1 EEVblog #262 - World's Simplest Soft Latching Power Switch Circuit
Dave Jones presents a low part count soft latching power switch built around a P-channel MOSFET and push button; hobbyists use it as a starting point for one-button power control.
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Dave Jones presents a low part count soft latching power switch built around a P-channel MOSFET and push button; hobbyists use it as a starting point for one-button power control.
Demonstrates a microcontroller running through the protection diodes on its I/O pins with the supply pin disconnected; cited whenever a supposedly unpowered chip keeps working.
Dave Jones shows how a microcontroller's square-wave output can drive a charge pump to double its supply voltage; suggested when a small higher-voltage rail is needed.
Dave Jones explains the basics of driving a bare segment LCD from simple IO pins, recommended to people who have wired one up as if it were an LED display.
Dave Jones looks at a microcontroller costing about three cents; linked in threads on picking tiny, cheap parts and on splitting a job across several small chips.