My grandfather had this Micronta VoxClock3 digital alarm clock that just had random digits displayed when you plugged it in and just overall acted crazy. Opened her up last night and found every single cap either completely open or ESR in the 50 ohm range. All caps replaced but waiting on a .47uf 50v cap to arrive as I didn't have any.
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Micronta Talking Alarm Clock Full Recap
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Micronta Talking Alarm Clock Full Recap
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Re: Micronta Talking Alarm Clock Full Recap
Originally posted by stj View Post.47? use a polyester cap - 470n--------------------------------------------------------------
Ryzen 3600x
16GB Patriot 3600MHz
MSI B450 Gaming Plus
MSI Air Boost Vega 56
Acer 32" 1440P Freesync
Rosewill Capstone 750W
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Hakko FX-888D Station
FX-8802 Iron
MG Chem .8mm 63/37 RA 2.2%
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Re: Micronta Talking Alarm Clock Full Recap
Originally posted by stj View Postwell even 1uf electrolytic caps are being phased out because film caps are small enough to replace them.
what chips are in that clock?
spo250? spo256? texas tms5110??--------------------------------------------------------------
Ryzen 3600x
16GB Patriot 3600MHz
MSI B450 Gaming Plus
MSI Air Boost Vega 56
Acer 32" 1440P Freesync
Rosewill Capstone 750W
--------------------------------------------------------------
Hakko FX-888D Station
FX-8802 Iron
MG Chem .8mm 63/37 RA 2.2%
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Re: Micronta Talking Alarm Clock Full Recap
Originally posted by stj View Postwell even 1uf electrolytic caps are being phased out because film caps are small enough to replace them.
what chips are in that clock?
spo250? spo256? texas tms5110??
--------------------------------------------------------------
Ryzen 3600x
16GB Patriot 3600MHz
MSI B450 Gaming Plus
MSI Air Boost Vega 56
Acer 32" 1440P Freesync
Rosewill Capstone 750W
--------------------------------------------------------------
Hakko FX-888D Station
FX-8802 Iron
MG Chem .8mm 63/37 RA 2.2%
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Re: Micronta Talking Alarm Clock Full Recap
TMS5110 speech synthesizer was in TI Speak & Spell, it used LPC linear-predictive coding. I think it had better speech quality than SPO256 allophones.
It looks like it could use a 1-bit or 4-bit databus to read ROMs. One IC must be the main MCU and another ROM.
TMS5110AN2L-1
MP1343
CM72010NL
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Re: Micronta Talking Alarm Clock Full Recap
Got the new .47 cap today and installed. Powered up without the daughter board even being re-soldered back in and it's working great! good crisp digits, no funny business. I'll post later on once I have it fully back together.--------------------------------------------------------------
Ryzen 3600x
16GB Patriot 3600MHz
MSI B450 Gaming Plus
MSI Air Boost Vega 56
Acer 32" 1440P Freesync
Rosewill Capstone 750W
--------------------------------------------------------------
Hakko FX-888D Station
FX-8802 Iron
MG Chem .8mm 63/37 RA 2.2%
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--------------------------------------------------------------
Ryzen 3600x
16GB Patriot 3600MHz
MSI B450 Gaming Plus
MSI Air Boost Vega 56
Acer 32" 1440P Freesync
Rosewill Capstone 750W
--------------------------------------------------------------
Hakko FX-888D Station
FX-8802 Iron
MG Chem .8mm 63/37 RA 2.2%
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Re: Micronta Talking Alarm Clock Full Recap
I need a video or sound snip to hear what it sounds like
In the 80's many red LED displays were behind a purple filter. I think it works much better for contrast (compared to red).
edit: youtube versions are crap https://www.youtube.com/results?search_query=voxclockLast edited by redwire; 05-21-2021, 03:45 PM.
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Re: Micronta Talking Alarm Clock Full Recap
Originally posted by jayjr1105 View PostMy grandfather had this Micronta VoxClock3 digital alarm clock that just had random digits displayed when you plugged it in and just overall acted crazy. Opened her up last night and found every single cap either completely open or ESR in the 50 ohm range.
Am I right in thinking that failing caps is a relatively rare phenomenon with this particular clock? O, rather, is this a widely-known problem with the VC 3 and most owners simply choose to bin their clock rather than taking the time and trouble to repair it?
(I ask because I was quite surprised to find a mere single mention of this nearly forty-year-old clock on the forum. Perhaps my sense of surprise is misplaced?)
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Re: Micronta Talking Alarm Clock Full Recap
I have this clock back in my possession. My grandfather claims it still acts weird after some time. I'll take it apart and give it a closer inspection for cracked solder joints.--------------------------------------------------------------
Ryzen 3600x
16GB Patriot 3600MHz
MSI B450 Gaming Plus
MSI Air Boost Vega 56
Acer 32" 1440P Freesync
Rosewill Capstone 750W
--------------------------------------------------------------
Hakko FX-888D Station
FX-8802 Iron
MG Chem .8mm 63/37 RA 2.2%
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Re: Micronta Talking Alarm Clock Full Recap
Originally posted by jayjr1105 View PostI have this clock back in my possession. My grandfather claims it still acts weird after some time.
I ask because, rather than using the 60 Hertz mains to maintain accuracy, this particular clock relies on the MCU frequency; I am not clear on why the manufacturer would do this (perhaps someone here knows?). However, I am informed this is not an accurate way to keep the clock synced when using the simple RC oscillator the clock was designed with.
(I know of no one else who owns one of these, so I hope you will not mind my asking.)
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