Meters Circuits
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This circuit is another radio frequency (rf) field strength meter, similar with our previous field strength meter circuit, but with lower supply voltage (only a single cell 1. 5V battery). Here is the schematic diagram of this rf strength meter circuit: To.... -
This is a circuit of Audio Decibel Level Meter. This circuit uses the SA604 which not only designed as an RF device but also the Received Signal Strength Indicator (RSSI). In a cellular radio, the radio`s microcomputer uses that function to monitor the.... -
The schematic diagram below show a complete barometric pressure signal conditioner that operates from a single 1.5V battery. We can get the best accuracy and... -
This capacitance meter circuit is similar with previous meter circuit, but it uses transistors rather than logic gates. Here is the schematic diagram: You... -
Capacitance meter is one instrument that you should have in your toolbox if you are an electronics hobbyist, or if you`re a professional electronic technician ... -
The frequency formula of 555 oscillator is popularly known. For a known resistors and capacitor, the frequency can be determined by a formula. From the math... -
Why measure the temperature of the coffee? Well, coffee taste depends on two things. First, how strong the coffee is and second, how hot it is. The second... -
With a few resistors, LEDs and using a LM3914 bar/dot display driver IC we can construct a simple 5V Voltmeter Monitor Circuit which provides TTL-compatible undervoltage and overvoltage warning signals. A complete circuit can be shown in the schematic below.. -
This diy digital thermometer circuit can measure temperatures up to 150?C with an accuracy of ?1?C. The temperature is read on a 1V full scale-deflectio... -
The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section.. -
This circuit is a circuit diagram digital voltmeter with LED display. It`s ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V.... -
This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculated in kilometers per hour (KPH). Its display has three digits. This radar works with the laser.... -
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply.... -
PIC16F84A Digital Thermometer Circuit The digital thermometer circuit is built, almost all by using the temperature sensor of some form of discrete components,... -
This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV / 0C is expl... -
We can construct a tachometer using the TC9400 in the F/V mode to convert the frequency information (RPM) into a linearly proportional voltage. Then we can compare this voltage to one of n comparators (on this example using 8). The respective LED lights up.... -
This circuit is a series-FET Voltmeter FETVM. This FETVM to replace VTVM function while at the same time line used to clean the appliance cord. In addition, the rate of drift is far superior to vacuum tube circuit allows full-scale range of 0.5 volts is the.... -
If you have a digital voltmeter, or any voltmeter with millivolt resolution and high input impedance, then you can use this temperature-to-voltage adapter... -
Frequency meter can be used in speed sensor, tachometer, or any measurement of repetitive signals. This frequency to voltage converter (FVC) can be used to turn... -
The circuit was designed for the purpose of creating a voltmeter with high impedance that would measure Direct Current voltages across any types of circui... -
Almost all 24V power systems in trucks, 4WDs, RVs, boats, etc, employ two series-connected 12V lead-acid batteries. The charging system can only maintain the sum of the individual battery voltages. If one battery is failing, this circuit will light a LED..... -
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.... -
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A very simple circuit of indication of level, with 10 Led. Is used the circuit of half-wave rectification of precision round the IC2, with gain one. With switch S1, we can select the indication of Led. The level of entry is 60 mV-1.25 V.. -
The circuit is placed parallel with the exit of power amplifier and us gives the level of signal ,from output. Changing resistance R1, in the input circuit, we adapt the indication of power, in the resistance of loudspeaker, that we use.. -
This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding.. -
This inductance meter is actually an adapter to your digital voltmeter (DVM). Using this circuit now your voltmeter is capable of measuring inductor value. Inductance meter is very helpful in designing switch mode power supply, since its often needed to wind.... -
This is Circuit LM3914 LED VU Meter. use IC1-LM3914 and Transistor BC109C, By circuit will show level of audio signal(power Music) is dB in six level by LED... -
The circuit was conventionally designed with eight LED audio level meter made out of two low power quad op-amps which utilizes LM324. Volume Unit ... -
Copyright of this circuit belongs to smart kit electronics. In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic. This is an easy to build, but nevertheless very accurate and useful.... -
Most analogue multimeters are capable of measuring resistance over quite a wide range of values, but are rather inconvenient in use due to the reverse reading scale which is also non-linear.. -
This tachometer lets you measure heartbeats, respiratory rates, and other low-frequency events that recur at intervals of 0.33 to 40.96 seconds. The circuit senses the period offm, computes the equivalent pulses per minute, and updates the LCD accordingly.....
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.....
Popular Circuits
A professional suggestion for those interested in improving sound. The circuit constitutes the...
The second half controls the steering. The mechanical design is a 3 wheeled caddy with the...
A device designed for measuring time and temperature used in chemistry laboratory. The circuit...
This amplifier functions over a wide range of gains, typically 1-10. It combines the LT1010 and a...
This decade box can be set for any resistance value between 10 and 11.1 in 10- stops. A switch...
An infrared remote control car, the AT89S51 microcontroller as the core controller, DC motor with...
This is the simple freeze protector circuit diagram. It is also called timing circuit. It is just...
One problem this causes is that the lovely USB port that I have been using to communicate with...
Here is a schematic of a good quality AM radio receiver circuit. The heart of the circuit is...
The schematic shown here is a project of a simple temperature sensor circuit or we can also say...
J1 And J2 are a matched pair of J310`s (can also use U310`s or a U431 matched pair). R2 is...
The device is based on a GSM/GPRS module with included GPS. Its main function is to detect and...
Fluorescent tube is connected in the LC resonant circuit composed of L2 and C9. Bidirectional...
The design of the charger is similar to that of many commercially available chargers. The charger...
As we all know, if the power transformer neutral line circuit, and when the three-phase...
Circuit as shown by the 555 oscillator and amplifier driver stage composition. 555 and R1, R2,...