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This thermometer uses an NTC thermistor (RIO) to produce a dc voltage that decreases with temperature, to drive an I
Heater temperature controller
The circuit can control up to 6 kW of heating, with moderate gain, using a 25-amp triac (SC260D). Feedback is provided by the negative temperature co-efficient (NTC) thermistor, which is mounted adjacent to the environment being temperature controlled. The temperature set potentiometer is initially adjusted to the desired heating level. As the thermistor becomes heated by the load, its...
In the case where analog signals are being used as the logic control, hysteresis from a Schmitt-trigger input can be used to prevent haH-wave power output. The circuit operation is as follows: at low input voltages, Q1 is biased in the off state. Q2 conducts and biases Q3, and the IRED turns off. When the base of Q1 reaches the biasing voltage of 0.6 V, plus the drop across Rv. Q1 turns on....
Universal Video Interface Circuit
This combination sync stripper and universal video interface can solve a lot of problems for you, including Super-Nintcndo-to-anything interfacing, video overlay and scope TV frame locking. Kits, fully tested units, and custom cable assemblies are available tlirough Redmond Cable.
TV Video Circuits
Over-Temperature Alarm Circuit Uses Common Inexpensive Components
Over-Temperature Alarm Circuit Uses Common, Inexpensive Components | Negative-temperature-coefficient (NTC) thermistor, ICs.
Temperature to Voltage Converter Circuit
With this simple temperature to voltage converter circuit we can do a precise measurement of the temperature in a room. A NTC resistor or a thermistor is u..
Resistance Thermometer Current Loop Transmitter
Resistance temperature sensor (RTD, resistive temperature device) comes in NTC (negative temperature coefficient) and PTC (positive temperature coefficient)..
40W 4 channel audio amplifier
With the integrated audio TDA8571J designed for automotive applications, this circuit can expand the sound of the car radio or connect a portable MP3 playerin it. Internally, thechiphas eightoperationalamplifierseton the bridge, allowingeachspeaker terminalbeing energized. Dontconnect thenegative terminal ofthe mass ofthe speaker, becausetheywillproducea short circ
Solar Panel Testing Shunt Schematic
Can a homebrew FET circuit replace a NTC
Design cicuit using a power mosfet to replace the NTC (thermister) that many Mag623 users employ to prevent their bulbs from flashing. Although inexpensive and easy to hook up, NTC`s run quite hot. They are also affected by ambient temperature, require a cool down period and generally have a tolerance +/-20%. I was hoping a simple FET circuit would be a practical solution.
The Sentient City Survival Kit is a project of Creative Capital. It is sponsored by the New York State Council on the Arts (NYSCA) and the Office of the Vice President for Research at the University at Buffalo. Additional support provided by the Network Architecture Laboratory @ Columbia University`s Graduate School of Architecture, Planning and
QAMI5516 SINGLE MODULE DEMODULATOR AND DECODER IC FOR DIGITAL VIDEO SET-TOP BOXES QAMi5516
500 Series immersion temperature probe, NTC, 100, 000 Ohm, ±1, 5 °C [2. 7 °F] tolerance, 10 °C to 260 °C [50 °F to 500 °F] accuracy, stainless steel, bullet housing, flying leads (two), 26 gauge Teflon insulation, 4, 267 mm [168 in]
AD8280 safety monitor circuit for Lithium Ion battery
The AD8280 manufactured by the Analog Devices is a hardware-only safety monitor for Lithium Ion battery stacks. The AD8280 has inputs to monitor up to six battery cells and two temperature sensors (either NTC or PTC thermistors). The part is designed to be daisy chained with additional AD8280`s to monitor a stack of significantly more than six bat
Cat Repeller CircuitRepellentCircuit555 Ultrasonic Circuit
With this cool cat/dog repeller circuit you could chase the cats off from any where you want. In fact, I designed this circuit to chase my cat from my computer table. Most of the animals like cats respond violently to ultrasonic sound and in fact it`s the best way to chase them off. This principle is employed in this circuit. The circuit here is n
simple hot water level indicator using ntc
fan control circuit using ntc and tl082
R1 15k ohm resistor. NTC Thermistor- 10k ohm, sold at Radio Shack in the states. P1 10k ohm potentiometer - sets the low speed(voltage) of the fans at the cool temperature. P2 50K ohm potentiometer - sets the gain of the circuit - how fast the voltage will rise to full output when the temp is higher. TL082 a op-amp that I had handy, most any singl
Electronic Circuit Schematic Automatic Fun Controller using NTC TTC3A103 as Temperature Sensor
Temperature controlled fan regulator
This fan regulator circuit will automatically control the speed of your fan according to the temperature. Two thermistors (R1 and R2) are used to sense the temperature. The circuit works almost like the published here previously. Here the potentiometer is replaced by the thermistors. When the temperature is increasing the resistance of NTC thermis
4-20 mA current loop circuit
Continued from the previous post. The same priciple is true for the followings, temperature to current transmitter. In this case the input voltage is propotional to the measured temperature, not the rotation. Temperature input, full analog, 2 wire, 4-20 mA loop powered transmitter U3 is a low cost, NTC based, integrated temperature sensor. The next..
Digital Inputs Equivalent
midi to dmx arduino control shield
I hacked together a quick and dirty Arduino MIDI-to-DMX control for our robot band Science Fiction Children. It`s really simple! And here`s how I did it. I have two really cheap LED Par56 from Stairville (DMX controlled), a simple DMX-Dimmer pack and use Ableton Live for our sound setup. So all I want is to control the differentcolors and dimmer
Automatic fan controller uses the temperature
This circuit is an automatic fan controllers, sensors used to detect changes in temperature using a thermistor. In this circuit, if the hot temperatures, electrical resistance in a small NTC and the input voltage at the inverting (-) is greater than the input voltage at the non-inverting (+) to the IC LM741, LM741 so that the output voltage at low
Temperature limit Relay
This circuit, is basically a resistance ? sensing window switch, except that the ?resistor? takes the form of an NTC thermistor and the circuit thus responds to temperature. TH1 must have a resistance in the range 500ohm - 9Kohm. RV1 is used to set half ? supply volts on the RV1 ? TH1 junction at the ?mean? temperature.
Built-in battery charger, Li-Ion
Build-in charger for instruments powered by single lithium-ion or Li-Pol accumulator. If external power supply not conected to charger, current back from the accu charger is very small. New version improved temperature stability and Not Needed NTC thermistor. After a simple adjustment can be from initial engagement to launch a thermistor to compensate for temperature dependence. After...
Battery Charger Circuits
Digital Thermometer using
The most common appl icat ion for the NTC thermistor is temperature measurement. Accurate temperature measurement can easily be accomplished by interfacing a Wheatstone Bridge, 6K/30K ohm thermistor network and a digital voltmeter integrated circuit as illustrated in Figure 5. The IC consist of an analog to digital converter with built-in 3-1/2 digit LCD driver providing resolution of...
Heat sensor relay switch
The Thermistor, or NTC (Negative Temperature Coefficient) of 10K, is a standard type. Most types will work. The one in the diagram is a 10K model made by Fenwal (#197-103LAG-A01). The resistance lowers as the surrounding temperature increases which affects the output (pin 6) and energizes the small relay and Led1(optional, just cosmetic and can be left out). P1 is a regular Bourns trimmer...
PWM fan controller
Microchip Technology (www.microchip.com) offers a family of cooling-fan speed controllers that operate in PWM mode for use with brushless dc fans (Reference 1). To control fan speed using the PWM waveform`s duty cycle, you can use either an external NTC (negative-temperature-coefficient) thermistor or one of Microchip`s PIC microcontrollers and its SMBus serial-data bus. Figure 1 illustrates a...
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