M
MP
- Jan 1, 1970
- 0
Hi,
I have been struggling on this for almost 2 weeks and I hope someone
can help me.
I have a Duraband AM/FM digital alarm clock radio. It work on SC8560
which takes either 50Hz or 60Hz line input for frequency reference.
Unfortunately, my power line frequency is not stable and drifts from
48.5 to 50hz results in my clock slowing down be few minutes every day.
So I am using a 2.45760 Mhz crystal, Divide by 4096 using CD4060 to
generate 600Hz and then divide by 10 using CD4018. The 600Hz and
60Hz waveforms are generated neatly.
However, when i connect the 60Hz i.e. Pin13 (Q5) of CD4018 to the
50/60Hz input pin of SC8560, the entire LED display freezes and shows
1P:G8 All the keys to set the hour and time also freeze... Can
some one please help ?
1. I have used BC547 to drive the output of CD4018 and then connect
the collector to the SC8560 but it does not help.
2. I am using the same powersupply for the 8650 and CD4060/18. It
seems that 8650 works on negative voltage. ( I doubt that my problem
is to do something with this.. but not sure what !!!)
There are few more problems that i face
1. The CD4060 does starts oscillations only after 20sec of power on.
I am not able to figure out a reason for the same.
2. I am trying to use the shareware software zelscope to view the
waveforms on my laptop using the sound card as input probe. In the
frequency view, the 600Hz waveform appears neatly, but the when i
divide it by 10, the software shows it as 64.6Hz instead of 60Hz. Is
this a software error, noise in the probe, line humming disturbance etc
or is it really NOT 60Hz ???
I have been struggling on this for almost 2 weeks and I hope someone
can help me.
I have a Duraband AM/FM digital alarm clock radio. It work on SC8560
which takes either 50Hz or 60Hz line input for frequency reference.
Unfortunately, my power line frequency is not stable and drifts from
48.5 to 50hz results in my clock slowing down be few minutes every day.
So I am using a 2.45760 Mhz crystal, Divide by 4096 using CD4060 to
generate 600Hz and then divide by 10 using CD4018. The 600Hz and
60Hz waveforms are generated neatly.
However, when i connect the 60Hz i.e. Pin13 (Q5) of CD4018 to the
50/60Hz input pin of SC8560, the entire LED display freezes and shows
1P:G8 All the keys to set the hour and time also freeze... Can
some one please help ?
1. I have used BC547 to drive the output of CD4018 and then connect
the collector to the SC8560 but it does not help.
2. I am using the same powersupply for the 8650 and CD4060/18. It
seems that 8650 works on negative voltage. ( I doubt that my problem
is to do something with this.. but not sure what !!!)
There are few more problems that i face
1. The CD4060 does starts oscillations only after 20sec of power on.
I am not able to figure out a reason for the same.
2. I am trying to use the shareware software zelscope to view the
waveforms on my laptop using the sound card as input probe. In the
frequency view, the 600Hz waveform appears neatly, but the when i
divide it by 10, the software shows it as 64.6Hz instead of 60Hz. Is
this a software error, noise in the probe, line humming disturbance etc
or is it really NOT 60Hz ???