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This is the project of Digital Fan Regulator Circuit diagram. The circuit presented here can be used to control the speed of  fans using induction motor. The speed control is nonlinear, i.e. in steps. The current step number is displayed on a 7-segment display. Speed can be varied over a wide range because the circuit can alter the voltage applied to the fan motor from 130V to 230V RMS in a maximum of seven steps.  The triac used in the final stage is fired at different angles to get different voltage outputs by applying short-dura-tion current pulses at its gate. For this pur-pose a UJT relax-ation oscillator is used that outputs sawtooth waveform. This waveform is coupled to the gate of the triac through an optocoupler (MOC3011) that has a triac driver output stage.  Pedestal voltage control is used for varying the firing angle of the triac. The power supply for the relaxation oscillator is derived from the rectified mains via 10-kilo-ohm, 10W series dropping/limit-ing...

We can make an enhancement to DAC drive fan controllers with the use of an external amplifier that closes the loop around the tachometer. Essentially linear control over the full range of 8 bit DAC codes from 0 to 255 is provided by this enhancement. This only requires a little signal conditioning and a suitable amplifier arrangement since the tachometer is already there. Figure a shows us that the tachometer pulses are conditioned such that all pulse width information is removed (differentiated) and only pulse rate information remains. Fan speed or frequency is represented by this pulses. Than, this pulse is used as the feedback to an integrating motor control amplifier. To provide pulses just shorter than the duration of the shortest tachometer pulse at full fan speed, the time constant of the differentiator is initially set. Usually, this will provide a very little gain. We can increase the gain by decreasing the value of either R2 or C1. We have to set the gain so the fan just achi...

Hi friends! To day i share with you Best 3 Types of Ceiling Fan Circuit Diagram choose any circuit and enjoy this. 1 Type of Ceiling Fan Circuit Diagram Black speed switch, three wire capacitor.   Notes: Speed Switch connection table: 0 (OFF) : NC 1 (Fast): 1 to L and C1-1 2 (Med) : 1 to L and C1-2 3 (Slow): 1 to L , C1-1, and C1-2 2nd Type of Ceiling Fan Circuit Diagram Black speed switch with only three terminals connected, two wire capacitor. Notes: Speed Switch connection table: 0 (OFF) : No connection 1 (Fast): 2 to 1 2 (Med) : 2 to 1 and 3 3 (Slow): 2 to 3 Do not use an electronic speed control on this type of fan (I haven't tried, the documentation on my fan of this type just says not to).    3rd Type of Ceiling Fan Circuit Diagram Red speed switch, two wire capacitor. Notes: Speed Switch connection table: 0 (OFF) : No connection 1 (Fast): L to 1 2 (Med) : L to 2 3 (Slow): L to 3 Reversing switch truth table (all types described here, yellow switches) 1 (Forward):...

Basic circuit of the LM35 are made to control the fan is either used on amplifier that requires automatic cooling. Its use on power amplifier circuit above and only requires DC fan. From basic sensors based on ic and amplifier op-amp is added again to the transistor Q1 to drive the fan. Part List : R1___220K R2___100K R3___3K3 R4___22K R5___1M R6___150R R7___2K2 R8___33R 4W C1___100pF D1___1N4148 IC1__7915 IC2__TL072 IC3__LM35 F1___DC Fan 12V

This circuit lets you turn on/off a fan by just directing torchlight or other light toward its light-dependent resistor (LDR). The circuit is powered from a 5V power supply. Preset VR1 and a light-dependent resistor (LDR) work as the potential divider. Normally, the LDR’s resistance is high (20 kilo-ohms) in darkness and low (2 kilo-ohms) in light. This value of high and low resistances varies for other LDRs. Preset VR1 is used for setting the intensity of light, while preset VR2 is used for setting the output time period of IC1. Fan on/off Control by Light Circuit Diagram When light falls on the LDR, the monostable (IC1) triggers at pin 2, making its output at pin 3 from low to high. This low-to-high transition forms a clock for D flip-flop. The D flip-flop is operated in toggle mode by connecting its Q output to D point. The flip-flop output goes to an inverter (N1). The inverter output is fed to the relay driver transistor. When the inverter output is low, diode D1 conducts and the ...

DC fan control circuit for power amplifier .Variable speed DC fanThis series of works based on the input signal. Speed ​​/ fan rotation depending on size of the input signal coming from speaker lines. If there is no signal then the fan will spin slowly according to the setting VR1.Input supply can be taken directly from the main transformer power amplifier, 12V CT 12V, so no need to increase the transformer again. Circuit Schematic Electronics | CSE This circuit has been tested and do not cause buzzing.correction: the lowest R: 560 ohm

The circuit consists of power supply and control sections. The power supply section is built around transformer X1, bridge rectifier BR1 and filter capacitor C1. The 50Hz, 230V AC mains is stepped down by transformer X1 to deliver a secondary output of 9V, 300 mA. The transformer output is rectified by the bridge rectifier and filtered by capacitor C1. When the mains is switched on for the first time, pin 3 of IC CD4017 (IC1) goes high and relay RL1 energises to switch on the fan. When mains is briefly switched off using S1 and then switched on, the power to IC1 is maintained by the charge on capacitor C1. At the same time, there is a trigger pulse on the clock input (pin 14) of IC1, which advances the decade counter and relay RL2 energises to switch-on the air-conditioner. Both the air-conditioner and the fan will be turned off if the switch is in the ‘off’ position. Assemble the circuit on a general-purpose PCB and enclose in a suitable case. Fix the unit onto the switchboard. Use re...

Kawasaki ZRX1200 Radiator Fan Circuit Diagram To inspect and service the 2001 to 2006 Kawasaki ZRX1200 R/S radiator fan system, do the following: * Remove fuel tank. * Disconnect the 2 pin connector from radiator fan switch. * Using an auxiliary wire, connect the radiator fan switch leads of the main harness side. * Turn the ignition switch ON. If the fan rotates, inspect the fan switch. If the fan does not rotate, inspect: leads and connectors, main fuse, fan fuse, and fan motor. 1. Radiator Fan 2. Radiator Fan Switch 3. Junction Box 4. Fan Fuse 10A 5. Main Fuse 30A 6. Battery 12V14Ah

This circuit will turn on/off 12V DC fan or CPU fan when temperature above normal temperature.You can set turn on temperature by adjust VR1. This circuit use an NTC ( Negative temperature coefficient )which is a thermistor is one in which the zero-power resistance decreases with an increase in temperature. So If temperature increate the voltage at pin 3 on LM311 will decreated .The resistance of NTC is about 10K at 25'c. VR1 should be multi-turn potentiometer type such 10K/25 turn link

The controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap opamp as the amplifier. I designed this circuit to use 12V computer fans, as these are now very easy to get cheaply. These fans typically draw about 200mA when running, so a small power transistor will be fine as the switch. I used a BD140 (1A, 6.5W), but almost anything you have to hand will work just as well. Circuit diagram: Thermal Fan Controller Circuit Diagram Source: ESP

Many bathrooms are fitted with a fan to vent  excess humidity while someone is showering. This fan can be connected to the light  switch, but then it runs even if you only want  to brush your teeth. A better solution is to  equip the fan with a humidity sensor. A disadvantage of this approach is that by the time  the humidity sensor switches on the fan, the  room is already too humid. Consequently, we decided to build a circuit  that operates by sensing the temperature of  the hot water line to the shower. The fan runs  as soon as the water line becomes hot. It continues to run for a few minutes after the line  cools down, so that you have considerably  fewer problems with humidity in the bathroom without having the fan run for no reason. Naturally, this is only possible if you can  fit a temperature sensor somewhere on the  hot water line and the line does not become  warm if hot water is used somewhere else. We use ...