I am just reading the first page of the "The x-Chapters"
When I read the line: "PWM for dc motors - a myth demolished" a thought pop out of my brain:
There is something missing:
The peltier element - how to avoid PWM and ripple. Fun with PIR sensors - what you should do and what not.
The LM741 - please dont use it anymore. :-)
Any other ideas for topics we realy need?
Olaf
PWM doesn't always work too well with Peltier elements - the heat transferr ed across the junction is a more or less linear function of the current thr ough it, but the ohmic heating in the junction is proportional to the squar e of the current - you can use PWM to get the current you want, but you hav e to filter out most of the high frequency content before it goes through t he junction.
It's not all that difficult.
Sloman A.W., Buggs P., Molloy J., and Stewart D. ?A microcontroller
-based driver to stabilise the temperature of an optical stage to 1mK in th e range 4C to 38C, using a Peltier heat pump and a thermistor sensor? ? Measurement Science and Technology, 7 1653-64 (1996)
good topics are almost endless. You can only put so much in a book.
NT
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