Lots of people ask about low voltage brightness control circuits so i believe this can be very useful circuit for you.I suppose you can use this for various purposes.So try this circuit...
Parts:
Q1 BD681 100V 4A NPN Darlington Transistor
P1 470K Linear Potentiometer
C1 22nF 63V Polyester Capacitor
C2 100µF 25V Electrolytic Capacitor
D1,D2 1N4148 75V 150mA Diodes
IC1 7555 or TS555CN CMos Timer IC
R1 10K 1/4W Resistor
R2 47K 1/4W Resistor
R3 1K5 1/4W Resistor
LP1 1.5V 200mA Bulb
SW1 SPST Switch
B1 3V (Two 1.5V AA or AAA cells in series, etc.)
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