Showing posts with label diode. Show all posts
Showing posts with label diode. Show all posts
Wednesday, October 1, 2014
Super Zener Diode Circuit Diagram
- Although the temperature coefficient of the super zener circuit can be optimized by careful dimensioning of the components, there exists a still better way for making a precision voltage reference.
- It is generally known that the accuracy of measurements in electronic circuits is mainly a function of the stability and reliability of the reference against which the unknown quantity is compared.
- The zenerdiode in Fig. l is a usable reference device for , applications where the above i three parameters are not subject to appreciable variation.
- The "super zener" in Fig.2 features excellent stability and is hardly affected by variations in the supply voltage and the load current.
- The term band gap refers to the difference between two discrete energies of the outer four electrons in a semiconductor atom. Electrons in the highest energy band contribute to the conduction of the material.
- There fore, everything feasible should be done to maintain the stability of the reference, i.e., counteract the adverse effects of variations in the ambient temperature, supply voltage, and load current.
Friday, August 22, 2014
Simple Temperature Sensor Circuit using 1N4148 diode
There are components that have special characteristics, one of them is the 1N4148 diode, it is a diode High-speed, and its switching speed is 4th, its voltage is 100 V and current of 450 mA. It besides a diode 1N4148 is used as the temperature sensor, that due to its characteristics that cause it to change its resistance with temperature change. Of course it does not compare to a sensor like the LM38, but for some diagram of low precision, which just need to know if an element is hot or cold it is very useful.
Temperature Sensor Circuit using 1N4148 diode Diagram
Using the multimeter and the 1N4148 as a thermometer
The scheme above is a schema that measures the temperature in a simple manner using a multimeter. It uses 1N4148 diode, and VR1 and VR2 must be adjusted with a thermometer, and is more precise measurement. On the scale of the multimeter can be compared to the scale of degree Celsius with Volt.
The scheme above is a schema that measures the temperature in a simple manner using a multimeter. It uses 1N4148 diode, and VR1 and VR2 must be adjusted with a thermometer, and is more precise measurement. On the scale of the multimeter can be compared to the scale of degree Celsius with Volt.
Temperature sensor with diode 1N4148
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