Loublet Schematic

Friday, October 31, 2014

Automatic Fan Controller Circuit Diagram

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 25c.

VR1 should be multi-turn potentiometer type such 10K/25 turn

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Wednesday, October 29, 2014

Automatic AC Power Switch Circuit Diagram

Holiday Home Electrical appliances accidentally left on in (holiday) homes left unoccupied for a short or a long period consume power unnecessarily and can present a ﬁre hazard. Everyone will be familiar with those nagging thoughts, a few miles down the road from the house: “Did I remember to switch off the coffee machine? The lights? The oven?”

Automatic AC Power Switch Circuit diagram :

Automatic AC Power Switch Circuit Diagram

Hotel rooms are often equipped with a switch near the main door which enables the power supply to everything in the room only when the plastic card (which might contain a chip or have a magnetic strip or a pattern of holes) that serves as the room key is inserted. The circuit idea given here to switch off lights and other appliances is along the same lines. The solution is surprisingly simple.

A reed contact is fitted to the frame of the main entrance door, and a matching magnet is attached to the door itself such that when the door is closed the reed contact is also closed. To enable power to the house, press S1 brieﬂy. Relay RE1 will pull in and complete the circuit for all the AC powered appliances in the house. The relay will be held in even after the button is released via the second relay contact and the reed contact (‘latching’ function).

As soon as the main entrance door is opened, the reed contact will also open. This in turn releases the latch circuit and consequently the relay drops out. The various connected appliances will thus automatically and inevitably be switched off as soon as the house is left. The circuit is principally designed for small holiday homes, where this mode of operation is particularly practical. Of course, for any circuit that deals in AC powerline voltages, we must mention the following caution.

Caution:

shock hazard! Construction and connection of this circuit should only be carried out by suitably-qualiﬁed personnel, and all applicable electrical safety regulations must be observed. In particular, it is essential to ensure that the relay chosen is appropriate for use at domestic AC grid volt-ages and is suitably rated to carry the required current.

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Saturday, October 4, 2014

Automatic Amplifiers Cooler Fan

The schematic of an Automatic Amplifiers Cooler Fan is given here. The circuit automatically turn on the cooler fan whenever the temperature of the heat sink exceeds a preset level. This circuit can save plenty of energy becausef the cooler fan are going to be OFF when the amplifier is running on low volume. At low volume less heat are going to be dissipated and itll not trigger the cooler fan ON.

The temperature is sensed using an NTC (negative temperature coefficient) thermistor R2. Junction of thermistor r2 and resistor R1 is connected to the inverting input (pin3) of IC1 that is wired as a comparator. The non-inverting input (pin2) is given with a reference voltage using the preset R3. As temperature will increase the resistance of NTC thermistor can drop and so do the voltage across it. When the voltage at the inverting input becomes but that of the reference voltage (set for a selected threshold temperature) the output of the comparator goes high and switches the transistor Q1 ON. this can activate the relay and the cooler fan are going to be switched ON. When the temperature decreases the reverse happens. LED D2 can glow when the fan is ON. Diode D1 could be a freewheeling diode.

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Friday, September 12, 2014

Basic Automatic Day Night Lamp with LDR

Automatic Day-Night Lamp wit LDR

Maybe its a lot who know how to work this one series, but I wanted to share back to the beginner on this. In the existing lighting circuit automatic lights that use components LDR (Light Dependence Resistor).

The workings of LDR LDR is exposed to light if the layer of the resistance was weakened likewise if there is no light at all resistance enlarged. here could make friends like that, because its components are a little easy but we will use the 220V AC voltage of course you must be very careful. Rather than actually being burnt. The author asks to be careful for the beginner course.

Schematic LDR

LDR components can be interconnected with a cable, so tools stay in the house but LDR is outside the home. It is recommended using qualified Relay no1 to avoid fire, because the relays are cheap to produce heat. Relay that cheap is not in use for high voltage. Travonya use the cheap, because this circuit does not require large currents. The function of Potensio 500KΩ to regulate Q1 & Q2 is on, if both the active transistor relay also participate actively.

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Wednesday, August 20, 2014

Efficient Automatic White LED Emergency Light Circuit

Referring the figure, we see that the schema is actually very easy to understand, let’s evaluate it with the following points:

The transformer, bridge and the capacitor forms a standard Power supply for the schema. The schema is basically made up of a single PNP transistor, which is used as a switch here.

We know that PNP devices are referenced to positive potentials and it acts like ground to them. So connecting a positive supply to the base of a PNP device would mean grounding of its base. Here, as long as mains power is ON, the positive from the supply reaches the base of the transistor, keeping it switched off. Therefore the voltage from the battery is not able to reach the LED bank, keeping it switched off.

In the meantime the battery is charged by the power supply voltage and it’s charged through the system of trickle charging.

However, as soon as the mains power disrupts, the positive at the base of the transistor disappears and it gets forward biased through the 10K resistor.

The transistor switches ON, instantly illuminating the LEDs.

Initially all the diodes are included in the voltage path, and are gradually bypassed one by one as the LED gets dimmer.

Parts List

R1 = 10K,

C1 = 100uF/25V,

D1, D2 = 1N4007,

D3---D6 = 1N5408,
T1 = BD140

Tr1 = 0-9V, 500mA,

LEDs = white, hi-efficiency, 5mm,

S1 = switch with three changeover contacts.

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Tuesday, August 12, 2014

New Automatic Shutoff Battery Charger Wiring diagram Schematic

This is a New Automatic Shutoff Battery Charger Circuit Diagram. This automatic shutoff battery charger schema diagram Adjust by setting the 500 ohm resistor while attached to a fully charged battery.

New Automatic Shutoff Battery Charger Circuit Diagram

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