Timeline for How to output a true analog voltage at output pin
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Mar 28, 2019 at 12:27 | comment | added | Majenko | @FilipFranik Except they're not R-2R ladders. They're just a chain of resistors with a FET connected to each connection between resistors. There is only R. Many Rs all the same. Yes, if you write it up with the two ends of the potentiometer to VCC and GND you get kind of a DAC, but it suffers the same kind of impedance problems a real potentiometer does. It provides a pair of resistances, whereas a DAC provides a voltage. | |
| Mar 28, 2019 at 7:55 | comment | added | Filip Franik | @Majenko I just wanted to add that there exist "digital potentiometers" or "digipots" that are pretty much R-2R ladders inside a DIP-8 chip. They are cheaper then DACs. (For example X9C103) | |
| Nov 30, 2016 at 0:35 | comment | added | Majenko | @AndreHolzner I count an R-2R ladder the same as a DAC chip but with too many wires to make it practical on your average Arduino. | |
| Nov 28, 2016 at 16:54 | comment | added | Andre Holzner | or use an R-2R ladder as a "poor man's DAC" | |
| Nov 28, 2016 at 13:48 | comment | added | bytk | Thank you. Option 2 sounds really good, but due to time constrains, I went ahead with Option 3 and got the results I wanted. | |
| Nov 28, 2016 at 13:47 | vote | accept | bytk | ||
| Nov 28, 2016 at 10:26 | history | answered | Majenko | CC BY-SA 3.0 |