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Door/Window alarm circuit

Door or Window alarm circuit have been used widely in many homes to detect intrusion. A simple search in internet might fetch you lot of alarms for you to buy. But making your own alarm will be something special and that’s the purpose of this article. For this article i have reverse engineered a window alarm gadget to obtain the schematic design.   COMPONENTS REQUIRED: Piezoelectric element Transistors Resi ...

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Working with the Comparator Circuit

Sometimes in the embedded system world we need to process the analog world and sending the signal to the microcontroller when the analog signal exceed some predetermine limit we’ve set. Some example of this situation is to send the interrupt signal to the microcontroller operation when the temperature is already exceeds certain limit or the light intensity exceeds certain bright level. This is when the comp ...

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Prometheus: Circuit Boards in Minutes

Prometheus Prometheus makes real circuit boards in just minutes. When we're prototyping, we need a tool that can give us nearly instant feedback - not feedback that comes in a few week's time in the form of a PCB delivery. Let the PCB manufacturers make the hundreds or thousands of boards for your production run - not your prototypes. If production is your goal, Prometheus will help get you there faster. Th ...

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Password Based Circuit Breaker

Summary Electrical accidents are rapidly increasing especially electric line repairs incident due to the lack of communication and coordination between the maintenance personnel and the electric substation staff. The password based circuit breaker device could just be the solution as only the lineman could reliably control the circuit breaker to avoid miscommunication. The system requires a password to turn ...

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Passive Infrared Detector Circuit

Summary The infrared (IR) is invisible radiant energy, electromagnetic radiation that we cannot see with our eyes, but we can sometimes feel on our skin as heat. The infrared light falls just outside the visible spectrum, beyond the edge of what we can see as red. Most of the thermal radiation emitted by objects near room temperature is infrared. The circuit uses a MCP6032 microchip operational amplifier. T ...

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Overheat/Overcooling Circuit Breaker

Summary This project automatically switches off the electrical flow in event of excess heating or excess cooling thus protecting the circuit from damage using NXP NCX2220GU. The comparator guarantees to operate at low voltages which makes this device convenient for use in 5 V systems and has a typical internal hysteresis of 9 mV that allows for greater noise immunity. For overheat circuit breaker, reference ...

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Circuit adds foldback-current protection

  For many applications that require power-supply currents of a few amperes or less, three-terminal adjustable-output linear voltage regulators, such as National Semiconductor's LM317, offer ease of use, low cost, and full on-chip overload protection. The addition of a few components can provide a three-terminal regulator with high-speed short-circuit current limiting for improved reliability. The curr ...

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