Cheap Protection ... The circuit

[Bernd Felsche]

Thanks for all the hints and comments on the means of protecting
inputs.

The first draft of the circuit schematic can be found at
	http://www.perth.dialix.com.au/~bernie/tech/LW.pdf

I've done a few trial layouts and the components "fit" easily on a
50mm-square single-sided PCB with only two air-wires.

It's not yet a working design; still need to check on how to drive
some sort of audible warning (at the moment I'm using a "spare"
buffer on to 4050), to confirm the driving of the FET (which will be
PWM), and to finalise values for the input filter caps and
resistors.

-- 
Real Name: Bernd Felsche
    Email: nospam.bernie at perth.DIALix.com.au
     http://www.perth.dialix.com.au/~bernie - Private HP
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