Circuits & Schematics - 3

TA Babu EDN LED technology is opening the door to a variety of high-power-illumination applications. The circuit in Figure 1 can let you know when ac power is available. To drive a power LED from the ac line requires a converter or a similar ...

Anthony Smith EDN Requiring no rectifier diodes, the positive peak-detector circuits in figures 1 and 4 exploit the open-drain output of a Texas Instruments TLC372 fast comparator, IC 1 . Both versions of the detector are simple and inexpensive and ...

Raju R Baddi EDN You sometimes need to know whether a resistance exceeds a preset limit. The continuity tester in Figure 1 lets you determine that fact for resistances of 0.5 Ω to 10 kΩ. The heart of the circuit is the transistor pair ...

EDN You sometimes need a current source for supply voltages as high as 1000 V or more. This current source can be useful for ripple-voltage reduction when the current source’s high-impedance node feeds an electrolytic capacitor to effectively ...

Bogdan Raducanu EDN Testing power supplies or discharging batteries usually requires a constant-current load. Sometimes, however, you must study the behavior when the load is a resistor. Using a highpower potentiometer is an expensive approach that ...

Tim Regan, Linear Technology Design Note 495 Introduction A circuit breaker protects sensitive load circuits from excessive current flow by opening the power supply when the current reaches a predetermined level. The simplest circuit breaker is a ...

Guy Hoover, Analog Devices Electronic Design A high-resolution SAR ADC often needs a higher-order antialiasing filter, such as the third-order version provided by this low-noise, low-power design. For many analog-to-digital converter (ADC) ...

Mark Vitunic, Analog Devices Analog Dialogue Question: My application doesn’t have a battery. Is it possible to power it wirelessly? Answer: Yes, sure a simple integrated nanopower solution originally designed for energy harvesting is ...

by John Betten EDN Controlling the brightness of LEDs requires a driver that provides a constant, regulated current. To achieve this goal, the driver topology must be able to generate a large enough output voltage to forward bias the LEDs. So, what ...

Ajmal Godil Electronic Design Consumer-based LED applications have really taken off. You now find them in home lighting, airplane cabin lights, automobile lights, MP3 players, and elsewhere. In the past, most LED drivers were based on some sort of ...