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AC to DC & DC to DC
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Video Wall circuits
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8051 / 8052
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Remote Control Toy
H Bridge Circuit
Interconnection & Timing
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4 Band Resistor
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Meter Counter Circuits
Fishing Thermometer Project Circuit
This simple to construct water fishing thermometer circuit is intended to be used in sports applications like for example a fishing contest. A sensor measu..
Diode Digital Thermometer Circuit
This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV/°C is ex..
Coffee Thermometer Circuit
The circuit featured here is very useful to save you from burning your tongue. The coffee thermometer is composed of a voltage regulator, a temperature to voltage converter, a comparator and two LEDs. Roughly described, the circuit works this way: if the coffee temperature is not hot enough, the IC output is logical 0 and T1 does not conduct...
thermometer pic microcontroller lm35
Digital Remote Thermometer
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and shows the coun
Digital Remote Thermometer circuit
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and...
AT89C2051 Digital Thermometer and Clock
The MCU is ATMEL 89C4051 CMOS Microcontroller having 4kB code memory, 128 bytes On-chip RAM and 8-bit Port1 and Port3. The A/D chip is HARRIS CA3162, 3-digit DVM. The A/D converter employs dual-slope integrator providing 10Hz sampling rate. Digital output sent to MCU is multiplex four bit BCD started from MSD, LSD and NSD respectively.
This LED thermometer is designed for in home use, to read temperatures between about 60 and 78 degrees Fahrenheit. It is based around a precision temperature sensor IC, the LM34DZ. This sensor require no calibration and can measure temperatures of between -50F and 300F. While the circuit shown here does not use the full range of that sensor, it ca
Digital thermometer circuit
A very precise digital thermometer with LM35 probe (0, 1 degree of freedom). The circuit has two adjustments. One of them, R5, adjusts the displays to 0. To perform this, we have to connect the extreme part of R4 (that goes to the temperature probe) to the ground and we turn R5 until we see 0:0:0. Afterwards, we connect the probe LM35 to terminals
Digital Remote Thermometer
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and show
digital thermometer or talk I2C to your atmel microcontroller
A pre-requisite for this article is that you have the GCC AVR programming environment installed as described in my "Programming the AVR microcontroller with GCC, libc 1. 0. 4" article. If you want to avoid troubles with the installation you can of course use the AVR programming CD from When you use such an advanced device as a microcontroller
lf365 A digital thermometer or talk I2C to your atmel microcontroller
The Atmega8 microcontroller from Atmel has plenty of digital and analog input/output lines. It is the ideal device to develop any kind of measurement equipment. A pre-requisite for this article is that you have the GCC AVR programming environment installed as described in my "Programming the AVR microcontroller with GCC, libc 1. 0. 4" article. If y
DS1820 thermometer circuit
This DS18S20 digital thermometer provides a precision of 0. 5 °C and SCRATCHPAD it`s read at every 800ms. Capacitors C5, C6 and diodes D8, D8 makes a voltage doublers which power the lcd panel. The DS18S20 temperature sensor it`s wrapped in a thermo contractil tube. For connection cable I chose a type used in audio (coaxial stereo) that is only 1 m
DIGITAL THERMOMETER CIRCUIT
This circuit is composed of a temperature sensor, amplifier, V/F converter, three digit binary coded decimal (BCD) counter, time base and seven segment led displays. In addition to the 9400 V/F converter, other ICs need for this project include the LM334 temperature sensor, LF353 dual op amp, NE555 timers, 74LS00 NAND gate, MC 14553 three digit
Thermometer meter slinger 2
The thermometer meter slinger circuit is composed of power supply circuit and meter slinger timing control circuit, it is shown in the figure 9-135. The power supply circuit is made of fuse FU, power supply button S(Sa, Sb), resistors R1, R2, capacitors C1, C2, power supply indication LED VL, steady voltage diode VS and rectifier diodes VD1. The m
Using LB1413 as electronic thermometer circuit diagram
LCD electronic thermometer circuit
Related components PDF download: ICL7106CD4036 The LCD electronic thermometer The LCD electronic thermometer circuit is as shown. The temperature sensor KTY10 has good linear relationship between temperature - resistance, and you can connect point A and point B (Measurement display circuit) with 100m wire, the digital display range is -50? to...
The electronic thermometer circuit diagram for blind
Measuring range: room temperature is -10 ~ 40 ?; body temperature is 36 ~ 41 ?; Resolution: room temperature is 0.5 ?, body temperature is 0.05 ?; error: room temperature <1 ?, body temperature <0.1 ?. When S1 is in position 1, it shows the room temperature profile; position 2 is the body temperature profile. V1, R1, R2, RP1, RP2 form the...
Thermistor electronic thermometer circuit diagram
The thermistor RT and R1, R2, R3 and RP1 form a temperature measurement bridge. When temperature is at 20 ?, using R1, R3 and adjusting RP1 can allow bridge to keep balance. When temperature rises, the resistance of the thermistor RT reduces, the bridge in an unbalanced state, the imbalanced voltage output by bridge is amplified by operational...
The electric thermometer circuit composed of LM134
This is the electric thermometer circuit composed of LM134. In the circuit, the voltage or current output by LM134 is in proportion to the thermodynamics temperature, which can be read out on the 100?A meter, the test temperature range of the meter is -55?150?. The power supply can work even when the voltage is under 1V, but when the precision...
The thermometer circuit composed of LX5600
When this thermometer is used in the room, it can work in the intermittent way, and this working state can be kept in the temperature test circuit, because internal temperature doesn`t change sharply. The astable multi-resonance oscillator consists of VT1 and VT2, i.e the interval oscillator circuit, which samples per 1s, and the interval time...
The temperature measuring range of this electronic thermometer is 0-50?, the precision is 0.1?, the measurement results are intuitively displayed by digital display. This electronic thermometer circuit is composed of temperature detection circuit, monostable circuit, digital display drive circuit and power supply circu..
ICL7106 constitutes a micropower thermometer
LM135/235/335 Centigrade Thermometer
LM135/235/335 temperature sensor is designed ease absolute temperature reading, giving all positive value for any frequency, that`s why we read 2.7315V at 0..
Resistance Thermometer Current Loop Transmitter
Resistance temperature sensor (RTD, resistive temperature device) comes in NTC (negative temperature coefficient) and PTC (positive temperature coefficient)..
digital thermometer circuit
Digital centigrade thermometer
This circuit shows an ICL7106 connected with a silicon transistor to form a digital thermometer. Direct connections between the ICL7106 and an LCD display are shown in Fig. 12-11B. A diode-connected silicon transistor has a temperature coefficient of about -2 mV/ƒ. To achieve calibration, place the sensing transistor in ice water and adjust the
Linearized platinum resistance thermometer
With the values shown, this circuit has a ±0. 025 °C accuracy over 0 ° to 100 °C. The input offset voltage of the LT-1001, and its drift with temperature, are permanently trimmed at wafer test to a low level. However, if further adjustment of VOS is necessary, nulling with the circuit of Fig. 10-4B will not degrade drift with temperature. The Fig.
The output of this circuit is a current proportional to temperature, which can be used to drive a meter for a direct readout. Alternatively, a resistor or op amp can be used to get a voltage output. The circuit is pulsed at a low duty cycle to reduce power consumption. With the component shown, the duty cycle is about 0. 2% with a one-se
This very simple circuit is an electronic thermometer using an inexpensive silicon transistor (2N2222) as the temperature sensor or probe. The circuit provides better than 1ƒ accuracy over a 100ƒ range. An LM113 diode regulates the input voltage to 1. 2 V. The 1. 2 / is applied through R2 to set the operating current of the temperatu
Frequency Meter Circuits
VU Meter Circuits
Ultrasonic distance finder circuit
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 measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
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 find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
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 circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
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 circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
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, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
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 calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
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 supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
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. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial