http://danyk.cz/zarivk_m_en.html
http://payalo.at.ua/index/dvukhtaktnyj_preobrazovatel_12v_400v_push_pull/0-225
http://www.electronics-lab.com/project/automotive-12v-to-20v-converter-for-audio-amplifier/
https://www.youtube.com/watch?v=WBSRhtDkucs