Electronic thermometer has countless applications. Not everywhere can we use the standard mercury thermometer, for example, due to its size, frailty or the need to measure from the distance. The advantage of electronic thermometers are also small size and heat capacity of probes, faster response of the digital display and elimination
Click here to download the full size of the above Circuit.
of toxic mercury. Its output also can be used to electronically processed, record the measured temperature, alarm when temperature is changing or work as a thermostat. circuit LM35: To build an electronic thermometer, i used LM35 integrated circuit, linear temperature sensor in TO92 - 3 pin housing that provides voltage proportional to temperature in degrees Celsius on its output. Conversion of the output voltage is 10mV / °C and can therefore be used directly to display on the digital meter. As the display, ordinary multimeter or digital panel meter can be used. The thermometer can also be built into the multimeter. If matter that the displayed value has to be divided by 10, can be panel the meter or multimeter tightly associated with the meter modified to move the decimal point. If we build thermometer as a removable extension of multimeter, you can use a resistive divider, and thereby obtain transfer 1mV / °C and display in °C. With a conventional multimeter, which has a range of 200mV to 0. 1 mV resolution, we get a thermometer with a resolution of 0. 1 °C. LM35 can be used in addition to building an analog thermometer with analog meter. I have added the circuit suppression capacitors 100n, because when using thermometer near EMI generation electronics there were deviations of up to 10 °C. The thermometer I use, among other things to measure the temperature of heatsinks and switching power converters, and so it was not...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: