Anti Theft System Alarm Circuit Wiring Diagramcircuit Schematic

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Anti Theft System And Alarm Circuit Wiring Diagram Circuit Schematic.

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Build LED Light Pen Schematic

Physicians and repair engineers often use small light pens for visual examination purposes. Rugged and expensive as these pens may be, their weak point is the bulb, which is a ‘serviceable’ part. In practice, that nearly always equates to ‘expensive’ and / or ‘impossible to find’ when you need one.

LEDs have a much longer life than bulbs and the latest ultra bright white ones also offer higher energy-to-light conversion efficiency. On the down side, LEDs require a small electronic helper circuit called ‘constant-current source’ to get the most out of them.
 
LED Light Pen Circuit Diagram


Here, T1 and R1 switch on the LED. R2 acts as a current sensor with T2 shunting off (most of) T1’s base bias current when the voltage developed across R2 exceeds about 0.65 V. The constant current through the white LED is calculated from

R2 = 0.65 / ILED
With some skill the complete circuit can be built such that its size is equal to an AA battery. The four button cells take the place of the other AA battery that used to be inside the light pen. Link

Author: Myo Min – Copyright: Elektor

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Recognizing and understanding schematic symbols

Schematic symbols are used to identify and graphically depict the function of fluid power components.Recognizing and understanding schematic symbols will enable you to comprehend a circuit’s function. Schematic drawings document the machine logic only and are never to be used as a piping diagram.Complete Symbols with Descriptions. Two position, two way, normally open plunger operated valve with a spring return. Two position, two way, normally closed direct solenoid operated valve with a spring return.Two position, four way, solenoid air pilot valve with spring return. Two position, four way, air pilot valve with spring return. Actuators perform the work in Fluid Power Circuits. They are used to clamp, move, rotate, turn and position. Cylinders are used for linear movements while rotaryactuators are used for limited rotational applications and air motors are used for continuous rotation.

Get from here to download Recognizing and understanding schematic symbols

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