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292 results found, displaying items 261 - 280
Build A Zero-Power Switch Supervisor
A recent project requirement specified the need for a special indicator to show whether a security switch was used during the time the system was powered off. Because our system has a real-time...
Low Noise Power For Thermoelectric Coolers
Thermoelectric coolers (TECs) are used to cool high-sensitivity transducers, such as CCDs and photodiodes, in an effort to raise their performance even further. Powering these TECs presents an...
IGT Creates A Low-Cost Off-Line "Hiccup" Supply
In equipment requiring a standby mode (e.g., VCRs, TVs), you must still supply power to the microprocessor when everything is asleep in order to receive and interpret the wake-up signal from the...
IGBT powers ultra low-cost offline wall adapter
Universal ac-to-dc wall adapters need to be light and compact to meet international traveler requirements. In that regard, switchedmode power supplies (SMPS), are the natural candidate for these...
A Simple DC Motor Controller Optimizes Battery Life
Many cordless tools use NiCd battery packs as a source of power. These battery packs typically consist of four to six NiCd cells. Some of the tools also have more than one speed. This is achieved...
Power amplifier buffer features digital bias adjustment
The day may be near when every amplifier application can be served simply by finding the right off-the-shelf standalone chip. Maybe. But for now, many jobs require that even the best monolithic devices be supplemented with a sprinkling of active...
Maximum-power-point-tracking solar battery charger
Sustainable electrical sources like solar photovoltaic arrays are becoming increasingly important as environmentally friendly alternatives to fossil fuels. But, while they’re nice for the environment, sustainable sources aren’t always easy to apply....
Simple Soft-Start Circuitry Provides Long Startup Times
Many dc-dc converters require relatively large amounts of input current at startup (when input power is first applied). A soft-start function minimizes this large input current by gradually increasing the switch-current limit at startup, slowing the...
Temperature-Compensated LCD Bias Supply Uses A Single Control IC
Many applications require a simple method for getting multiple outputs from the power supply. One way to achieve this goal is by using charge pumps. The schematic shown in Figure 1 is an LCD bias...
Wide-Range Programmable Negative Regulator Conserves Power
The circuit described here supplies 0 V to −40 V for those applications that require a variable programmable power supply, such as in automated testing systems, battery-discharge-curve simulation, and when driving heating elements to various...
Power interruption tester for restart circuit
Compressors are susceptible to brief power interruptions as short as 30 ms or 2 cycles of ac power. Even these short “glitches” may cause a pump to stall when it’s under load. To alleviate this potential hazard, a restart circuit was designed. It...
Current-sensing LDO voltage regulator
When designing battery-operated devices, battery contact chatter can be prove to be a difficult problem to overcome. When the chatter occurs at a critical time, the results can often be devastating. For instance, if a memory write takes place during a...
Adjustable LNB power supply is DiSEqC-compatible
The circuit shown provides a digitally switchable 13 V or 17 V for the low-noise block (LNB) typically found in satellite receivers at the antenna feedhorn. This variation of supply voltage “tells” the remotely located LNB electronics whether it...
A complete battery backup solution using a rechargable NiCd cell
Battery-powered systems, including notebook computers, personal digital assistants (PDAs), and portable instruments, require backup systems to keep the memory alive while the main battery is being replaced. The most common solution is to use an...
Digital logic interface for power-MOSFET control
Power MOSFETs have become increasingly popular for use in numerous high-power applications. But the major drawback of a typical industrial power MOSFET is that it requires a minimum gate threshold voltage of about 4 V (preferably about 8 V for...
Regulated LCD-bias generator requires no inductor
Astringent height limitation on pc boards employed in PDAs and palmtop computers requires using expensive, low-profile inductors in switchmode power supplies. As an alternative, however, you can replace certain switchmode circuits with one based on...
High-voltage power pulse circuit
Fast rise-time high-voltage pulses have many uses ranging from EMC testing to device characterization. The simple, low-cost circuit described here deals with the latter. It’s able to generate 0- to 1000-V pulses with currents up to 50 A, and a rise...
A PC printer-port-based 12-bit AC power controller
Athyristor switch typically is used when controlling power in the kilowatt range. In a thyristor, the output power is controlled by controlling the time (or phase angle) during which the thyristor remains “closed” in a conduction cycle. To control...
Create a quiet −5 V supply for 14-bit ADCs
Many high-performance data-acquisition systems reap multiple benefits when using ±5-V supplies rather than a single 5-V supply. These benefits include the ability to handle larger signal magnitudes than is possible with a single 5-V supply. This...
High-voltage adjustable shunt regulator
Occasionally, the need arises for a variable shunt regulator capable of high-voltage operation. At high voltages, multiple transistors in series overcome safe-operating area (SOA) limitations much more effectively than parallel configurations....
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