Timeline for 22mA dummy load
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Apr 14, 2020 at 15:29 | comment | added | Wintermute | Thank you. Very clear and satisfying answer! I will get to building the circuit. Thanks! | |
| Apr 14, 2020 at 15:27 | vote | accept | Wintermute | ||
| Apr 14, 2020 at 15:26 | comment | added | Neil_UK | With this particular regulator, 4 V is the minimum you can sink from, due to its dropout, 40 V the maximum, though you could use an LDO instead, and an input cascode. The current isn't easily programmable. There's a minimum current of the regulator's I<sub>Q</sub>. Using an opamp, and pass element of a BJT or FET would allow you to circumvent all of these shortcomings, at the expense of complexity. Often it will come down to what parts you have in your stock box, and almost everybody has an odd 317 lying around. | |
| Apr 14, 2020 at 15:15 | comment | added | Wintermute | Thank you. Simple elegant solution! Used voltage regulators many times however as a voltage source. Funny how we look at particular component in one way failing to remember principles of it. Also follow up question. Many circuits are based on op-amp controlling BJT or FET e.g. forum.arduino.cc/index.php?topic=90343.0 Is there any benefit of this approach compare to resistor and voltage regulator you posted? | |
| Apr 14, 2020 at 14:48 | history | answered | Neil_UK | CC BY-SA 4.0 |