I'm trying to put together a simple circuit to fade a string of LED's on
and off slowly. It needs to drive ten LED's in parallel and turn them
on and off slowly to give a nice slow pulsating effect, all running off
a 3v supply (2x AA batteries).

So far I've got a circuit consisting of a suspended bicore that outputs
through an inverter to a resistor capacitor circuit to the base of a
2222 that drives the LED's. To get the desired effect I had to use a
2200uf capacitor and a 1k resistor in the RC circuit. With a smaller
cap and a larger resistor there isn't enough current to drive the
transistor properly so the LED's are very dim. This big capacitor makes
the whole thing bulky and I think I've got a less than optimal, or
elegant, solution.

Any suggestions for an alternative. . .

Bill

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Bill Bigge
Autonomous Systems Lab
Room 5A23
Cognitive and Computing Sciences
Pevensey-II
Sussex University
Brighton
+44 (0)1273 877621
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wb23@...
www.cogs.susx.ac.uk