Top Circuits Page 74

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 ?....

This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polarization regime. In fact when forward biased, the forward voltage drop accross a diode has a....

This circuit controls very accurately a fan of any size. Just adjust the associated resistors for a different type like the R6 resistor of 100 ohm, 2 watt type and you're all set. The above circuit diagram is for a small 12 volt fan, the size and type....

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....

A unified thermometric controller that can be programmed with simple scripts, integrating the "classic" thermometer/controller pair. You can build a variety of simple machines with the same hardware and a different script : a charting thermometer, a vending....

Here is a circuit that implements phase-control of heaters, adjusting their power smoothly from zero to around 95% of the rated power, keeping the room temperature to within 1 or 2 degrees, while using few components. Notice that this is entirely an AC....

This circuit uses a germanium diode (marked Ge) as a temperature sensor. I used an OA90 diode but others should do. The 'ring' of Tr1 and Tr2 bias each other. Tr1's collector current is stabilized by the 5v6 zener, causing Tr2 to operate at about 5mA: this....

This circuit greatly expands upon the capabilities of circuit 02. A thermocouple signal is quite small, and the long thermocouple leads often induce quite a bit of noise into the system. This new circuit is far more accurate, stable, and less immune to....

Continuing with the thermocouple interface concept, the next step is to amplify the TC's millivolt signal into a more readable analog voltage, on the order of 0 to 5VDC. This simple circuit fits the bill. The LM358N is a dual op-amp IC. I'm quite sure any....

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....

A device designed for measuring time and temperature used in chemistry laboratory. The circuit employs a 89C4051, 20-pin CMOS Microcontroller with built-in 4kB code memory. Temperature was measured by LM35D, National Semiconductor Temperature sensor....

Vegetable greenhouse temperature detection control circuit Greenhouses temperature detection control circuit, it is mainly by the ..

As shown in Figure by the built-in temperature sensor to control the triac TC620 achieve temperature control. Adjustment circuit Rp1 and Rn ..

FGDF-3 three-phase low-temperature iron plating main circuit KGDF-3 low-temperature iron plating power supply device having a single-phase low-temperature iron plating all the ..

Electronic thermometers as shown in the circuit. RT is the thermistor, A is an integrated operational amplifier. VD1 ~ VD4 composition marked by the scribe mushroom flow channe..

Electronic temperature control circuit on an imported car air conditioners. Operational amplifier Ai, A2 using LM393. Adjustment potentiometer RP. Temperature range can be chan..

Electronic switch selection, you can achieve multiple temperature control, or a plurality of temperature monitoring points, monitoring. OP27 multiple S-type thermocouple circui..

As shown in Figure by the built-in temperature sensor to control the triac TC620 achieve .png">temperature control ...

Eggs hatch chicks temperature requirements within 36 ~ 39oC temperature range, temperature sensor integrated circuits using TC621 temperature control circuit, having fewer exte..

Dispenser (Aucma) temperature detection control circuit It shows the dispenser (Aucma) temperature detection control circuit. The dispenser is composed of two parts, one part i..

T-121 temperature sensor electronic thermometer circuit diagram shown below..

Circuit from the MAX1494 and thermocouple temperature measurement system as shown, MAX1494 termination of 1N GND 5-32. The use of an external temperature sensor (for example, DS75) and SCM can be done carry junction temperature compensation work. MAX1494....

OP07 low drift (maximum voltage drift 30 FLV, maximum drift 0.6vV / aC), low noise (maximum 0.6 pLVp.P), ..

Electric thermos temperature detection control circuit Electric thermos shows the temperature detection control circuit. It is mainly by the control circuit of the boiler heate..

Consisting of two differential amplifier transistors voltage dividing type bias circuit, and this resistance is measured four bridge four of arm. Wherein the product is a plati..

The circuit needs 15 volts and uses a precision op amp CA3193 BiMOS to amplify the signal generated more than 500 times. Three 22-megohm resistors provide large-scale output if the thermocouple opens. ..

In order to prevent electric contact pressure thermometer contacts singeing failure, the best way is to work to improve the contacts, as shown in Fig. 11-60...

Adjustment potentiometer RP, can change the TRIAC V conduction angle, to achieve tempering purposes...

Use fluorescent starter bimetal can be prepared as a temperature sensing element, as the thermostatic control. Double metal sheet for temperature sensing element, the circuit is simple, easy to..

With a three-wire serial interface smart temperature sensors DS1620 and SPI bus interface circuit as shown below: ..

Thermostat electric circuit as shown in FIG. It points to off (off), Lo (low power), Peru HL (high power) third gear. When DIP switch SA to Lo gear, 220V electricity through the diode VD4, VD56 added to the load RL ends; half-wave rectified by a diode so....

AD587 precision voltage reference 10. OOV generated by 27kfl resistor added compensation diode IN4148 and the thermocouple, and to VI + N terminal of the differential amplifier provides a fixed operating point. Thermocouple output voltage to the differential ..

8 NC temperature adjusting circuit shown, which is mainly composed of D/A converter, a reference power supply, amplification, temperature sensors and other components. This cir..

8-channel temperature shown detection circuit, it can be 8 temperature detection.. {D581 is 10. OOV precision reference voltage source, to the detection circuit provides precis..

80kW resistance to salt bath furnace controlled circuit. Salt bath resistance furnace is a big power device, the circuit using fast start, temperature-controlled technology, ca..

A AD590 or AD592 can easily in a transmission line temperature data transmission. The circuit generates a value 1mV/(or is 1mV/F using the values in brackets). ..

A company is given to ATMET 89C51 microcontroller core temperature intelligent monitor, monitor with automatic temperature recording a three-phase power before phase, a record ..

A diode IN4148 temperature circuit is shown. The circuit temperature range - 25-125, accuracy of soil 0.5. Core elements of the operational amplifier circuit is four LMC660, it..

A temperature sensor such as the use of ordinary silicon diode, about one obtained 2.2mV ,/variation of Oc. OP amplifier AL with the positive reference temperature (room ju) un..

AD170 basic electrical parameters are as follows: temperature coefficient of 25ppm/C, temperature measurement accuracy of l, the maximum temperature in the range of a 200 ~ + I..

AD524J type thermocouple cold junction temperature compensation circuit shown in Figure 1-20. The circuit is detected by a J-type thermocouples, the base reference voltage sour..

AD594/595 can also be configured to Celsius, the circuit shown in FIG. This time should be IN +, IN- terminal and COM shorted, the output voltage Uo temperature coefficient of ..

AMP - 04 is a single-supply, single resistor gain adjustment, the input voltage drift of less than 150 pLV, the current drift in 5nA, temperature drift of 8 pA/aC, gain nonline..

Adjust RP1, RP2 can be preset temperature control point, 555 circuit Schmitt inverter circuit with relay device automatically. T-121 temperature control circuit constituting th..

Adjustable thermostat controller circuit is very long use in everyday life, such as constant temperature soldering iron, as shown in FIG. TMP17 by the REF01E to provide a high ..

As shown by a diode temperature sensor 3-digit thermometer, 3 digits the A/D converter and display driver lC L7106/7107 to amplify the signal, A/D conversion, and a series of d..

As shown by simple smart temperature sensors based on I2C bus interface configured as shown thermostat controller circuit. LM75 through 2N3904 transistor to drive the relay coi..

As shown for the basic application circuit thermistor. Figure (a) of the basic temperature measurement circuit. The circuit temperature measurement accuracy is not high, can on..

As shown in FIG constituted by ISO102 and INA101 have to eliminate ground loops, and high-end off cold junction compensation thermocouple amplifier. This circuit uses the K-typ..

As shown in FIG grounds ISO102 and XTR101, op amp, isolated remote transmitter circuit having isolated thermocouple cold-junction compensation constituted power. The circuit co..

As shown in FIG grounds with three-wire serial interface smart temperature sensors DS1620 small electric heater temperature control circuit. When ..

As shown in Fig having two temperature zones and thermocouple cold-junction compensation diode input circuit. This circuit uses the J-type thermocouple as a temperature sensor,..

As shown, a diode as a temperature sensor application circuit. Circuits, silicon diodes VD1 and VD2 as a temperature sensor, a temperature coefficient of silicon diode ZmV/. A1..

As shown, the OPA277 constitute inverting amplifier, inverting amplifier use high input impedance characteristics can be reduced and the loop thermocouple offset drift. 50 pote..

As shown, the circuit uses type J RTD, its resistance value corresponds to the temperature of the RTD can check a form provided by the manufacturer, with 20 zero adjustment pot..

As shown, the digital thermometer by the temperature sensor, single stabilizing circuit, counter circuit, decoding, driving and LED digital tube and other components. Temperatu..

Automatic Humidifier can be used to control humidity control family, it can also be used hatchery poultry farms or juvenile poultry house climate control. When the humidity is ..

Automatic temperature control circuit shown in Figure 1-7, for climate control thermostat. (1) control purposes and methods of control objects: electric heater EH. Control purp..

Can set the thermostat, the thermostat lower limit of the circuit diagram: Apparatus circuit src /d/file/200903/cec7c13418f35640e242ae37ad02292f.jpg width 600 border 0 ..

Channel 7 has a circuit diagram of a smart temperature sensor MAX6698 is shown in Figure: MAX6698 maximum temperature with three transistors (VT1 ~ VT3) and three thermistors (..

Circuit from the AD596/597 form a temperature measurement and control instrument is shown in Fig. Here, AD596/597 (IC1) as a closed-loop thermocouple signal conditioner use. IC..

Circuit of the easy to use cedar LM3sDZ temperature detection heir. Does not show adjusted to obtain 1 (hnV/aC output temperature change range if he is 0 ~ so * c, -. The outpu..

Circuit shown in Figure: MAX6698 maximum temperature with three transistors (VT1 ~ VT3) and three thermistors (RT1 ~ RT3). The internal reference voltage source via a resistor ..

TOP100Y constituted by a + 5v, 1A output flyback DC switching power supply circuit is shown. This flyback..

35W switching power supply circuit having a set-top box output is shown in Figure 5. The five-way voltage respectively: Uo1 (+ 30V, 100mA), Uo2 (+ 18V, 550mA), Uo3 (+ 5V, 2.5A)..

Is another kind of connection switch incandescent spider life extension, it has two functions: First, just by electroporation,..

Uses the MAX641 switching controller and an external discrete charge pump to step up the input voltage. This circuit can service low loads and is efficient when the output is two, three, four times the input voltage. Adding the MAX627 MOS driver can further....

EMI from offline switching power supplies typically causes all sorts of problems for power-supply designers. You may need a large EMI filter to meet FCC emission requirements. Switchers for high efficiency produce high-frequency switching noise that can....

The system makes use of the A/D to read the input and output voltages, the Capture/Compare/Pulse module to generate a PWM output, and Timer2 to regulate how fast the program runs. External hardware includes a switching power converter and a suitable....

A 4V-60V to 5V DC/DC converter is shown in Figure 2. This converter is well suited for 12V automotive battery applications, maintaining output voltage regulation with battery line voltages from 4V cold crank through 60V load dump. The threshold for....

The core voltages for FPGAs are moving lower as a result of advances in the fabrication process. The newest FPGA family from Altera, the Stratix® II, now requires a core voltage of 1.2V and the Stratix, Stratix GX, HardCopy® Stratix and CycloneTM....

This application note describes a complete flyback switched mode power supply that uses a Fairchild Power Switch. The MOSFET and its control IC are built into one package. The MOSFET is in fact a SenseFET. Various protection features are also included.....

I built a PCB for a simple switching power supply, originally designed by Keith Payea of the SRS. It uses an LM393, a P-channel power MOSFET, and darn little else. Since its frequency varies based on load (and nearly everything else imaginable), you can use....

The switching power supply, shown in the schematic, provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit. The supply was constructed in 1984 and is variable....

Power supplies that operate at a fixed frequency have their largest EMI emission at this fundamental, fixed frequency. Emissions also occur at multiples of the switching frequency but at diminished amplitudes. The simple circuit in Figure 1 makes the....

Figure 1 shows the LT®3439, one of several low noise switchers available from Linear Technology. Ultralow noise and low EMI are achieved by controlling both the output switch voltage and current slew rates. This switching architecture is particularly....

In Figure 1 , a basic and versatile 5V supply uses a zener diode and an emitter-follower transistor. You must calculate and design the transformer such that Q1 is close to saturation at low mains voltages and nominal output current. Additionally, you must....

Start-up is a stressful time for the power driver section of a switching power supply. Because the output voltage is initially zero, the feedback error initially jumps to its maximum. The large feedback error then drives the loop filter to its limit,....

Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply....

This Design Note describes how to generate five separate output voltages using the LTC®1538-AUX, a dual synchronous switching regulator controller with internal circuitry adaptable to many additional configurations...

Many applications require current sources rather than voltage sources. When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor. To solve the wasted-power problem, you can use....

12V voltage instability, you should first check the switching power supply output section, as shown in FIG. The secondary winding of the..

One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its output voltage is variable. This is achieved by connecting a potentiometer between common terminal of....

This page provides basic information about voltage comparator integrated circuits and is to act as reference material for other circuits. The circuits shown are based on the LM339 Quad Voltage Comparator chip or the LM393 Dual Voltage Comparator chip. These....

If you`re an effects builder or repairer, you know by now that it`s a good idea to protect the circuitry in the effect from the consequences of a reversed battery. While many older effects can withstand a momentary reversal, some more modern components can....

Coship CDVB3188V receiver switching power supply circuit It shows the same continent CDVB3188C receiver switching power supply circuit, mainly from the AC input circuit, anti-j..

Described here is a specific module using CF8865 switching power supply circuit, because this circuit is the use of integrated control module CF8865 specific modules. In the fi..

The object is to get the cell voltage high enough for the sulphate to dissolve without boiling or melting the battery. This is achieved by applying higher voltage for shorter periods and let the battery rest for a while. The pulses on short range is about....

This paper gives a practical example of the design of an off-line switching power supply. Factors governing the choice of a discontinuous flyback topology are discussed. The design uses a pulsed-width modulation (PWM) control scheme implemented....

The present trend is to use ever higher frequencies. But by doing so it becomes more difficult to filter out the RF noise inevitably generated by the switching. So I decided to stay at a low switching frequency of only 25 kHz for the full cycle, which due to....

This PWM control circuit provides the control pulse to the DMOS Power Switch in the flyback circuit. The output of the PWM is a pulse whose width is proportional to the input control voltage and whose repetition rate is determined by an external clock....

Circuit is shown. C1 is the input filter capacitor. VDz VD1 composition and primary clamp .png">protection circuit . The control ..

Figure (a) shows a block diagram of the internal structure of the M62213FP. M62213FP is a high speed switching power supply controller. It consists of an oscillator, PWM compar..

Constituted by a 5V TOP414G, 2A output isolated switching power supply circuit is shown. C1 is the input filter capacitor. VDz VD1 composition and primary clamp protection circ..

Driver circuit diagram: The main function of the driving circuit is variable width pulse width controller output power amplifier, as a drive signal to high voltage power switch..

Dragon -ZL-2801A DVD machine type switching power supply circuit It shows Dragon ZL-2801A type DVD machine switching power supply circuit, which is mainly from the AC input cir..

East Shi IDS-2000F STB switching power supply circuit East Shi IDS -2000F STB switching power supply circuit mainly by the AC input circuit, switching oscillation circuit, outp..

Electrical equipment supplied to a power supply circuit design power section, as shown below: ..

Constituted by a 15V TOP224Y, 2A output DC switching power supply circuit shown in FIG. Using three integrated circuits: ICl is a monolithic regulator TOP224Y, IC2 is optocoupl..

As shown in the Sony KV-S29MHl (S movement series) TV switching power supply (SIR a 80145A) circuit; (A) is the power oscillation part; (b) is the regulator part; (c) is the output section...