Timeline for Why are two 555 timers in separate sub-circuits cross-talking? (Poltergeist in the Breadboard)
Current License: CC BY-SA 4.0
29 events
| when toggle format | what | by | license | comment | |
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| Jan 27, 2021 at 6:00 | answer | added | Mustafa YETİŞ | timeline score: 1 | |
| S Jan 22, 2021 at 8:17 | history | suggested | Ed Randall |
Added tag "decoupling"
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| Jan 22, 2021 at 8:02 | review | Suggested edits | |||
| S Jan 22, 2021 at 8:17 | |||||
| Jan 22, 2021 at 6:05 | answer | added | Souvik Saha | timeline score: 1 | |
| Jan 22, 2021 at 0:46 | comment | added | Seamus | NE555s are notorious for noise & self-interference. Use a low power version of the 555 if possible. | |
| Jan 21, 2021 at 12:42 | comment | added | Bimpelrekkie | @Technophile Yes the wires and metal strips have inductance, roughly 1nH per mm. But I'm quite that those inductances aren't doing anything noticeable in this circuit. As the supply bypassing was already mentioned, I didn't mention it again. | |
| Jan 21, 2021 at 2:47 | answer | added | IchabodKunkleberry | timeline score: -2 | |
| Jan 21, 2021 at 1:05 | comment | added | Technophile | @Bimpelrekkie wires (including the stamped sheet-metal strips inside the breadboard) have inductance as well. Thus a 555 version with faster transistors/MOSFETs inside may need better supply bypassing. | |
| Jan 21, 2021 at 0:00 | history | tweeted | twitter.com/StackElectronix/status/1352043277114109955 | ||
| Jan 20, 2021 at 22:58 | history | edited | Ad N | CC BY-SA 4.0 |
I don't think implementation is a synonym for "power bus"?
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| Jan 20, 2021 at 22:38 | comment | added | Hot Licks | They're cross-talking because they got lonely. | |
| Jan 20, 2021 at 21:52 | history | edited | Voltage Spike♦ | CC BY-SA 4.0 |
edited body
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| Jan 20, 2021 at 20:46 | answer | added | Voltage Spike♦ | timeline score: 8 | |
| Jan 20, 2021 at 19:30 | history | became hot network question | |||
| Jan 20, 2021 at 16:34 | comment | added | Ad N | @Neil_UK Thank you, I found some comfort in your answer. Although I do not know if you already had the Make: Electronics books in your hands? It feels like a very gentle introduction to electronics and circuits, taking you by the hand (which I do need), letting you build a "lemon battery", etc. It does not feel like the kind of book assuming knowledge of supply decoupling : ) | |
| Jan 20, 2021 at 14:53 | answer | added | StainlessSteelRat | timeline score: 33 | |
| Jan 20, 2021 at 14:20 | comment | added | Neil_UK | @AdN Unfortunately power supply decoupling is so commonly required that some books fail to mention it as it's 'obvious'. Every IC should have its own PSU decoupler as close to the VCC and GND pins as you can manage, 10n or 100n will generally do, no exceptions. Then use a 10u to 100u at the board level. | |
| Jan 20, 2021 at 12:49 | comment | added | Sredni Vashtar | here's a visual demonstration of the lock-in: youtube.com/watch?v=G7ULnQ9i7H0 | |
| Jan 20, 2021 at 12:18 | comment | added | asdfex | @AdN A random NE555 datasheet (guess it was from TI) | |
| Jan 20, 2021 at 12:08 | comment | added | Ad N | @BrianDrummond Thank you, this is a good question to ask to Charles Platt then ; ) (I did not hear about power supply decoupling until now, if that is required by such circuit I would have hopped the book introduced it in time instead of having me losing evenings and hairs). | |
| Jan 20, 2021 at 12:08 | answer | added | Justme | timeline score: 10 | |
| Jan 20, 2021 at 12:03 | comment | added | Ad N | @asdfex Thank you. What are you citing? | |
| Jan 20, 2021 at 11:56 | answer | added | HandyHowie | timeline score: 16 | |
| Jan 20, 2021 at 11:56 | comment | added | Bimpelrekkie | Are both timers completely separated or it there still something that's shared? Do each have their own independent power supply? I don't think so. Also, all the wires and connections that make the power supplies have some series resistance so if one timer does something like switching on the LED, there's a small voltage change on the other timer's supply. That voltage change is enough to make the other timer also switch on its LED. | |
| Jan 20, 2021 at 11:39 | comment | added | user16324 | Where's the power supply decoupling? | |
| Jan 20, 2021 at 11:38 | comment | added | Andy aka | Show your schematic diagram please. | |
| Jan 20, 2021 at 11:37 | comment | added | asdfex | "A bypass capacitor is highly recommended from VCC to ground pin; ceramic 0.1 μF capacitor is sufficient." | |
| Jan 20, 2021 at 11:33 | review | First posts | |||
| Jan 21, 2021 at 2:31 | |||||
| Jan 20, 2021 at 11:30 | history | asked | Ad N | CC BY-SA 4.0 |