power supply

http://320volt.com/en/0-30v-0-002-2a-ayarli-opamp-ve-transistorlu-guc-kaynagi/
http://320volt.com/en/6v-12v-smart-charger-circuit-for-lead-acid-batteries/
http://320volt.com/en/14-4v-charger-circuit-lead-acid-batteries-lm350t/
http://9zip.ru/home/uc3842_uc3843_charger.htm