Meters Circuits
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The common 555 timer IC forms the heart of the circuit. Its function is to charge the unknown capacitor (Cx) to a fixed voltage. The capacitor is then discharged into the meter circuit. The meter measures the current being drawn through the 47 ohm resistor..... -
This circuit was developed by Luigi Falcone, I1FLC. He uses seven plug in coils covering 3. 0 to 30Mhz in a Colpitts oscillator circuit. The coaxial socket J2 permits connection to a frequency meter when required. The coils are wound on Teflon formers with.... -
This is a high quality RF signal meter based around the Analog Devices AD8313 0. 1 GHz - 2. 5 GHz logarithmic detector IC. It is capable of detecting signals as low as -80 dBm. When combined with 2. 4 GHz or 915 MHz bandpass filters, it makes a quick visual.... -
This Time Domain Reflectometer (TDR) based on circuit idea published in Electronics Design October 1, 1998 magazine. Time Domain Reflectometer modified version by Tomi Engdahl which you see in this document. The circuit has been tested with wide variety of.... -
This meter circuit uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that.... -
There are plenty of digital thermometers with ·1 C displays but the accuracy is about + 1 C and you can not calibrate them. I made this thermometer circuit from components that were available at the local electronics hobby shop and it was an educational.... -
It`s a very useful circuit which when installed on your car gives the voltage of you car battery in a LED dot display form. The meter circuit is based on four comparators made of quad op amp LM324. The inverting inputs of IC are kept at at reference voltages.... -
Circuit This circuit was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this circuit monitors the output of the TV`s FM detector IC via a shielded lead. To initially calibrate the meter, adjust.... -
This be LED VU Meter by IC LM3914 circuit show with LED convenient for the stereo or sound all signal. This easy circuit again because use IC LM3914 show get 10 the level. Build easy because use the integrated circuit just one and the price is inexpensive..... -
The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs indicating volume level. Each of the 8 comparators is biased at increasing voltages set by the voltage divider so that the lower right LED comes on first when the.... -
The circuit, is a comparator, can measure with step of 1Volt, the voltage of battery of car. The clue of voltage become after comparison of voltage of battery, that is applied in the inverting inputs of amplifiers, with voltages of reference that are.... -
This circuit uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that senses.... -
This Digital Alarm Speedometer Circuit. It allows us to appraise the acceleration of any article moving, abnormally cars and added vehicles. The acceleration is affected in kilometers per hour (KPH). Its affectation has three digits. This alarm works with.... -
The aim of the project is to build simple low cost inductance meter. The main parts of the project are IC 555, Transistor, resistor and capacitor.... -
How to build a voltmeter for DC voltage measurements without using multimeter testing This is a simple digital voltmeter circuit that can measure voltages from 0V to 9V. The main part of this circuit is a dot bar display driver IC LM3914. Input voltage.... -
Here is a simple 1KHz audio distortion meter that can measure the Total Harmonic Distortion (THD) on any load at any out put power. Here you have the option to select 2, 4, 8 or 16 Ohm loads. The circuit works by filtering the 1 kHz fundamental signal using.... -
A simple audio level meter or a Volume unit VU level meter circuit with diagram and schematic. This sound level meter is designed using transistors with a flat frequency response in the range of 20Hz to 50Khz.... -
A simple audio watt meter circuit or an audio power or audio level meter circuit with diagram and schematics to measure amplifier audio output power in watts.... -
The circuit diagram of a simple capacitance meter using IC LM2917 is shown here. The LM2917 is a high gain monolithic frequency to voltage converter IC from National Semiconductors. Even though the main application of LM2917 is in tachometers, it can be also.... -
A simple digital thermometer circuit with out a micro controller and having a seven segment LED read out is shown here. The circuit is based on three ICs: CA3162, CA3161 and LM35. CA3162 is a monolithic analogue to digital (A/D) converter that has BCD.... -
The circuit given here is of a very useful and accurate digital voltmeter with LED display using the ICL7107 from Intersil. The ICL7107 is a high performance, low power, 3. 5 digit analog to digital converter. The IC includes internal circuitry for seven.... -
A digital volume control circuit diagram using DS 1669, a potentiometer IC.This can be used as a digital volume controller for audio amplifiers and other applications.... -
Here is a handy field strength meter that can be used to check the strength of AM radio signals. The circuit is a very useful for those who assemble radio transmitters(especially in the tuning of the final stage for maximum range). The circuit is essentially.... -
A high impedance DC voltmeter using a uA741 IC is shown here. The operational amplifier is used as a non-inverting DC amplifier in which the negative feedback is through a DC meter requiring 1mA for full scale deflection. Since R6 is 100 Ohms, the meter will.... -
An LED Thermometer which can be used as a temperature sensor or temperature measurement circuit built using LM 34 -a Fahrenheit display or LM 35-degree Celsius display of temperature.... -
The micro ampere meter shown here is basically a DC millivolt meter. The circuit gives full scale deflection for 0. 1V input. The current to be measured is passed through a known resistance R and the voltage drop across it is measured. Here the IC 1 uA 741.... -
We know that every inductor coil has a certain amount of resistance and the coil should have lowest possible resistance. The ratio of the inductive reactance to the effective resistance of the coil is called the quality factor or Q-factor of the coil. A high.... -
RMS value of the sinusoidal waveform is meas ured by the average reading voltmeter of which scale is calibrated in terms of rms value. This method is quite simple and less expensive. But sometimes rms value of the non-sinusoidal waveform is required to be.... -
A sound level meter circuit with diagram and schematic using IC LM 3915,which is an audio level measurement chip.Used to display amplifier sound level or a microphone sound level.... -
Here is a simple circuit that can be used to check the sound levels. The sound pressure meter is vey useful in setting up home theater systems, if you need to test the sound pressure of each channels on different positions in the room. The circuit is nothing.... -
Stereo VU meter / 2 channel audio level meter using IC TA7666P. Volume level of each channel is displayed using 5 LEDs .This loudness meter uses minimum number of external componets.... -
Here is a simple circuit that can be used as a tachometer. The circuit is basically a frequency to current converter which converts the incoming signal into a proportional current to drive the meter. The deflection on the ammeter will be proportional to the....
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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