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Engineering Reference Materials for Thermistor Schematic
  • What is a Thermistor?

    Thermistors What is a thermistor? A thermistor is a temperature-sensing element composed of sintered semiconductor material which exhibits a large change in resistance proportional to a small change in temperature. Thermistors usually have negative temperature coefficients which means

  • Thermistor Glossary

    thermistor will continuous withstand for an extended period without affecting its normal characteristics. MIL-T-23648: MIL-T-23648 is the US military's general specification for thermistors. Minimum switching current (Is): The minimum switching current is the minimum amount of current, normally

  • NTC Thermistor Application Guide

    thermistors are the most sensitive of all temperature sensing elements they are popular in temperature control systems. By using a thermistor in a voltage comparator circuit basic on-off temperature control as well as over-temperature protection can be incorporated. Temperature compensation Many

  • NTC Thermistor with a Voltage Comparator

    How to interface a thermistor with a voltage comparator. Visio-NTC Interface with a Voltage Comparator.vsd Select resistor values to minimize current draw. Vout = V or ground. Use relay on Vout for high power leads. Indicator. b. Fan. +. v. ¼ LM339. Buzzer. -. b. out. b. v. Accessory

  • Temperature Measurement with a Thermistor (.pdf)

    Temperature measurement can be accomplished with a simple Wheatstone bridge as illustrated, or in any configuration where the voltage across or current through the thermistor can be measured. Basic_Temperature_Measurement_Using_NTC_Thermistors copy www.thermistor.com. Basic Temperature

  • Inductively Coupled Thermistor

    This application note describes a temperature sensor using a PICmicro (R) microcontroller. This temperature sensor is unique because it can work through non-ferromagnetic walls. Interfacing to a thermistor is normally a very straightforward task. Interfacing to a thermistor on the other side

Discussions about Thermistor Schematic
  • Re: What's this component?

    I found one site that has the symbol of an MOV and a Thermistor. http://www.angelfire.com/electronic2/rch/schematic.html Also why does this device have pin numbers polarity? Seems strange an MOV and a Thermistor do not have polarity!

  • Re: What's this component?

    Thanks for the reply Mike, I have to correct those who say these are MOV's, they are NOT, they are a polymer PTC thermistor. An MOV is a clamping device, it clamps the voltage if it exceeds a certain level. These devices are more of a current "clamp", as the current through them rises, they hea...

  • Re: Resistive Current Limiter

    Are you still using this basic schematic? Did you set up the shorting contactor like I suggested back in October? If so, the current limiting resistor need only be in the circuit between the 240V input and the top terminal of Variac #2, basically just to limit the inrush through the portion of wi...

  • Re: Inrush Current

    No schematic (but what a great tool that would be for this forum...). But it isn't that difficult. Wire up a timer to the line power so that it comes on immedaitely when power is applied and a NO contact closes to another larger contactor (35A) coil after 1 second; the magnetizing inrush will be shr...

  • Re: What's This Component?

    Hi Mikerho, On searching I found this similar drawing, is a thermistor, and another drawing this time with the short horizontal line at the bottom-left, is a Varistor. It would make sense to combine these as a surge protection perhaps only accepting current from the electronics to the...

  • Re: Motor Thermistor

    Mikerho, The schematic you posted is for a BLDC motor drive, not an AC VFD; different applications. The apparent thermistors shown in there are likely "Current Limiting" thermistors; a completely different application. In that case, they use the NTC versions because when the drive is first powere...

News about Thermistor Schematic
  • The keys to effective design collaboration

    The key to any electronic hardware or software project is collaborative teamwork on every aspect of the design from supply chain to schematic capture, board layout, and fabrication.

  • What Rate of Amps Can I Charge Deep Cycle Battery?

    This is a schematic of an idea I've had for re-organising my emergency power supply for brown outs. The solar array will only be connected to the battery during brown out. I have a 10amp MPPT controller which I know I could wire to the 2 x 120watt panels, but I believe that would restrict the charg

  • Junior / Graduate RF Engineer

    Junior / Graduate RF Engineer rn rnOur client, based in Leeds requires a Junior RF Design Engineer to join their team working on new wireless modules. rn rnThis is a superb opportunity for graduates with an interest and experience in RF electronics to advance within the wireless industry. The role is to design, simulate and develop new products and modules for wireless communication technologies. A strong knowledge of PA Design for LTE communications is desired. rn rnThe ideal candidates will have knowledge of: rnRF Design, PA Design, Receivers, Transmitters, RF PCB layout techniques, RF simulation tools, Schematic capture and RF Systems ...

  • Go Analog With A Resistance-Based Calculator

    Do simple calculations with your own math box. Ralph Smith The next time you need to crunch a couple of numbers, resist the urge to grab a digital calculator. Instead, round up some variable resistors, also known as potentiometers, and wire them into an analog mathematics rig. By twisting the potentiometers' knobs and measuring the resulting voltage or resistance with a digital multimeter, you can perform simple multiplication and addition without a microprocessor in sight. MATERIALS: Digital multimeter Three 1K-ohm linear potentiometers 10K-ohm linear potentiometer LM7810 voltage regulator 0.33?F electrolytic capacitor 0.1?F electrolytic capacitor SPST on/off toggle switch Four 25/32-by-15/32-inch knobs Red binding post Black binding post Banana-to-banana cables Two 9-volt batteries Two 9-volt-battery holders 5.5-by-8.66-inch project box Roll of 22-gauge hookup wire TOOLS: Wire cutters Soldering iron Screwdriver Power drill 5/16-inch drill bit Your handy math box schematic. David Prochnow INSTRUCTIONS: Follow our schematic diagram for building a 10-volt power supply from the 7810 voltage regulator. Wire the two 9-volt-battery holders together in series by soldering a black wire from one holder to the other holder's red wire. Drill holes for the potentiometers and binding posts; you can use our schematic diagram's drilling template as a guide. Solder the remaining red wire from the joined battery holders to the red (+) binding post on the switch. Solder the remaining black wire to the black (-) binding post on the switch. Solder two 1K-ohm linear potentiometers in series to create a circuit that will help you perform simple addition. Solder one 1K-ohm linear potentiometer and the 10K-ohm linear potentiometer together as voltage dividers to make a multiplication circuit. Wire the power supply to the voltage-divider potentiometers according to our schematic diagram. Use the binding posts for collecting the black (-) and red (+) wires together. Join the series potentiometers and the voltage-divider potentiometers to the respective multimeter inputs. The voltage dividers, used for multiplication, will connect to the multimeter via the binding posts and the banana-to-banana cables. The series potentiometers, used for addition, are soldered to the multimeter's two probes. Prepare the probes by snipping them off and soldering each remaining wire to one end of the potentiometer series. Place the potentiometers and power supply inside the project box. Secure the knobs to each of the potentiometer's shafts. Mark the range of each addition circuit's knobs from 1 through 10 in a clockwise direction. Next, mark the range of the multiplication circuit's knobs from 1 through 0 in a clockwise direction. (See the photo above for guidance.) Switch the multimeter's ohmmeter to 2,000 ohms for addition, and calculate sums using the series potentiometers' knobs. For multiplication, use the multimeter's voltmeter (set to 20 DC volts) and measure the product of the voltage-divider potentiometers' knobs. OPERATION: Two modes are used on the multimeter. The ohmmeter displays the series potentiometers' sums, and the voltmeter displays the voltage-divider potentiometers' products. Addition: Set up the multimeter for addition calculations by connecting the red probe wire to the V?mA (+) input and the black probe wire to the COM (-) input on the multimeter. Turn on the multimeter and set its selector dial to its ohmmeter function with a setting range of 2,000 ohms. Rotate each knob on the addition potentiometers, and watch the sum on the multimeter display. Multiplication: Set up the multimeter for multiplication by connecting the red banana-to-banana cable to the V?mA (+) input and the black banana-to-banana cable to the COM (-) input on the multimeter. Plug the other end of each cable into the matching-color binding post. Turn on the multimeter, move its selector dial to the voltmeter function, and set the range to 20 volts. Turn on the SPST switch. (Note: This switch sends 10 volts of DC power through the voltage-divider potentiometers.) Turn each multiplication potentiometer and see the product on the multimeter display. Notes: There are two noteworthy features about the multiplication function of the analog calculator: The products are decimal fractions. This is because the potentiometers act as voltage dividers. For example, the first potentiometer divides the reference voltage (i.e., 10 volts DC) in half, which is equivalent to multiplying the reference voltage by 0.5. Similarly, the second potentiometer multiplies the first product by 0.5. Therefore, if each potentiometer is placed at its halfway point, the multimeter will display a product of 2.50, or ((10 * 0.5) * 0.5) = 2.50. The second feature of the analog calculator's multiplication function is the presence of an obvious calculator error. Can you spot it? As the two 9-volt batteries begin to lose power, the resulting products will be lower than you would expect to see. For example, with both potentiometers set to 1, the anticipated multimeter display would be 10 volts. As the batteries age, however, the multimeter might display 9.55 volts with both potentiometers set to 1. Therefore, our calculation would be: ((9.55 * .5) * .5) = 2.39. This article originally appeared in the August 2014 issue of?Popular Science.

  • New CadSoft EAGLE update brings an enhanced design environment, increased flexibility and cost savings for customers

    CHICAGO – PCB design solution vendor CadSoft Computer, a Premier Farnell company, has today launched Version 7 of its award winning EAGLE PCB software. The update to the popular software brings a modern design environment with increased flexibility, enabling users to develop custom schematics using commercial standard software at a fraction of the cost. New features include an enhanced autorouter with significantly less transition points, resulting in more cost-effective and efficiently routed PCBs that require fewer manual interactions. The new autorouter also enhances productivity and performance by utilizing multi-core machines, running each routing variant on its own processor simultaneously. Users will benefit by having multiple configurations of the same routed board to choose from, and can use it to select the best outcome for his design. Version 7 supports larger design teams and more complex designs by enabling large schematic designs to be organized into small functional blocks, which can be assigned to different team members and then easily integrated when complete. This type of hierarchical methodology has significant advantages, giving large organizations a “global view” of the functional blocks of the project to make it easier to locate and change aspects of the schematic or layout. Enhanced license management features have also been introduced to protect customers’ software investment, while enabling single-user licensors to install the software on up to two devices. For multi-user license owners it will be easier to manage the seats from a license server with better protection of the software. EAGLE Version 7 also provides a new ULP to export IDF files. A basic model with placeholders for the 3D models of all components can be exported, to be used for preliminary checking. A comprehensive 3D model can be created with Simplified Solution’s “IDF-to-3D” tool which will be available in the CadSoft web shop later this summer. “CadSoft EAGLE v7 offers greater flexibility than ever before for design teams, with new capabilities that extend the software to more complex design within larger organizations,” said, Thomas Liratsch, Managing Director at CadSoft. “This means we can support more customers through each step of the design process, providing the tools that enable engineers to pull the raw components of any electronics system together, whether they are starting out in the industry or are experienced board-makers.” The latest version of EAGLE is now available to download here. About CadSoft CadSoft Computer GmbH and CadSoft Inc. are part of Premier Farnell plc., one of the world’s leading distributors of electronic components, products and services. CadSoft specializes in the development of the popular CAD-Software EAGLE used by design engineers worldwide for over 25 years. EAGLE is a user-friendly, powerful and affordable software for efficient circuit board design (PCB design) and combines the modules schematic editor, layout editor and autorouter in a single interface. Shared Open Source User Language Programs (ULPs) guarantee maximum flexibility by enabling various features, such as simulation, realization of individual instruction sequences, data export and import. DesignLink feature provides access to data and prices on over 4 million products from Newark, Farnell and element 14. EAGLE users benefit from free support through dedicated experts, active customer forums, the EAGLE community on element 14, webinars and training on demand. EAGLE is available for Linux®, Mac® and Windows®. Its flexible licensing model includes free lifetime support and maintenance, which offers great value for educational institutions, companies and individuals. About Premier Farnell Premier Farnell plc (LSE:pfl) is a global leader in high service distribution of technology products and solutions for electronic system design, maintenance and repair. Its differentiated proposition includes 29 local language transactional websites, and the critically important element14 Community for design engineers – an industry first (www.element14.com). With sales last year of £952m the Group distributes its comprehensive portfolio of products and services throughout Europe, North America and Asia Pacific, supported by a global supply chain of over 3,500 suppliers and an inventory profile developed to anticipate and meet its customers’ needs. While global in scope, Premier Farnell recognizes the individual needs of each market and has continued to internationalize its model accordingly. It trades locally as Farnell in Europe, Newark/element14 in North America and Mexico and Farnell Newark in Brazil. Across Asia Pacific the business trades as element14.

Product Announcements for Thermistor Schematic
Status Instruments, Inc.
Thermistor Transmitter

PUSH BUTTON Calibration. Thermistor Sensor Input. In-Head Mounting. Temperature Linear Output. Small Spans 10 °F. Re-Rangeable Without A Computer. The SEM203TH Transmitter connects to a standard thermistor and produces a 4-20 mA signal that is linear with temperature. Two models are available. One accepts a 2252 ohm thermistor, the other a 10K ohm thermistor. The transmitter can be mounted in a junction box for attaching directly to the temperature sensor or for surface mounting to a wall...

Thermik Corporation
PTC Thermistors - Highest Quality

Thermik thermistors correspond to DIN 4408, DIN 44082 and IEC 34-11-2, and exhibit a very high temperature sensitivity. The resistance increases strongly in the area of the rated response temperature. This change can be used to switch off the load circuit through a triggering device. Electronic evaluations of many different applications are also possible. Advantages: Small dimensions. Fast response times. Mechanical stability. Temperature-resistance-characteristic-curves individually made...

Thermik Corporation
Thermistor Sensor -- LTM

Thermik thermistors correspond to DIN 4408, DIN 44082 and IEC 34-11-2, and exhibit a very high temperature sensitivity. The resistance increases strongly in the area of the rated response temperature. This change can be used to switch off the load circuit through a triggering device. Electronic evaluations of many different applications are also possible. The typical characteristics of Thermik thermistors are presented in the temperature resistance diagram. Advantages: Small dimensions. Fast...