Timeline for use NPN as a switch between nets that don't have a voltage difference
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 12, 2021 at 12:38 | vote | accept | Peter Kapteyn | ||
| Jul 10, 2021 at 22:11 | answer | added | Bruce Abbott | timeline score: 2 | |
| Jul 10, 2021 at 20:50 | comment | added | Janka | I recommend using an analog switch IC as the CD4066 for this purpose. | |
| Jul 10, 2021 at 20:46 | answer | added | user57037 | timeline score: 1 | |
| Jul 10, 2021 at 19:04 | answer | added | gcr | timeline score: 2 | |
| Jul 10, 2021 at 17:12 | comment | added | Justme | Do note that a transistor has Vbe of about 0.7V, so it might be difficult to use a BJT for a button matrix. If you only need to push one button, why not use an analog multiplexer? If you wanted to push any of the 49 buttons, since that is only a 7 by 7 matrix, you can simply use two chips, eight channel analog muxes, to push any button. Even more safe solution would be to record the button code and play it back on some MCU so you don't have to physically do anything to your TV remote, not even open it. | |
| Jul 10, 2021 at 16:46 | comment | added | jonk | I've always been able to use a BJT (not necessarily always an NPN, though) to fake out a switch like this. It doesn't usually have to be a perfect switch. It just has to satisfy some conditions you need to work out, in detail. I'm fairly sure you can make the idea work. In this case, an NPN would probably work. Why don't you try? | |
| Jul 10, 2021 at 16:38 | history | asked | Peter Kapteyn | CC BY-SA 4.0 |