Articles and news - 3

Control accurate incremental voltage steps rotary
Control accurate incremental voltage steps with a rotary encoder
04.19.2022 Circuits

Experimenting with an HF oscillator, I needed to control the varactor diode voltage in precise increments over a 2 V-10 V range. A buffered potentiometer was the obvious choice, and connecting two pots in series to give coarse/fine control...

White-LED driver operates down 1.2V supply
White-LED driver operates down to 1.2V supply voltage
04.18.2022 Circuits

Many LED drivers, using both charge pumps and inductors, are available to boost the 1.2 to 2.4 V available from single- and dual-cell NiMH (nickel-metal-hydride) batteries to the 3.6 V that white LEDs require...

Create Versatile Voltage-Controlled Voltage Regulator Based
Create a Versatile Voltage-Controlled Voltage Regulator Based on the LP2951
04.15.2022 Circuits

The LP2951 voltage regulator is commonly used in applications requiring a preset output voltage, which can easily be configured using two resistors. The device provides low dropout regulation over a wide range of output voltages ranging from 1.235 V to around 30 V...

John Roach Remembering personal computer era
John Roach: Remembering the personal computer era pioneer
04.14.2022 News

Personal computer era pioneer John Roach passed away in Fort Worth, Texas, at 83. Though widely acknowledged as a marketing visionary, he is known to have played a pioneering role in commercializing the complete, pre-assembled computers during the 1970s...

Synthesize variable resistors hyperbolic taper
Synthesize variable resistors with hyperbolic taper
04.13.2022 Circuits

In adjustable, frequency-selective RC networks, the reciprocal of an RC product, ωC = 1/RC, determines the corner frequencies of the network...

PWM Generators Independent Adjustments
PWM Generators with Independent Adjustments
04.12.2022 Circuits

The circuits of PWM pulse generators with independent frequency and duty cycle adjustments are described. The first one uses the TLC555 IC and an external master pulse generator on the CD40106 IC...

Vishay Intertechnology Introduces New R25 Values
Vishay Intertechnology Introduces New R25 Values for Automotive Grade, Glass Protected NTC Thermistors in 0603 and 0805 Case Sizes
04.12.2022 News

Vishay Intertechnology announced that it has extended its NTCS0603E3.....T and NTCS0805E3.....T series of Automotive Grade, glass protected NTC thermistors in the 0603 and 0805 case sizes with new electrical resistance values at +25 °C (R25) ...

Current-Feedback Op Amps Save Power Photodiode
Current-Feedback Op Amps Save Power In Photodiode Apps
04.08.2022 Circuits

Current-feedback amplifiers offer high bandwidth with minimal power-supply current draw. However, they're rarely used as transimpedance amplifiers in photodiode applications due to the high current noise of their inverting inputs...

Isolated AC linear power control
Isolated AC linear power control
04.07.2022 Circuits

Power control using the linear region of an active device, such as a MOSFET, is not an efficient option. However if the range of power control is restricted to the lower or upper end of the range, using the linear region is not a bad choice...

Sampling peak detector has shutdown feature
Sampling peak detector has shutdown feature
04.06.2022 Circuits

You face a serious problem in using a slow ADC with a fast peak detector. The circuit allows a slow ADC to measure a fast, sampled signal peak...