No protection against external shorts or other undesired events.
Extensive analog filtering to avoid creating an effective radiator of
noise may also be necessary.
Simple analog techniques are probably simpler/cheaper once the necessary
filtering and protection are included.
Bruce
Don Latham wrote:
Hmmm lemme see. I think I'd use a 12 volt supply and two transistors
driven by two outputs on my Arduino,basic stamp,picaxe or other whizzie.
I'd then implement a PID controller essentially using the 1 sec pulse from
the pendulum and the 1 sec pulse from my Rb, satellite receiver, crystal
clock, or whatever. The appropriate output pin will be brought to ground,
and the other driven as a pdf with the rate given by the pid loop.
Temperature and even pressure corrections can be applied within the gizzie
software. External parts, minimum. Opportunity to play with tuning,
maximum.
Don
Bruce Griffiths
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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