LED Flasher IIV
The described circuit is a basic flashlight design that utilizes a transistor-based switching mechanism to control an LED output. The circuit is powered by a voltage supply ranging from 4.5V to 12V, allowing for flexibility in power source selection.
The resistors R1 and R2, each valued at 150 kOhm, are likely used for biasing the transistors T1 and T2, which are BC 547B NPN transistors. These transistors function as switches, allowing current to flow through the LED (D2) when activated. The resistor R3, valued at 2.7 kOhm, may serve as a current-limiting resistor for the LED, ensuring that it operates within safe limits to prevent damage due to excess current.
The capacitor C1, with a value of 2.2 µF and a voltage rating of 16V, is likely included for stability and filtering purposes, smoothing out any voltage fluctuations that may occur during operation. The diode D1, a 1N4148, is utilized for its fast switching capabilities and may be included to protect the circuit from reverse voltage or to manage current flow effectively.
R4 is listed as 100 ?, which seems to be an incomplete specification and should be clarified for proper circuit integration. The red LED (D2) will illuminate when the circuit is powered and the transistors are activated, providing the intended flashlight functionality.
This circuit can be constructed in approximately half an hour, making it suitable for beginners or educational purposes. The simplicity of the design allows for easy modifications, such as replacing the LED with other types of light-emitting diodes or adjusting resistor values to change brightness levels. Overall, the design provides a practical example of using transistors in a basic electronic application.This is a simple design of a single flashlight. This small circuit is within a half hour to build. The circuit operates from 4.5 to 12 V. Of course it is possible other than to drive an LED. R1, R2 = 150 kOhm R3 = 2.7 kOhm R4 = 100 ? C1 = 2.2 V ?F/16 D1 = 1N4148 D2 = LED red T1, T2 = BC 547B 🔗 External reference
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