Timeline for Power supply auto cut-off required when there is no audio signal
Current License: CC BY-SA 4.0
11 events
| when toggle format | what | by | license | comment | |
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| Apr 26 at 7:50 | comment | added | Nayan Panchal | But anyways to make it power efficient I'm going to build a Monostable mode for a 40secs circuit with LMC555 and hoping that Bird Out will trigger the mode for Chimes and Bird In will trigger another 40secs for Dancing melody and it should work as we are expecting, Will give it a try on this weekend and let you know the outcome. | |
| Apr 25 at 11:20 | comment | added | Nayan Panchal | (Continued) So now I've powered it with a 3 AA D Size Alkaline one, and now observing what time it lasts longs... | |
| Apr 25 at 11:19 | comment | added | Nayan Panchal | Agreed and will give it a try, firstly I powered it via 2 AA D-size dry batteries which lasted longer for 80 hours, and then I read the entire datasheet of PAM8403 and noticed they mentioned "The recommended operating voltage is 5.5V. When the PAM8403 is powered with four battery cells, it should be noted that the voltage of four new dry or alkaline batteries is over 6.0V, higher than its operation voltage, which will probably damage the device. Therefore, it's recommended to use either four Ni-MH (Nickel Metal Hydride) rechargeable batteries or 3 dry or alkaline batteries." | |
| Apr 24 at 15:53 | comment | added | SamGibson♦ | (continued) My approach would be completely different, by first analysing & reverse-engineering the original clock, looking for a suitable digital signal there, to enable the external amplifier. However as you have now explained that you don't have an oscilloscope, you can't easily do that :( || I wish you the best of luck with your project. | |
| Apr 24 at 15:53 | comment | added | SamGibson♦ | (continued) "monostable with 555ic" I didn't recommend the 555 - a standard 555 would be a poor choice as it specifies Vcc > 4.5 V. Depending on what components you have available, you could consider one of the CMOS 555 versions with lower minimum Vcc (e.g. some work down to 1.5 V) and without the large current spikes of the original 555. || I don't have more time to invest in your project in its current state, sorry. There are just too many missing details. I hoped my suggestions would be useful for you to continue work on your problem, since you have the devices in your hands. I don't. | |
| Apr 24 at 15:53 | comment | added | SamGibson♦ | @NayanPanchal - "the clock is installed in living room and it contains big output soundbar and other noises" This is new information, so I wasted my time explaining option 1 for the reason you explained. || "using speaker output as a trigger to 555ic?" You cannot use the speaker output directly in that way. I explained the circuit blocks I consider would be needed, in option 2. || "3 AA D size batteries" That's confusing. There are AA size batteries (really cells). There are D size batteries. I don't know what you mean by "AA D size batteries", although this doesn't change my replies. | |
| Apr 24 at 10:34 | comment | added | Nayan Panchal | I'm fine with any pre-built or to build with Schematics, even we can have 2 mono power efficient amplifier as well... | |
| Apr 24 at 10:31 | comment | added | Nayan Panchal | Hey I would be fine with any other amplifier as well which automatically shuts when there is no input signal or any other power efficient amplifier to play hourly chims in additional 8ohm 1w (2 speakers) and can be powered by 2 or 3 AA D size batteries or even with 9v HW (Hi-Watt) battery if it last longs for 2-3 months, so we can remove PAM8403 add-on, the amplifier should be loud only there is no bass to play just a bird chims and dancing music 😉 | |
| Apr 24 at 9:26 | comment | added | Nayan Panchal | When we connect LED to monostable with 555ic it glows but my question is if we power that 555ic with 3 AA D size batteries will it work and if we replace LED with PAM8403 power input will it work?, I know it's try and error exercise but asked if you have tried before or have some insights. | |
| Apr 24 at 9:20 | comment | added | Nayan Panchal | Yes definitely was thought the same to add microphone controller but as the clock is installed in living room and it contains big output soundbar and other noises, so that is not feasible to have it, but the monostable option we can look forward, Yes Bird In/Out may work as trigger and labeled Swing Dancers may also work as trigger to 555ic Monostable, my quick question would be using speaker output as a trigger to 555ic? | |
| Apr 23 at 17:39 | history | answered | SamGibson♦ | CC BY-SA 4.0 |