Timeline for Resistor chain substitute
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 31, 2023 at 3:37 | vote | accept | Maple | ||
| Dec 21, 2022 at 20:12 | comment | added | Maple | Oh, and yes, CI is always positive relative to return. In most devices the return is internally connected to ground (24V battery "-") either directly or via fuse, as far as we can tell from documentation. | |
| Dec 21, 2022 at 19:46 | comment | added | Maple | You are right, the cost would not be a factor in mass production. But the PCB size would grow unnecessary. I was rather hoping for some kind of "current mirror" type of circuit, only with voltage input on one side and variable resistance independent of the applied voltage on the other. Then one 4-channel DAC chip can drive four such stages | |
| Dec 21, 2022 at 19:31 | comment | added | Hearth | @Maple Depending on precision needed, I can find 34 Ω resistors in bulk for less than $10 for 5,000 of them, and suitable MOSFETs for $16 for 100. That's not that expensive in my book. You'd be paying more on the circuit board (say $150 from a cheap fab) than on the parts. | |
| Dec 21, 2022 at 19:22 | comment | added | Maple | This should work. Although the goal was to reduce a number of components, not increase it. We have 4 channels, so 68 FETs and 68 resistors would be quite expensive, even if arrays were used. | |
| Dec 21, 2022 at 19:07 | history | answered | Hearth | CC BY-SA 4.0 |