nº1001

 

Proximity detector with one transistor, supply 2xR03

nº1000

 

Square root(1)

Square root (0,81)

Square root (2)

Voltage square root extractor; about 60mV remaining error; supply +/-5V_USB

nº999

 

Powerbank stand-by mode disabler. Many powerbanks will enter in stand-by mode when load current drops bellow a threshold level ranging from microamps up to about 50mA. Others will start hiccup its output voltage. A simple circuit with 2 transistors will prevent stand-by mode at the expense of only a few microamps.