DS

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 circuits 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 circuit 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...

For best efficiency,make good thermal contact between the 40 ohm resistor ,the TIP 122,the 3 diodes and the temperature controlled entity , the components all give off heat. We have some minor changes to the draft Roy. Roy A 4.7V zener is used in its original design and a resistor network, a range of operating temperatures of 188 degrees Kelvin to 243 Kelvin degrees C or -85 to -30 C. Temperature Regulator Circuit with TIP122 This is fine in Cryocam Roy, but I’m afraid that many of our camera cookbook may not be able to reach a maximum temperature of Roy. That and the fact that related to the Zener 4.7V difficult to replace me with Roy Z 5.1V zener with more accessible. This diode is available off the shelf at Radio Shack. I supply the resistor network on a range of 190 K to 270 K or -83 C to -3 C I believe that most of our cameras can be maintained to -3 C and I doubt that all our cameras in a position are to be attained – 83 C, so I think that this area should be good enough covera...