At 05:09 PM 5/3/2010, you wrote:
>Only tested at room temperature, but working OK for approx. 5 years.
>
>R2 (100K) may be adjusted to compensate for leakage.

It's fine (< 100mV |Vbe| worst case), but you might want a resistor from
Vcc to GND.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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