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This simple water level sensor circuit monitors the presence of water in a certain location or container. The circuit sends an acoustic alarm when it senses a drop of water leak. It is very simple to build and it is made of a single IC and some passive components. Check out the water level indicator circuit too! The IC LM1801 is a low power comparator that can deliver high output current if needed. When water hits the sensor, the reference voltage is overshot and the IC drives the ceramic transducer to beep. It is also possible to connect several sensors to the water level monitor circuit. The sensor can be easibly made out of a small piece of PCB that is etched with the proper pattern. The decoupling capacitor C3 is a 100uF/16V electrolytic capacitor.  source [link] 

                                                    B1=AC BUZZER

Usually, Low-Cost Stereo Level Indicator home stereo power amplifiers don’t have output level indicators . An output power level indicator can be added to each channel of these stereo power amplifiers . As low levels of the output power are not disturbing and damaging to the people, there is no need to add a preamplifier and low-level detector before IC LM3915. But you should know when the output power becomes considerably high. Here we present a very simple, low-cost stereo-level indicator circuit for home power amplifiers with power rating of around 0.5W. The circuit is built around two LM3915 dot/bar display driver ICs (IC1 and IC2). LM3915 senses analogue voltage levels to drive ten LEDs, providing a logarithmic 3dB/step analogue display. Stereo Level Indicator Circuit Diagram The voltage levels below 1V are not important because these correspond to a low level of the audio signal. Similarly, input voltage levels above 30V correspond to too high levels of the output power, which ...

Here’s a SIMPLE WATER LEVEL INDICATOR CIRCUIT . It is best suited for overhead water tanks to display the amount of water. The circuit consisting of 3 LED’s used to indicate minimum, medium and maximum levels. It is possible to increase the count of indicator LED’s and make it more convenient. The circuit is powered by a 6V battery and it consumes only very less current. Read More.....

Project of Water Level Indicator Circuit Diagram.Simple, two-wire, remote monitoring unit, Three-LED level display, 9V battery powered. The whole project was developed on a friend's request. Its purpose was to remotely monitor the water-level in a metal tank located in the attic by means of a very simple control unit placed in the kitchen, some floors below. Mains requirements were: No separate supply for the remote circuit Main and remote units connected by a thin two-wire cable Simple LED display for the main unit Battery operation to avoid problems related to mains supply and water proximity As the circuit was battery operated a low current consumption was obviously welcomed The very small remote unit is placed near the tank and measures the water level in three ranges by means of two steel rods. Each range will cover one third of the tank capacity: Almost empty - signaled by means of a red LED (D3) in the control unit display About half-level - signaled by means of a yellow L...

LM3915 monolithic integrated circuit can be designed a very simple audio power level meter that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays, providing a logarithmic 3 dB/step analog display.One pin of the LM39145 changes the display from a bar graph to a moving dot display. LED current drive is regulated and programmable, eliminating the need for current limiting resistors. Audio Power Level Meter Circuit Using LM3915 The whole display system can operate from a single supply as low as 3V or as high as 25V.Replacing conventional meters with an LED bar graph results in a faster responding, more rugged display with high visibility that retains the ease of interpretation of an analog display. LED brightness is easily controlled with a single pot.The internal 10-step divider is floating and can be referenced to a wide range of voltages If you'll use this circuit for a 4 ohms speaker R1 should be 10k , 18k for 8 ohms and 30k for 16 ohms load .

Water Level Controller Detector . In most houses, water is first stored in an underground tank (UGT) and from there it is pumped up to the overhead tank (OHT) located on the roof. People generally switch on the pump when their taps go dry and switch off the pump when the overhead tank starts overflowing. This results in the unnecessary wastage and sometimes non-availability of water in the case of emergency.  The simple circuit presented here makes this system automatic, i.e. it switches on the pump when the water level in the overhead tank goes low and switches it off as soon as the water level reaches a pre-determined level. It also prevents ‘dry run’ of the pump in case the level in the underground tank goes below the suction level.    In the figure, the common probes connecting the underground tank and the overhead tank to +9V supply are marked ‘C’. The other probe in underground tank, which is slightly above the ‘dry run’ level, is marked ‘S’. The low-level and high-...

Battery Level Indicator 36 Volts Schematic Circuit Battery Level Indicator 36 Volts Schematic Circuit This battery level indicator offers (5) LEDs that light up progressively as the battery voltage increases. This is a update of the 24V Battery Level Indicator. While designed for 36V systems, it is easily modified to 24V, 48V or 60V simply by changing two resistors. LED Color Charge Level Red: Power Connected (0%) (essentially always on) Orange: Greater than 35V (25%) Yellow: Greater than 37V (50%) Green: Greater than 39V (75%) Blue: Greater than 41V (100%) (full charge is about 41 to 42V) Of course, you may select your own colors if desired. High voltage issues One limiting factor is the LM339 that has an absolute maximum voltage rating of 36V –and it is not good practice to operate near that point. The solution involves running the IC power rail off a zener shunt regulator. Shunt regulators are very simple, inexpensive and robust –good for this application. However, the LM339 ope...

Nokia may offer entry-level Windows Phone 7.5 devices by year's end, according to DigiTimes. Citing the usual "industry sources," DigiTimes said the new phones would be aimed at consumers in emerging markets, who are considered more price-sensitive. The hardware requirements for Windows Phone 8 are stricter than those for its predecessor, demanding a dual-core processor and support for near-field communication (NFC). Those features would be difficult to add to more entry-level and mid-level phones, according to the sources, prompting the need for less pricey Windows Phone 7.5 devices. (Credit: Josh Miller/CNET ) 

Sometimes it is necessary to connect a device which has only speaker outputs to external amplifier's line level inputs. Because speaker levels are much higher than line level signals, the direct connection does not usually give satisfactory results. That's the reason why I developed this signal level attenuator for connecting speaker signals to line level inputs without signal level problems. The circuit The circuit is designed to work with typical HIFI amplifiers where negative speaker connector (black) is connected to amplifier ground. Be careful here because some modern amps have both terminals actively driven. Connecting either one to a common reference could cause the output stage to smoke. Technical specs The circuit is suitable to be used with 1..50W audio amplifers. The circuit is connected to the speaker output of the amplifier and can be used in parallel with the existing speakers. Suitability for amplifiers: 1..50W Signal attenuation: 20 dB Input impedance: 10 kohm O...

Rotating laser levels, which are very handy  for setting objects in a room or garden at the  same height, are available at prices of a few  dozen pounds. At relatively large distances  and for outdoor use, the light from the rotating laser beam is often not easy to see, and  the laser beam detector described here can  be useful in such situations. The detector  works well at distances up to 50 metres (150  feet) and consists entirely of standard components. The detector is housed in a plastic case  that can be fixed to an object (such as a post  or a beam). It has three LEDs and a beeper that  indicate whether the object should be raised  or lowered. LEDs with a transparent package and integrated lens (round surface) are used as sensors. The top and bottom detection zones  each have five LEDs and two opamps (IC1a &  IC1b or IC1c & IC1d), which drive the ‘Move  Up’ and ‘Move Down’ indicator LEDs. The middle sensor LED drives the ‘OK’ indicator LED  via two opamps (IC2a & IC...

This circuit is designed to indicate the power level output of any audio amplifier. It's simple, portable, and displays three power levels can be adjusted to any desired value.   3 Level Audio Power Indicator Circuits Diagram Parts: R1__________100K    1/4W Resistor R2___________50K    1/2W Trimmer Cermet R3__________330K    1/4W Resistor R4____________ 1M2   1 /4W Resistor R5__________470K    1/4W Resistor R6 ,R7 _______500K    1/2W Trimmers Cermet R8____________ 1K5   1 /4W Resistor R9-R11______470R    1/4W Resistors   C1___________ 47pF   63V Ceramic Capacitor C2__________ 100nF   63V Polyester Capacitor C3___________47µ F   25V Electrolytic Capacitor C4____________1µ F   25V Electrolytic Capacitor   D1______BZX79C5V1 5.1V 500mW Zener Diode D2_________1N4148   75V 150mA Diode D3-D5________3mm.   Yellow LEDs   IC1_________ LM339   Quad Voltage Comparator IC...

Description Here is a easy to build low battery level indicator circuit that produces a visible indication by flashing a LED when the battery voltage drops below a predetermined voltage.The circuit is based on Panasonic’s  IC MN13811G   and a efficient flasher based on transistors Q1&Q2.Here when the battery voltage drops below 2.4  V the output of the IC is activated and the flasher starts flashing.This circuit here is an ideal one for monitoring the level of all types of 3V batteries.The circuit is power efficient with a  idle current drawing as less as 1 uA  , and a current drawing while flashing as less as 20uA. Circuit Diagram with Parts list . Battery Level Indicator Circuit Diagram Notes. Assemble the circuit on a good quality PCB or common board. Do not keep the soldering iron tip on the IC’s pins for long time. IC MN13811  series are available with different trip point voltages( from 2.4V t0 4.8V) ie MN13811G to MN13811U .If you need a tr...

This is the v2 by using PIC16F877A with minimum components. The most left circuitry is the same as in mains monitor; used to check to variation in ac voltage (operating range is between 200v ac - 240v ac). Five pull-up resistor circuitry is used to measure the water level in the desired water tank. Note that the push buttons are used here is only for illustration purpose, basically they are representing the probes (6 probes made of 28 gauge wire; one is of ground (reference) level). The left most probe indicates 20% of water in tank, next indicates 40% and so on till 100% or full level. Note that these probes should be inserted in water tank after measuring the tank size; then divide it in five equal levels to correctly measure the water level. The SPDT switch is used to on/off motor. D0 LED is indicating the position of this switch means if the switch is on it will glow to remind you. Note that if the water level is full and the motor switch is in on state motor wil...

The operating principle of the circuit is based on measuring the forward volt-ages of two identical diodes (check this first by measuring them). The forward voltage of a diode decreases with increasing junction temperature. lf a resistor is placed close to one of the two diodes, it will be heated slightly if it extends above the surface of the petrol. For best results,the other diode (used for reference) should be located at the same level. lf the diodes are covered by the petrol in the tank, the heating resistor will not have any effect because it will be cooled by the petrol. An opamp compares the voltage across the two diodes, with a slightly smaller current passing through the reference diode. When the petrol level drops, the output of the op amp goes high and the output transistor switches on. This causes a sense resistor to be connected in parallel with the sensor output. Several sensor circuits can be used together, each with its own switched sense resistor connected in pa...