter what portable power source you use, the lower the starting voltage your circuitry operates at, the better. A lower startup voltage also maximizes runtime...

Low cost high-performance signal generator board
Low cost, high-performance signal generator board
01.17.2022 News

MikroElektronika has launched the Waveform 4 Click board – a member of its +1000-strong Click family of peripheral development boards – that operates as a signal generator for high-speed, high-dynamic-range, multichannel complex waveforms...

Simple Circuit Reduces Relay Coil Power
Simple Circuit Reduces Relay Coil Power
01.13.2022 Circuits

Fellow engineer Sanjay R. Chendvankar recently offered a novel way of reducing current through a relay coil. His idea utilized an unused normally closed pair of contacts of that relay...

Full-wave signal rectifier uses just one
Full-wave signal rectifier uses just one transistor
01.11.2022 Articles

The simple circuit shown accomplishes full-wave signal rectification with only one transistor. This is done by exploiting the “gain reversal” phenomenon exhibited by a saturated bipolar transistor...

Tuning Quadrature Encoder by Ear
Tuning a Quadrature Encoder by Ear
01.10.2022 Articles

The human ear is very good at detecting noise or missing cycles in a waveform, and since we have two ears, we can monitor two signals at once. I recently repaired an older lab instrument containing a quadrature encoder made with an incandescent lamp...