[time-nuts] Regulating a pendulum clock

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Aug 8 21:11:36 UTC 2010


J. Forster wrote:
> You are picking very unimportant nits.
>
> If there were a small noise spike from the opamp, it'd goose the pendulum
> a tiny amount. That would be corrected on the next swing.
>
Heuristic analysis of this type is counter productive.

> You are turning a trip to the corner store into an Apollo Moon Mission.
>
Reliability is paramount in a circuit that may be required to work for 
decades.

> BTW, since the =drive does not to be bipolar, one of the NPN and PNP
> transistors can be deleted. They never turn on. So you are left with two
> opamsa, =each with a simple emitter follower.
>
The original request was for a bipolar drive.
The lack of short circuit protection is poor design practice when 
driving an external load.

> -John
>
> ==============
>

Bruce




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