Timeline for How can I make 20-200 ohm variable resistor look like a 20-240 ohm resistor?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| May 31, 2019 at 8:55 | comment | added | Stuart Leask | So, a great suggestion from Transistor (above). If I change R4 to a constant current source: Transistor's suggestion, with a constant current source since car Volts can vary quite a lot! I believe the value for R3 will be fairly independent of the transistor specs? | |
| May 31, 2019 at 7:15 | comment | added | Transistor | Sure. Post a schematic as an update to your question (referencing my answer) and we'll review it. I've updated the answer with an error calculation. | |
| May 31, 2019 at 7:14 | history | edited | Transistor | CC BY-SA 4.0 |
Added error calculation.
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| May 31, 2019 at 7:11 | comment | added | Stuart Leask | Rather than regulating the voltage for R4, I can just add a transistor to make a constant-current source, I think? | |
| May 30, 2019 at 20:14 | comment | added | Stuart Leask | That looks just the ticket! I'll give it a whirl, thanks. | |
| May 30, 2019 at 17:32 | history | answered | Transistor | CC BY-SA 4.0 |
