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EDN Asia's top 10 Design Ideas of 2013

22 Jan 2014

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Measure currents without resistive insertion loss

In most cases, you measure current by converting it into a proportional voltage and then measuring the voltage. There are two typical methods for making the conversion: You either insert a probing resistor, RP, in series with the current path and use differential amplifier IC1 to measure the resulting voltage drop, or use operational amplifier current-to-voltage converter in which inverted IC1's output sinks the incoming current through the feedback resistor.

Simple diode acts as sensor for thermal probe

This article describes a two-transistor thermal probe for identifying circuit problems such as hot components and thermal runaway. Although the probe does not provide an accurate temperature measurement, it acts as a quick check for potential thermal problems by simply probing a suspicious component with the sensing diode.

LED intrinsic capacitance works in 650-mV LRC IC

You can use the inherent capacitance of an LED to make a series resonant boost circuit that can create a voltage large enough to light the LED. Depending on the colour of the LED, you need a voltage higher than 1.6V to turn it on. The threshold, or knee, voltage rises higher as the LED wavelength becomes shorter.

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