Rail-Rail DIP SPST Buffer

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01:03:17

Only requires 2 NPN transistors and 2 resistors per switch…  Perfect for driving a resistor ladder based DAC from a dip SPST switch array!

The Purpose of this is to convert SPST switches into push-pull SPDT switches so that in the ON position everything is pulled HIGH, and in the OFF position, everything is pulled LOW.  This is a pretty simple and very close Rail-Rail way to do it.  

The Max output will be exactly at Vcc Potential, while the minimum output will be only a few 10’s of millivolts above GND Potential!  Specifically only 18.2mV above GND in this simulation.  Pretty Awesome results considering the simplicity, and it makes it a perfect buffer for building a resistor ladder based DAC!

published 2 years ago

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