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The alarm may be used for a variety of applications, such as frost monitor, room temperature monitor, and so on. In the quiescent state, the circuit draws a current of only a few microamperes, so that, in theory at least, a 9 V dry battery (PP3, 6AM6, MN1604, 6LR61) should last for up to ten years. Such a tiny current is not possible when ICs are used, and the circuit is therefore a discrete design.  Every four seconds a measuring bridge, which actuates a Schmitt trigger, is switched on for 150 ms by a clock generator. In that period of 150 ms, the resistance of an NTC thermistor, R11, is compared with that of a fixed resistor. If the former is less than the latter, the alarm is set off.  When the circuit is switched on, capacitor C1 is not charged and transistors T1–T3 are off. Circuit diagram : General-Purpose Alarm Circuit Diagram   After switch-on, C1 is charged gradually via R1, R7, and R8, until the base voltage of T1 exceeds the threshold bias.  transistor T1 then comes on and...

Welcome to the unofficial Kawasaki KLR250 information website. If you've just stumbled upon this site you may be asking what a KLR250 is, otherwise maybe you already know what it is and are just looking for more information. Well you've found the right spot. The Kawasaki KLR250 is a dual sport motorcycle that was produced between 1985 and 2005. A dual sport motorcycle is one that very much resembles an ordinary dirtbike but is completely street legal. Many riders choose to go with a dual sport, also known as a dual purpose, because it not only allows them to ride their bike back and forth to work, but also take on interesting offroad terrain when the desire hits them. The KLR250 is powered by a dual overhead cam (DOHC) 250cc 4-stroke gasoline engine that runs through a six speed manual transmission to a chain final drive. It was produced by Kawasaki in Japan and has been exported to many parts of the world including the United States, Canada, and Europe. During its lifetime it ...

Description The alarm may be used for a variety of applications, such as frost monitor, room temperature monitor, and so on. In the quiescent state, the circuit draws a current of only a few microamperes, so that, in theory at least, a 9 V dry battery (PP3, 6AM6, MN1604, 6LR61) should last for up to ten years. Such a tiny current is not possible when ICs are used, and the circuit is therefore a discrete design. Every four seconds a measuring bridge, which actuates a Schmitt trigger, is switched on for 150 ms by a clock generator. In that period of 150 ms, the resistance of an NTC thermistor, R11, is compared with that of a fixed resistor. If the former is less than the latter, the alarm is set off. When the circuit is switched on, capacitor C1 is not charged and transistors T1–T3 are off. After switch-on, C1 is charged gradually via R1, R7, and R8, until the base voltage of T1 exceeds the threshold bias. Transistor T1 then comes on and causes T2 and T3 to conduct also. Thereupon, C1 is...