Timeline for Resistor chain substitute
Current License: CC BY-SA 4.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 24, 2022 at 15:44 | comment | added | Maple | I did some calculations and a couple 5k Microchip would have worked. They skip first band due to high wiper resistance but the rest fits nicely. Unfortunately they are impossible to source nowadays. The AD/Maxim chips begin at 10 or 20k and cannot be used. | |
| Dec 22, 2022 at 14:49 | comment | added | Maple | Also, regarding safety, these ports are designed for user-operated button pads. The golden rule of any human interface is that if anything can be pressed in a wrong time, it will be pressed eventually. So, the safety is implemented on the device side, giving us an opportunity to properly initialize interface. | |
| Dec 22, 2022 at 14:26 | comment | added | Maple | Yes, I have found those chips myself too, as well as some 30V from AD/Maxim. And yes, there is the problem with getting the value right. Most chips begin at 10k or 20k, and very few of them have 1024 taps. One solution I've mentioned in the comments would be to put two (or more) pots in parallel and use them to fine-tune combined resistance. Dual/Quad chips are great for this. There are dozens of safety requirements, of course. I am working on those separately, trying to keep the question straight on one point only. This usually yields better results here. | |
| Dec 22, 2022 at 10:41 | history | answered | Chester Gillon | CC BY-SA 4.0 |