Fan Control Circuit

LM56 is a monolithic thermostat designed for simple temperature control. The chip has two programmable threshold that can be used to drive a fan and or alarm. Here is the schematic diagram of the fan control circuit: The circuit will turn on the fan when the temperature rise above 50 Celsius degree, and this threshold is set by the voltage at VT1. When the temperature rise above 70 Celsius degree then the OUT2 will go high. This signal then can be used to trigger system shutdown or just to turn on a warning LED. This threshold is set by voltage at VT2. [Schematic diagram source: National Semiconductor's Temperature Sensor Handbo...

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voltage regulator

The following circuit is designed for filtering 15 volt supplies like those typically found in instrumentation. The shunt will greatly reduce white noise, spurious signals, and line-related signals on the power supply; the attenuation can exceed 40 dB with careful construction. The values are not critical except that the gain of the amplifier should be very near the ratio of the transistor emitter resistor to the series shunt resistor. In this case the gain is 15/0.05 = 300. Actually the gain is 301 with the indicated values so a 299k resistor would be theoretically better but the resistor tolerances and the actual resistance in the 0.05 ohm...

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convert: 6vdc to12vdc

If you are in tour, camping, picnic it is helpful for you. you can conver 6VDC to 12VDC.Here is the circuit diagram of 6VDC to 12VDC Converter. With this circuit, you can doubled the input voltage of 6V DC to become 12V DC output voltage. Parts: R1, R4 = 2.2K R2, R3 = 4.7K R5 = 1K R6 = 1.5K R7 = 33K R8 = 10K C1,C2 = 0.1uF C3 = 470uF/25V D1 = 1N914 D2 = 1N4004 D3 = 12V 400mW Zener Diode Q1, Q2, Q4 = BC547 Q3 = BD...

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MAD BAND

The Mad Band - Brief Band Description andBiographies MAD BAND MAD BAND The content in this page is deleted...

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circuit diagram:12dc to 220ac converter

You want to convert 12vdc to 220vac, 300w. Then this schematic diagram will helps you. It can be used for home appliances, lamps, electric radio, mobile charger etc. Part Total Qty.Description C1, C22 = 68 uf, 25 V Tantalum Capacitor R1, R22 =10 Ohm, 5 Watt Resistor R3, R42 =180 Ohm, 1 Watt Resistor D1, D22 =HEP 154 Silicon Diode Q1, Q22 =2N3055 NPN Transistor (see "Notes") T11 =24V, Center Tapped Transformer (see "Notes") MISC1 =Wire, Case, Receptical (For Outp...

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loadshedding routine of electricity: Nepal

Nepal Electricity Authority has hiked load-shedding 10 hours a day.Download latest loadshedding Schedule Effective from 2068/01/25 . "Use CFL and save Electricity" To download Click here... ...

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B.E Preparation

SOME PRACTICE MODEL QUESTIONS Sub:Physics F.M.:100 Time: 2hr Useful physical constants and symbols: Speed of light, C=3*108m/s Permittivity of vacuum=8.86*10-12F/m Planks constant, h=6.6*10-34JS Charge of an electron, e=1.6*10-19C Mass of an electron, m=9.1*10-31kg Mass of proton, M=1.67*10-27kg Density of water, p=1000kg/m3 Density of sea water, d=1030kg/m3 Gravitational Constant, G=6.67*10-11Nm2/kg2 Stefan’s constant, =5.685*10-8Wm-2K-4 GROUP-A Tick ( ) on the correct answer. 1. The dimensional formula for gravitational constant is a) M-2L3T-2 b) M-1L-3T 2 c) M-1L3T-2...

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Way to happiness

Happiness is not far away of you understand life and embrace it. To live life to the fullest and make it more positive you just have to follow simple rules. Here are some simple rules of life that will help you to better you and better tomorrow. 1. LEARN TO LISTEN Only the mind that listens can understand anything. Listen is not passive as most of us think. It means to let a message sink in, without being judgmental. Don’t comment. Let not your conditioning interfere with understand in what you are hearing. Put off your filters. Let your intelligence take break. Don’t validate us anything. Listen with a still, calm mind and you’ll hear the deeper meanings. You’ll understand the truth. 2. UNDERSTAND YOURSELF Go inward. Look inside you. Just relax and let your thoughts come out. Don’t...

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knowledge is power

"For also knowledge itself ispower" stated originally byFerdowsi, which in moderntimes is often paraphrased as"knowledge is power." Thephrase implies that withknowledge or education one'spotential or abilities in life willcertainly increase. Having andsharing knowledge is widelyrecognised as the basis forimproving one's reputation andinfluence, thus power. Thisphrase may also be used as ajustification for a reluctance toshare information when aperson believes thatwithholding knowledge candeliver to that person someform of advantage. It is possiblethat Bacon was paraphrasingProverbs 24:5: "A wise man hasgreat power, and a man ofknowledge increases strength."Another possible meaning forthis phrase can be found inphilosophical idealism - if theworld exists solely as thecontent of consciousness,...

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