The authors analyse the most common free and shareware software for analysis and generation of sound signals, which is based on the use of ADC (analogue-to-digital converter) and DAC (digital-to-analogue converter) of a computer sound card. With the accordance to the present paper, there is practically no domestic Ukrainian-language software for working with ADC and DAC sound cards. The authors propose to use affordable personal mobile cardiographs, both for the study of biopotentials and the processing of other low-frequency signals. The staff of Chemistry Department of G.S. Skovoroda KhNPU has been developing a software and methodological complex of SchoolKit, one of the applications of which is called SoundCardScientificKit. It includes an audio signal analyzer, a special shape signal generator, and a frequency spectrometer. This software is universal and widely used. Therefore, it can be used both in research, and to demonstrate physical phenomena associated with sound or electrical oscillations of low frequency from 20 to 20,000 Hz. The main functions and interface of the SoundCardScientificKit software are described. The authors conducted testing the special form signal generator of the SoundCardScientificKit application with Realteck High Definition Audio sound card. The results showed the reproduction of the programmed frequency to be occuring with high accuracy. The principle circuits of potential amplifiers used in the development of electrocardiographs, myographs, etc., were analyzed. A simple circuit of the biopotential amplifier based on three TL082 chips has been developed, which includes a high-efficiency noise filter with a frequency of 50 Hz. The paper shows this amplifier to have been used to obtain an ECG (electrocardiogram). Particular attention is paid to the environmental aspects of the creative activity of students. The authors suggest that, when developing electronic devices, if possible, one can use the equipment that requires disposal. Reusing unusable equipment not only removes the problems associated with processing, but also allows students to learn about the principles of operation and design features.

Chemistry Department of H.S. Skovoroda Kharkiv National Pedagogical University develops a program-methodical complex (PMK) SchoolKit. It is based on three software tools: ChemKit - designed to measure temperature, electromotive force, amperage, control devices (heaters, power sources, etc.); SoundCardScientificKit - focused on the use of DAC (digital-to-analog converter) and ADC DAC (analog-to-digital converter) computer sound card; created for visualization of low-frequency signals and generation of signals of a special form; ColorKit - developed for processing photos, movies and visual data in real time for scientific purposes. This software has been tested in student and master's projects. All tools for working with visual data are divided into two categories: functions - non-specialized tools (allow to be fully creative, require some skills to work with the application, are a significant help in creating algorithms for processing visual data for the user's own software) and tools - specialized tools that simulate the operation of devices such as colorimeter, refractometer, spectrophotometer, polarimeter. To reduce the cost of projects, the paper proposes to use: digital-to-analog (DAC) and analog-to-digital (ADC) sound card converters, photo and video devices and other available peripherals in the development of digital learning tools. The paper also describes the interface and capabilities of ColorKit software. Its versatility shows that a student or teacher could build their own research system by adding and configuring macro modules. This software allows not only on the basis of visual data processing to make various measurements (colorimetric, refractometric, spectrophotometric, determination of the photosynthetic surface, etc.), but also to clearly demonstrate the principles of physicochemical devices. Peripherals for this software can be easily made by hand. Devices developed by students on the basis of ColorKit software have been repeatedly presented at various competitions: Junior Academy of Science, "Touch of Nature", "Water Net". The paper defines the main directions of applications of software ColorKit, ChemKit, SoundCardScientificKit in STEM training. Further prospects for the development of ColorKit software are outlined. The paper marks up the necessity of development of domestic educational digital laboratories and training of specialists in this field.