Articles and news - 4

Simple circuit shuts off system when
Simple circuit shuts off system when supply voltage is low
10.13.2022 Circuits

Many low-cost and portable systems, including small consumer electronic products, operate from unregulated power supplies such as batteries or external, plug-in “power bricks.” These power sources sometimes produce lower-than-nominal output voltages...

Precision DC motor speed control via
Precision DC motor speed control via pot or DAC
10.12.2022 Circuits

Ideally (in that magical land where theory and practice are the same thing), the speed of a permanent magnet DC motor is exactly proportional to the input voltage. But since real motors exist alongside us in the practical world, their behavior differs from this theoretical ideal...

China PCB Prototype and Fabrication Manufacturer
Cancel PWM DAC ripple analog subtraction
Cancel PWM DAC ripple with analog subtraction
10.11.2022 Articles

Every PWM DAC design needs analog filtering to separate the desired PWM duty-cycle-proportional DC component from unwanted AC ripple...

Smart ripple canceller offers near-zero dropout
Smart ripple canceller offers near-zero dropout
10.10.2022 Circuits

Ripple cancellers, also known as ripple-eaters, gyrators, or electronic filters, are useful when a supply needs to be clean but the absolute supply voltage is unimportant. A typical application of these circuits is in class-A power amplifiers...

Inductor-based astable 555 timer circuit
Inductor-based astable 555 timer circuit
10.06.2022 Circuits

The 555 multivibrator circuit has become a default choice of many hobbyists and even professionals in the past 50 years. Its pair of equations for frequency and duty cycle easily gives capacitor-resistor combinations which satisfy the required output...

Lowpass filter has improved step response
Lowpass filter has improved step response
10.06.2022 Circuits

A common problem that arises when you design lowpass filters for signal conditioning is the filters' effect on the system's time-domain response. Because pushing the cutoff frequency lower slows the step response, the system may fail to recognize significant changes within a reasonable amount of time...

STMicroelectronics expands 5V op-amp family optimize
STMicroelectronics expands 5V op-amp family, to optimize power and signal-conditioning performance
10.06.2022 News

STMicroelectronics has added the TSV782 high-performance dual op amp to its 5 V family, with 30 MHz gain bandwidth (GBW) and 50 µV (typical) input offset voltage for high-speed, high-accuracy signal conditioning...

Set DC-Motor Speed Light-Controlled Microcontroller Circuit
Set DC-Motor Speed with Light-Controlled Microcontroller Circuit
10.05.2022 Circuits

This 8051 microcontroller-based control circuit adjusts the speed of a small permanent-magnet dc motor via photosensors...

Current-Output Circuit Techniques Add Versatility Your
Current-Output Circuit Techniques Add Versatility to Your Analog Toolbox
10.04.2022 Articles

Although current mirrors and circuits such as the Howland current source are taught in analog circuit courses, a surprising number of engineers tend to think exclusively in terms of voltage when defining the output of precision analog circuitry. This is a pity, as current outputs offer advantages in a number of situations...

How Measure Op-Amp Input Capacitance Minimize
How to Measure Op-Amp Input Capacitance to Minimize Noise
10.03.2022 Articles

While measuring op-amp input capacitance, what should you focus on? The answer is that you must ensure the measurement accuracy isn’t degraded by the stray capacitance and inductance of the PCB or test setup...