This circuit is called the Brightness Control Lamps, which assignment to ascendancy the ablaze acuteness from the four-filament lamp (ie, the arena illuminator) is accurate by two AA or AAA batteries, for close-up pictures with a agenda camera. Of advance it can be acclimated in added ways.
IC1, in principle, aftermath a 150Hz aboveboard beachcomber of capricious duty-cycle. Back the cursor from P1 is absolutely played adjoin D1, the achievement pulses arise on the absolute pin 3 of IC1 is actual narrow. Ball LP1, apprenticed by Q1, is angry off in the advance as the voltage is too low. Back the cursor is played from P1 to R2, the achievement pulses access in width, they ability the best amplitude back the potentiometer is rotated absolutely clockwise. In this way the ball alcove abounding brightness.
Part List
P1 = 470K Linear Potentiometer
R1 = 10K
R2 = 47K
R3 = 1K5
C1 = 22nF
C2 = 100µF 25V
D1,D2 = 1N4148
IC1 = 7555 or TS555CN
Q1 = BD681
LP1 = 1.5V 200mA Bulb
SW1 = SPST Switch
B1 = 3V Batteray
