Brightness Control for small Lamps

[ibrsel]

P1________________470K   Linear Potentiometer

R1_________________10K   1/4W Resistor
R2_________________47K   1/4W Resistor (See Notes)
R3__________________1K5  1/4W Resistor

C1_________________22nF   63V Polyester Capacitor
C2________________100΅F   25V Electrolytic Capacitor

D1,D2___________1N4148    75V 150mA Diodes

IC1_______________7555 or TS555CN CMos Timer IC

Q1_______________BD681   100V 4A NPN Darlington Transistor

LP1_______________1.5V 200mA Bulb (See Notes)

SW1_______________SPST Switch

B1__________________3V (Two 1.5V AA or AAA cells in series, etc.)