Meters Circuits
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This might seem like a dumb question, but I`m a total newb in electronics. I built this preamp to amplify the signal from a small speaker that i use.... -
A simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i. e. at low frequency, period is measured for a complete wave and.... -
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.... -
This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system. It was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other 12V systems. Lead acid.... -
This pdf file shows the schematic diagram of my home-built circuit to drive the PDR-56 probe. A JKL BXA-12579 inverter commonly used to drive cold-cathode fluorescent lamps is used as the high-voltage power supply. The BXA-12579 produces 1, 500 VACRMS for a.... -
A couple of few years ago I had build a diode-sensor based RF powermeter using a 68HC11 microprocessor. Even before that I had build an analog RF powermeter with thermal power sensor. And I found datasheets of logarithmic amplifiers very interesting, that.... -
This article describes how to build a simple inductance meter. The PCB layout is included.... -
A meter is a measuring instrument. An ammeter measures current, a voltmeter measures the potential difference (voltage) between two points, and an ohmmeter measures resistance. A multimeter combines these functions, and possibly some additional ones as well,.... -
This very simple high-level design demonstrates the product`s structure. Its integrated circuit responds to button presses and senses temperature via the probe, displaying the temperature on the LCD and sounding the buzzer when finished. This more detailed.... -
An excellent way to provide continuous and direct indication of ESV readings in even a large lecture hall is to combine this instrument with a tonal voltmeter (TVM). The TVM puts out an audible tone of constant amplitude, with the frequency related to the.... -
Most PN-junction diodes can be used as photodiodes. While not optimized for this application, they do work. When the diode is reverse biased, it will produce a small photovoltaic output as the light level is increased. LEDs are particularly suited for this.... -
It is very easy to use and consumes so little current that it will work for the battery`s shelf life. The circuit uses a standard LM35DZ sensor (IC3) whose analogue output voltage is buffered by an LM358 (IC2A). The voltage is read by the microcontroller and.... -
![become a VU meter and homemade rhythm lights easy [megapost]](uploads/25/LM3916schematics.jpg "become a VU meter and homemade rhythm lights easy [megapost]")
Post related to Do it yourself about become a VU meter and homemade rhythm lights easy.... -
Can someone help me find a schematic and codes about a digital thermometer using a LM35 and 7 segment display(0 - 150.5 degree celcius)..the code must .... -
Hello, I need a simple to make LED based (not 7-segment) voltmeter to monitor the voltage of a variable supply. I have found this circuit.... -
hello , I am planningto build Digital Thermometer using ATmegsa8 and LM335. Can Somebody tell me how should i go about ?? I want to display it on.... -
I have been able to monitor the power usage of the home with the Power Node. One project I have been meaning to tackle is to monitor the water usage as well. The photo below shows my main water meter. I also have a "sub-meter", which measures the water usage.... -
Bipolar junction transistors transfer a current from a lower-resistance emitter to a higher-resistance collector. You can use this property to measure inductance.... -
Using MAX1496 an ADC with LED drivers, you can make your own 3 1/2 digit voltmeter with just a handful of components. It even has external/internal Vref, HOLD and PEAK as well as 200mV, 2V rangs.... -
The input cap for The phototransistor at the bottom is what feeds the opamp. But the output from the phototransistor is always between GND and Vcc. So why the need for an input capacitor It`s most likely there because the photo transistor is not being.... -
Here`s a simple schematic of one of the parts, the idea is that if the probed voltage is below half point, one LED will be on, otherwise second one will be on. Also, now I think I`ll need to oompff the power on this thing, proper dc motor with some gearbox.... -
1N4001 a 1Amp Silicon rectifier with voltage range of 50 to 1000 Volts and possessing features such as guaranteed high temperature soldering, high current capability, diffused junction, low reverse leakage, utilizes void-free molded plastic technique for low.... -
Most multimeters today have an auto turn-off feature built in. There is enough space in a multimeter enclosure so why not to install a simple circuit that.... -
This circuit breaks an input voltage signal down into its components: (1) the absolute value and (2) the polarity or ‘sign (+ or ). It will handle direc.... -
This simple circuit indicates the amount of power that goes to a loudspeaker. The dual-color LED shows green at an applied power level of about 1 watt. At 1. 5 watts it glows orange and above 3 watts it is bright red. The circuit is connected in parallel.... -
This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and should be available from many parts stores. The 1K resistors in the circuit are essential so that the.... -
The circuit of the Celsius thermometer in the diagram is based on the well-known Type LM334 from National Semiconductor. This IC is a sensor that provides.... -
This digital DIY tachometer for bikes uses two reed switches to get the speed information of the bicycle. The reed switches are installed near the rim of.... -
Remote sensor sends data via mains supply, Temperature range: 00.0 to 99.9 °C This circuit is intended for precision centigrade temperature measurement, w....
.jpg "A simple Electronic Microcalorimeter")
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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