Timeline for turn on an LED with a pressure switch but it will not turn off until you reset the switch
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Jul 10 at 23:14 | comment | added | Adzi B | Good answer, I haven't actually had a chance to play around with SCRs yet in my now 8 years of study and employment within electronics, useful circuit to know | |
| Jul 9 at 21:41 | comment | added | Solomon Slow | @DanHladil, also note: Maybe this is obvious, but any momentary power interruption will reset the state to "off." If your application requires the reset switch to be hidden/inaccessible, then you'll also need the power supply to be hidden/inaccessible. | |
| Jul 9 at 21:34 | comment | added | Solomon Slow | @DanHladil, Note: R1 is only there to limit the current through a bare LED chip (D1). If you're not using a bare LED—if you're using any kind of a lamp module that is designed to run from a constant voltage power supply, then you don't need R1. You do need to be aware of the current and voltage ratings for the SCR, you might need to be aware that the SCR will "drop" one to two volts from the supply voltage, and if the power of the lamp is more than a few tens of milliwatts, then you may need to mount the SCR on some kind of heat sink. | |
| Jul 9 at 21:34 | history | edited | vir | CC BY-SA 4.0 |
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| Jul 9 at 21:27 | history | edited | vir | CC BY-SA 4.0 |
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| Jul 9 at 21:21 | history | edited | vir | CC BY-SA 4.0 |
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| Jul 9 at 21:19 | comment | added | Solomon Slow | Brilliant! Solves the problem in a much simpler way than using CMOS logic gates. Especially so if the lamp needs a different voltage than the CMOS parts and/or if the lamp needs more current than the CMOS can source or sink. | |
| Jul 9 at 20:04 | history | answered | vir | CC BY-SA 4.0 |