Meters Circuits
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The potentiometer value is not critical: anything from 1 k © to 100 k © is acceptable. If you have built the "precision potentiometer" described earlier in this chapter, it is recommended that you use it in this experiment. Likewise, the actual values of the.... -
A pre-requisite for this article is that you have the GCC AVR programming environment installed as described in my "Programming the AVR microcontroller with GCC, libc 1. 0. 4" article. If you want to avoid troubles with the installation you can of course use.... -
The Atmega8 microcontroller from Atmel has plenty of digital and analog input/output lines. It is the ideal device to develop any kind of measurement equipment. A pre-requisite for this article is that you have the GCC AVR programming environment installed....
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This application note describes the design of a PC-based, 14-bit data acquisition system. It takes a system approach, includes all the necessary building blocks: analog, digital, hardware, and software. It discusses each step, testing systems separately.... -
THE OP-AMP: The Op-Amp used for the signal meter circuit is a TL061. An LF351 works just as well, however and has the same pin layout. If you have a TL062 or similar the differing pin-outs are shown below so that you can design your circuit board.... -
Unlike almost all SMD resistors, the SMD ceramic capacitors are not marked with their values. To find the value of these capacitors we need a capacitance meter.... -
The input signal it is applied to a gate G and then to a counter, for a precisely period of time After this period of time, the input signal it is stopped for a while and then the cycle it is repeated. In the time of break the content of counter it is.... -
This DS18S20 digital thermometer provides a precision of 0. 5 °C and SCRATCHPAD it`s read at every 800ms. Capacitors C5, C6 and diodes D8, D8 makes a voltage doublers which power the lcd panel. The DS18S20 temperature sensor it`s wrapped in a thermo.... -
This project, based on an article published in the February 2008 edition of Radcom (the magazine of the Radio Society of Great Britain) is for a meter with a 50 ohm input impedance for measuring very small RF powers. Many RF power meters become inaccurate at.... -
This circuit is composed of a temperature sensor, amplifier, V/F converter, three digit binary coded decimal (BCD) counter, time base and seven segment led displays. In addition to the 9400 V/F converter, other ICs need for this project include the LM334.... -
I found that my sprite, burdened with an extra electrical load from an electric cooling fan, just barely kept the battery charged. My intended solution to this problem is an electronic voltage regulator; however, it seems obvious that, before changing the.... -
The simple circuit offers no isolation, but the simplicity of the circuit combined with cost of sound cards and the fact that diodes 1 and 2 add a good measure of protection makes this circuit ideal for the average user. Notice the physical hardware includes.... -
The A3008, when plugged into the same LWDAQ Multiplexer, can create bad messages in a Data Receiver ( A3018 ). Set the A3008 local oscillator to its minimum (DAC count 0) or maximum (DAC count 255) frequency to reduce the bad message rate. Even better:.... -
The oscillation circuit of the transmitter was added. An oscillation circuit by 555 IC is used for a modified circuit. This is to adjust an oscillation frequency easily. Thereby, it is necessary to change the software... -
The ultrasonic signal which was received with the reception sensor is amplified by 1000 times(60dB) of voltage with the operational amplifier with two stages. It is 100 times at the first stage (40dB) and 10 times (20dB) at the next stage. Generally, the.... -
An electric fence, perimeter protection circuit, designed to run on batteries, and provide configurable pulses of up to 20KV, to protect a tent perimeter against bears or other animals, out in the wild. The device uses two 555 timer circuits to generated a.... -
An efficient, stable, easy to build construction for all your radiation dosimetry needs. I started from scratch, designing a complete dosimeter unit around the Atmel Atmega8 microcontroller and a Russian Geiger Muller tube. Here you`ll see the CTC-1 tube,.... -
The schematic for this project is fairly large and you can see the complete schematic below. To explain what is happening here I will split it into two sections which I will call the analog and digital sections. The schemtic below (click to enlarge it) is.... -
The schematic is very simple for this tutorial. It is just a matter of wiring up the ADXL320 sensor to the PIC and the LED. The power circuitry assumes you have a battery of +5v to power the PIC. You can create your own custom circuitry for this or just use.... -
This transmitter had its origins as a conventional shunt fed Hartley oscillator for 80 meters using a pair of 27 triodes connected in parallel; with 300 VDC on the plates of the 27`s, I was able to get about 4 watts output ( with decent stability ) for about.... -
This Hartley oscillator was built on the remains of a single tube Hartley using a single 45. The original circuit I constructed was one that was published in a 1932 QST article by George Grammer. As it turned out, both of the 45s I had were weak, so the.... -
When using an analog meter to set the output of a power supply used for testing 12-volt equipment, an expanded voltmeter scale has a decided advantage and accuracy over a linear scale. Figure 1 shows the original meter scale and the expanded scale used in.... -
The RF signal is split into two signals that are shifted 90 degrees out of phase (one plus 45 and one minus 45 degrees). Both are mixed to audio frequencies. The two audio signals are again shifted 90 degrees out of phase (again one plus 45 and one minus 45.... -
The AVO VCM 163 is one of the few tube testers (British: valve tester) being able to measure tube electrode currents, e. g. plate and screen current (fig. 1, left-hand meter movement) as well as mutual conductance (fig. 1, right-hand meter movement).... -
Feature of an offered frequency meter that he besides the main function allows to define inductance of various coils, resonant frequency of contours, capacity of condensers. The combined device which schematic diagram is shown on fig. 1 becomes the good....
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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