Hi Antonio,
the 32kHz Xtals are 2mm long tuning forks (that is what I believe
although I have not opened one).
You would have very little chance of modifying it and still have
enough Q left for it to oscillate.
As an alternative you could build an external circuit (a few uA at 3V
supply) and generate a signal to inject into
the existing Xtal osc with the Xtal removed.
The type of circuit that I would build would be a cmos binary divider
connected to a quad gate.
The 4 gate inputs connect to selected binary stages of the divider.
When the gate decodes the
selected number, an extra pulse is added to the count chain. The
output is thus shifted to a higher
frequency.
If you are interested I can try to design the circuit for you, I have
intend to build a Siderial clock
dial for my TBolt.
cheers, Neville Michie
On 17/05/2011, at 7:58 AM, iov...@inwind.it wrote:
Neville,
at present I have not enough skill with micros to solve the problem.
I think I will try modifying a crystal. This would not be that
difficult using
a lapping sheet or the like. And opening the can would be quite
easy using hot
air. This is the fastest way for me, and the device will continue
to be powered
by a simple AA cell, which is a non negligible advantage in my
application.
All the best,
Antonio I8IOV
Antonio,
it is quite easy to make an external circuit that uses a 32kHz xtal
and divides
it down to siderial seconds. It is also easy to drive most analog
quartz clock movements from
an external circuit.
Just what signal do you need? What frequency? and what does it drive?
(an alternate polarity
quartz clock motor?)
It can also be done with a micro if you have the skills.
cheers, Neville Michie
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