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Will Hadden

The circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as four white LEDs from a 3.3 V source and adjusts the total LED current from 1 to ...

Damian Bonicatto Phoenix Bonicatto

When designing devices with microcontrollers (MCU), I like to use some of the analog-to-digital converter (ADC) inputs to measure onboard voltages along with all the required sensors inputs. This means I often run out of ADC inputs. So presented ...

Stephen Woodward

There’s been a lot of interesting conversation and DI teamwork lately devising circuits for ON/OFF power control using inexpensive momentary-contact switches (See Ref. 1 Ref. 4 ). Most of these designs have incorporated edge triggered ...

Tim Davis

Dual precision comparators are needed in many designs, such as for industrial and instrumentation applications, to generate accurate pulse-width modulated (PWM) waveforms with very high ( 99%) and very low ( 1%) duty-cycle percentages. This design ...

Mike Wong Tamara A. Papalias

A stable voltage from an input supply that is higher and lower than the output is often required. A common solution is to use a boost converter followed by an LDO as shown in Figure 1. The boost converter is configured to accept voltages ranging ...

Vijay Deshpande

This modular resistor load bank uses a unique topology to reduce the number of switches and resistors while providing the maximum number of steps. An array or bank of load resistors is often required for testing power products, characterization of ...

Rod Elliott

Introduction In general, muting and/or signal switching is done by relays, FETs or CMOS analogue switch ICs. All have limitations, but a little known technique that really doesn't look like it could ever work is to use bipolar transistors. The ...

Stephen Woodward

Famous analog designer and author Jim Williams published an awesome design in 1986 for a 100-MHz voltage to frequency converter ( Ref. 1 ). He named this high-climber (picture it on the roof of the Empire State building swatting biplanes out of the ...

Stephen Woodward

Frequent design idea (DI) contributor Nick Cornford recently published a synergistic pair of DIs “A pitch-linear VCO, part 1: Getting it going” ( Ref. 1 ) and “A pitch-linear VCO, part 2: taking it further” ( Ref. 2 ). The ...