Meters Circuits
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This is a simple and low cost wide band VHF field strength meter. The field strength is measured by converting the radio signal to DC and measuring it. The RF signal will be picked up by the coil and rectified by the diode D1. Even a very small DC voltage is....
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Simple 0-5 digital voltmeter using 8051 (AT89S51 microcontroller) with circuit diagram and assembly language ASM code. Simple digital voltmeter....
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Here is a very simple wind meter (anemometer) circuit. I can`t guarantee much on the accuracy of this circuit but it circuit works quite fine. You can measure wind speeds up to 75m/s using this circuit. The transistors Q1 and Q2 are used for sensing the....
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This is a simple circuit diagram of 5-LED audio VU meter using IC KA2284/KA2285. The KA2284, KA2285 are monolithic integrated circuit. It is a logarithmic display driver IC. And it is Bar type display driver using 5-Dot LED. The KA2284/KA2285 has a wide....
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This Class E RF amplifier will deliver up to 400 watts of RF output, depending on the input voltage and tuning parameters (current). The amplifier uses inexpensive IXDD414 Driver ICs - one for every 2 MOSFETs. Transient Voltage Supressors (TVS devices) are....
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Home built NMR spectrometer, showing the construction and circuitry. Demonstates 90 degree and 180 degree pulse sequence, and generation of FIDs and spin echos at 18 MHz....
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The function of sound level displayer circuit to improve the out look of your amplifier circuit or your Radio player. Actually this gives an unbelievable ....
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The following circuit shows about Designing Simple Digital Multimeter Circuit Diagram. This circuit using the ADD3501. Features: combines (volts, ....
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This Circuit using only a single cell 1.5V battery.C1 need to be adjusted for peak reading. Then, to use it, turn on the transmitter and meter. ....
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The following circuit shows about UHF Indicator Wavemeter Circuit Diagram. This circuit using dual BF494 Transistor. Features: oscillator is ....
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The following circuit shows about Field Strength Meter Circuit Diagram. Features: useful for radio frequency hobbyist and enthusiast, uses only ....
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Function: Used for measure the voltage change minute by management before the temperature diodes. Component: IC, Diode, Resistor, 3-1/2 digit LCD (SP521PR)....
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The following circuit shows about Tachometer Circuit Project. This circuit built based on the 555 Timer IC. Features: monostable IC, voltage ....
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This is simple 3-digits digital volt meter. PIC16F676 used to read analog signal(voltage) and display the value on 3-digits 7-segment. You can apply to mesasure DC currant with parallel Rshunt but I`m not descript here. As we know the most of PIC....
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Good Preparation. I like this. There is one suggestion you can use RFM70 or RFM22 for RF communication....
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A simple low cost Infrared LED speedometer is described that can be fitted to a skateboard, longboard or even a bicycle to measure speed. Notes on building, setting-up and calibration are given. When used with a low cost data logger continuous measurements....
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To measure the frequency response of the e-meter, a Wein Bridge oscillator, oscilloscope, and single-ended power supply were used. (Ironically, a bridge oscillator is being used to measure a bridge detector. ) The oscillator uses a TL074 quad op-amp,....
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The board is rather simple and is based on a PCF8574 providing to the I2C the output of a CD 4040 counter. A dip switch is provided to select the PCF8574 address and some leds for power on and wind activity. The DIP switch was not soldered thus the circuit....
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The Allegro ® A8732 is a Xenon photoflash charger IC designed to meet the needs of ultra low power, small form factor cameras, particularly camera phones. By using primary-side voltage sensing, the need for a secondary-side resistive voltage divider is....
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The analog to digital sketches have been covered a million ways from Sunday with every conceivable part but in order for us to move on to more complex circuits and concepts I need to be sure you know these simpler ones. This tutorial wont be quite as in....
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Another cause of voltage drift is the input current of IC1, which slowly charges capacitor C1, this can especially be seen when the output voltage is about 0 Volt...
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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....
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This is a very straightforward circuit. The first stage acts as a crystal receiver. Use a germanium detector diode (like 1N34, but AA119 is much more common in Europe), a silicon one won`t do. The frequency is determined by L and C. For the FM band and VHF,....
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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....
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This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand or the clothes of the person carrying the bag by means of a tiny cord. If the bag is snatched....
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This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring if it conducting ac....
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This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components....