Радиотехник free is an Android app that falls under the category of Education & Reference, specifically Books. The app is developed by Progressiv Digital Inc. and is available for free. The app's trial version offers cut-down information on the Basics of Radio Engineering, Radio Amateur Workshop, Radio Engineering Course, Soldering and Installation, Measurements and Equipment, a little LabVIEW For Radio Engineer, Acoustic Systems, Structures And Circuits, Repair to the Radio Master, Radio Amateur Handbook, Supplement Applications, and designs of various self-assembled voltage stabilizers such as Economy Class LF Amplifier, Audio Complex Amplifier, Transistor Tester, AM Transmitter at 3 MHz, and more.

The trial version of Радиотехник free provides a decent amount of information on various topics in radio engineering and is a good way to get a taste of what the full version offers. However, the trial version is limited and does not provide access to the complete range of features and information offered in the full version. Overall, Радиотехник free is a useful app for beginners or those interested in learning more about radio engineering.