May 15 2008 12:00AM | Permalink | Email this | Comments (0) |
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You can employ a pin-limited microcontroller to develop a suitable dc/dc-boost-voltage converter with the aid of a few discrete components. Tiny microcontroller hosts dual dc/dc-boost converters details a simple circuit where a microcontroller powered by an AAA cell generates a high enough voltage to backlight an LCD.

Small capacitor supports telecom power supply during brownouts shows how to keep telecom equipment operational during a short brownout. The circuit charges a relatively small capacitor to twice the supply voltage to achieve brownout ride-through.

Overlap—the short period during which a push-pull drive's two transistors are both simultaneously on&mdas...Read More

May 1 2008 8:08AM | Permalink | Email this | Comments (0) |
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The Design Idea in Circuit and software provide accurate recalibration for baseline PIC microcontroller's internal oscillator uses three I/O lines to recover the internal calibration value by recalibrating against a reference clock, the 4-MHz crystal.

The method in Microcontroller moving-dot display interface uses three I/O lines needs three output lines—data, clock, and latch—and requires some firmware and hardware. The moving-dot display has some benefits over the bargraph display: It better indicates a location of detected object in sonar and radar applications; it needs only one LED's current-limiting resistor instead of several; and it provides the same current ...Read More

Apr 17 2008 8:34AM | Permalink | Email this | Comments (0) |
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Peltier devices, also known as solid-state refrigerators, or TECs (thermoelectric coolers), actively cool temperature-sensitive electronic components, such as optical detectors and solid-state lasers. However, one TEC data sheet proviso that designers sometimes miss is that you always measure these parameters with the TEC mounted on an effectively zero-thermal-impedance—that is, perfect—heat sink. Use thermoelectric coolers with real-world heat sinks presents derating curves for TECs.

Interface MIDI instruments to a PC through a USB port uses the FT-232BM from Future Technology Devices International, a USB-to-UART interface IC t...Read More

Apr 3 2008 12:00AM | Permalink | Email this | Comments (0) |
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Chop the noise gain to measure an op amp's real-time offset voltage introduces a new type of chopping. "Chopping the noise gain" is a simple way to measure the offset voltage in real time, so that you can subtract it and enhance DC precision.

The circuit in Simple analog circuit provides voltage clipping and dc shifting for flash ADC converts a symmetrical inputvoltage range of 20.2 to 10.2V into the recommended 0.6 to 2.6V range of an ADC. The circuit also prevents the output voltage from going below –0.3V, which would probably damage the ADC.

Compact lase...Read More

Mar 20 2008 12:00AM | Permalink | Email this | Comments (0) |
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To discover potential power-supply problems, you must run dynamic and static tests. The simple current sink in Precision voltage-controlled current sink tests power supplies tests low- to medium-power supplies and voltage sources. The current sink can draw current of 0 to 1.5A for an input-voltage range of 0 to 5V with a supply voltage as high as 20V.

Ordinary red LEDs normally function as light emitters, but they can also function as photosensors. In Red LEDs function as light sensors a single LED can even function as both a light emitter and a light detector in the same circuit . The basic idea is to pulse the LED, using the on-time to light it and the off-time to sense the ph...Read More