This circuit is a simple design for brightness control lamps circuit, which is the circuit is based on 7555 IC for core operation. This is the figure of the circuit.
The operation work to control light intensity from the four filament lamp (the ring illuminator) is supported by two AA or AAA battery, for close up pictures using digital camera. The circuit will be used in another ways. The principle work of the circuit is IC1 produce 150 Hz square wave of variable duty cycle. When the cursor from P1 is fully played against D1, the output pulse appears on the positive pin 3 of IC1 is very narrow. Bulb LP1, driven by Q1, is turned off in the lead as the voltage is too low. When the cursor is played from P1 to R2, the output pulse increases in width, they reach the maximum amplitude when the potentiometer is rotated in full clockwise. In the way the bulb reaches full brightness
Part Component:
P1 = 470K Pot, R1 = 10K, R2 = 47K, R3 = 1K5, C1 = 22nF, C2 = 100uF/25V, D1/D2 = 1N4148, IC1 = 7555 or TS555CN, Q1 = BD681, LP1 =1, 5V 200mA Bulb, SW1 = SPST Switch, B1 = 3V Battery
The operation work to control light intensity from the four filament lamp (the ring illuminator) is supported by two AA or AAA battery, for close up pictures using digital camera. The circuit will be used in another ways. The principle work of the circuit is IC1 produce 150 Hz square wave of variable duty cycle. When the cursor from P1 is fully played against D1, the output pulse appears on the positive pin 3 of IC1 is very narrow. Bulb LP1, driven by Q1, is turned off in the lead as the voltage is too low. When the cursor is played from P1 to R2, the output pulse increases in width, they reach the maximum amplitude when the potentiometer is rotated in full clockwise. In the way the bulb reaches full brightness
Part Component:
P1 = 470K Pot, R1 = 10K, R2 = 47K, R3 = 1K5, C1 = 22nF, C2 = 100uF/25V, D1/D2 = 1N4148, IC1 = 7555 or TS555CN, Q1 = BD681, LP1 =1, 5V 200mA Bulb, SW1 = SPST Switch, B1 = 3V Battery
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