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schematics - Buck switching regulator based on ATtiny84a -- please critique! - Electrical Engineering Stack Exchange
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ATtiny85 | Embedded Lab
DC-DC Step-Down Buck Converter Module Mini 360 Power Supply 3V 5V 16V MP2307 DIY | eBay
Atmel ATtiny15 Microcontroller Example DC to DC Converter Circuit – Electronics Projects Circuits
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What is a DC-DC converter? - Quora
AVR Microcontroller Doubles Up As A Switching Regulator | Hackaday