Computer mouse generator. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Computer mouse generator. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Computers

Comments on the article

After acquiring a new optical manipulator ("mouse") for my computer, I decided to find a useful application for several still serviceable old mechanical ones. For experiments, I used the "Genius" NetSCROLL "PS / 2 manipulator model K300S210-A.

When examining the printed circuit board of the "mouse", it was found that a 5 V supply voltage is supplied via a four-wire cable to terminals 5 and 12 of the DD1 controller (see diagram). Since there are no positional designations of elements on the board, hereinafter the numbering of parts is conditional. Three IR emitting diodes, photosensors, three current-limiting resistors, three microswitches and a four-pin connector. included in the "mouse" are not shown in the figure.

Computer mouse generator

After connecting the board to a laboratory power supply (it should, of course, be disconnected from the computer), using an oscilloscope and a frequency meter, it was revealed that on the free output 8 of the controller there are rectangular pulses with a duty cycle of 2 ("meander"), an amplitude equal to the supply voltage, and a frequency of 74950 Hz. When the supply voltage was reduced to 2,5 V - twice - the frequency decreased to 73550 Hz - by less than 2%.

It became clear that after a simple refinement, the "mouse" can be turned into a fairly stable generator. Since the signal power at terminal 8 of the controller is very small, the generator is supplemented with a power amplifier based on transistors VT1, VT2. allowing to increase the output current of the generator up to 0.4 mA, with a current-limiting resistor R3, an adjusting resistor R6, which can change the amplitude of the output signal, and a decoupling capacitor C3.

In order to be able to change the frequency of the output signal, a constant resistor with a resistance of 273 kOhm. connected to terminal 7 of the controller is replaced by the R1R4R2R5SA1 circuit. The number of frequency subranges can be increased by using the SA1 switch to a larger number of positions and changing the values of the resistors R1, R2, R4, R5 accordingly. You just need to keep in mind that the total resistance in the output circuit 7 of the controller in any position of the switch SA1 should not be less than 4,3 kOhm.

If the manipulator is no longer intended to be used for its intended purpose, the IR emitting diodes must be turned off to reduce the current consumption. An additionally introduced VD1 diode protects the generator from erroneous connection to a power source in the wrong polarity.

Installation of additional connections should be carried out with the MGTF-0,07 wire. The transistors are used in a flat miniature TO-92S package with dimensions of 4,3*3,9x2.5 mm. Instead of 2SC144E, any transistors of the 2SC2669, 2SC2710, 2SC2785, 2SC3488, 2SD1020, KT315 series are suitable, and instead of 2SA1150R - 2SA1174, 2SA1175, 2SB810.KT361. Variable resistor R4 - RP1-46 or SDR-45a. Instead of high-resistance selection constant resistors R1, R2, you can use any trimmers. Capacitor C3 - imported. Diode VD1 - KD923A (with a Schottky barrier). If it is possible to regulate the supply voltage, any silicon low-power diode can be used. When the generator is powered from a permanently connected source, the diode VD1 can be excluded.

In cases where the indication of the generator is not needed, the R7HL1 circuit is removed.

Author: A.Butov, village of Kurba, Yaroslavl region

See other articles Section Computers.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Your own windmill on the roof 05.09.2006

In the French town of Equien-Plage, an apartment building with a horizontal wind turbine on the roof has been built.

Two rotors 5 meters long give 7000 kilowatt-hours per year, which is enough for heating and lighting halls, landings and corridors of a house with 40 apartments.

Other interesting news:

▪ Soil houses

▪ Reusable oil absorbing sponge

▪ Crystals against poisons

▪ When playing with a child, look at him

▪ 100mW UV LED 200-280nm range

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Firmware. Article selection

▪ article Servant of the people. Popular expression

▪ article Who solved a difficult math problem by mistaking it for homework? Detailed answer

▪ article Vibration and its protection

▪ article Signal Generator. Encyclopedia of radio electronics and electrical engineering

▪ article They cut her, but she is whole. Focus secret

Leave your comment on this article:

All languages of this page

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