Electronic tachometer for motorcycle. Scheme, description

Electronic tachometer for motorcycle. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Automobile. Speedometers and tachometers

Many motorcycles, mopeds, motosleds and other motor vehicles do not have such an important device as a tachometer. I offer a simple and reliable tachometer. It is designed to work with a single-cylinder two-stroke internal combustion engine with a contact or non-contact ignition system and allows you to measure the crankshaft speed up to 10000 rpm. The tachometer circuit is shown in fig. one.

In the initial state, the transistor VT1 is closed, and VT2 is open. At this time, the left (according to the diagram) plate of the capacitor C 5 is connected through the low resistance of the open transistor VT2 to the +5 V bus. At this time, the current does not flow through the PA1 microammeter. With the first negative half-cycle of an alternating voltage applied to the input of the tachometer, the transistor VT1 opens, and VT2 closes. At this time, C5 is rapidly charged through the microammeter RA1, VD3 and R5.

(click to enlarge)

With a positive half-cycle of the input voltage, VT1 closes, and VT2 opens. Now C5 is discharged through the low resistance of the open VT2 and VD4. With the next negative half cycle, the process is repeated.

Trimmer resistor R6 sets the upper limit of the frequency of the measured signal. The value of C5 is selected depending on the type of engine. The higher the engine speed, the smaller the capacitance of capacitor C5 should be. A properly assembled setup does not require. It is only necessary to set the maximum tachometer readings with a trimmer resistor R6 by opening the engine throttle to the end.

The connection diagram of the tachometer to the electrical equipment of the motorcycle is shown in Fig. 2.

Electronic tachometer for motorcycle

If the ignition is contact, the tachometer input is connected to point A. For non-contact ignition, to point B.

Author: S.Sych, Brest region, Kobrin district, Orekhovsky village; Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Automobile. Speedometers and tachometers.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

The existence of an entropy rule for quantum entanglement has been proven 09.05.2024

Quantum mechanics continues to amaze us with its mysterious phenomena and unexpected discoveries. Recently, Bartosz Regula from the RIKEN Center for Quantum Computing and Ludovico Lamy from the University of Amsterdam presented a new discovery that concerns quantum entanglement and its relation to entropy. Quantum entanglement plays an important role in modern quantum information science and technology. However, the complexity of its structure makes understanding and managing it challenging. Regulus and Lamy's discovery shows that quantum entanglement follows an entropy rule similar to that for classical systems. This discovery opens new perspectives in the field of quantum information science and technology, deepening our understanding of quantum entanglement and its connection to thermodynamics. The results of the study indicate the possibility of reversibility of entanglement transformations, which could greatly simplify their use in various quantum technologies. Opening a new rule ... >>

Mini air conditioner Sony Reon Pocket 5 09.05.2024

Summer is a time for relaxation and travel, but often the heat can turn this time into an unbearable torment. Meet a new product from Sony - the Reon Pocket 5 mini-air conditioner, which promises to make summer more comfortable for its users. Sony has introduced a unique device - the Reon Pocket 5 mini-conditioner, which provides body cooling on hot days. With it, users can enjoy coolness anytime, anywhere by simply wearing it around their neck. This mini air conditioner is equipped with automatic adjustment of operating modes, as well as temperature and humidity sensors. Thanks to innovative technologies, Reon Pocket 5 adjusts its operation depending on the user's activity and environmental conditions. Users can easily adjust the temperature using a dedicated mobile app connected via Bluetooth. Additionally, specially designed T-shirts and shorts are available for convenience, to which a mini air conditioner can be attached. The device can oh ... >>

Energy from space for Starship 08.05.2024

Producing solar energy in space is becoming more feasible with the advent of new technologies and the development of space programs. The head of the startup Virtus Solis shared his vision of using SpaceX's Starship to create orbital power plants capable of powering the Earth. Startup Virtus Solis has unveiled an ambitious project to create orbital power plants using SpaceX's Starship. This idea could significantly change the field of solar energy production, making it more accessible and cheaper. The core of the startup's plan is to reduce the cost of launching satellites into space using Starship. This technological breakthrough is expected to make solar energy production in space more competitive with traditional energy sources. Virtual Solis plans to build large photovoltaic panels in orbit, using Starship to deliver the necessary equipment. However, one of the key challenges ... >>

Random news from the Archive

HP EliteBook Folio Notebook PC 16.01.2016

HP Inc. introduced the HP EliteBook Folio, the thinnest and lightest laptop HP has ever made. The novelty combines modern design and many business-grade features, changing the traditional view of "computers for work". The EliteBook Folio is 21% thinner and up to 15% lighter than the HP EliteBook 1020. It is only 12,4mm thin (smaller than an AA battery) and weighs less than 1kg.

The 12,5-inch (31,75 cm) EliteBook Folio is housed in a polished, diamond-cut aluminum chassis for durability and an original look. Like other models in the Elite line, the EliteBook Folio has passed 120 hours of testing through the HP Total Test process to ensure it meets the MIL-STD standard.

The EliteBook Folio has a hinge that allows the laptop to open 180 degrees. This allows you to use the device in a team. The laptop also features a full-size HP Premium Keyboard, a click pad with Windows 10 gesture support, and two USB-C ports with Thunderbolt 3. And the optional HP USB-C Travel Dock allows you to connect your peripherals on the go.

The bezel-less glass display is also available in Ultra HD (UHD) 4K (352 ppi) for precise detail. The UHD panel renders 95% of the Adobe RGB color gamut, ensuring high brightness images.

HP has partnered with Bang & Olufsen to ensure accurate audio reproduction in all cases. State-of-the-art components and workmanship have increased the volume by up to 40% over previous HP devices, so the Folio can be used for hands-free calls. The four speakers are optimized for a wide range of sounds, from voice to music and video. In turn, the conference call buttons on the keyboard make it easy to manage calls, and the calendar button allows you to view your scheduled tasks without switching to the desktop.

Other interesting news:

▪ Chicken and beef production reduces CO2 emissions

▪ Created mirrors of 1000 atoms

▪ An easy way to check your heart

▪ Ocean floor cleaning robots

▪ Measured time without using a clock

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Application of microcircuits. Article selection

▪ article Constitutional law of the Russian Federation. Crib

▪ How is the periodization of the history of the Middle Ages presented? Detailed answer

▪ article Bayonet knot. Travel Tips

▪ article Sound probe-ohmmeter. Encyclopedia of radio electronics and electrical engineering

▪ article Three experiments with a glass. physical experiment

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews