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Build Your Own 3V LED Flasher Circuit Diagram
This collection of circuit diagrams is prepared for operation using a 3V battery.
Circuit Diagram
Components:
- R1, a 33K Ohm, 1/4 Watt resistor
- R2, R3, 47 Ohm, 1/4 Watt resistors
- C1, a 10µF, 25V Electrolytic Capacitor
- D1 (D2 LEDs (Any type and color))
- Q1, BC560, 45V, 100mA PNP Transistor
- Q2, BC337, 45V, 800mA NPN Transistor
Notes:
- The power supply can be adjusted between 2 and 4.5V.
- Adding D2 will result in two LEDs blinking alternatively.
- The duration of D1’s on-state is shorter than its off-state, while the opposite applies to D2.
- Alternatively, D2 can be utilized alone by shorting D1.
- The values of the resistors must remain unchanged.
- The flashing frequency can be modified by altering the value of C1 from 2.2µF to 100µF, or even higher.
- This circuit functions optimally when driving a 3.2V lamp. In this instance, removing the LEDs and R3, and connecting the lamp directly to Q2’s collector, will further minimize the number of parts required.
Integrated Circuits – Detailed Description
BC560 Transistor
The BC560 is a general-purpose NPN bipolar junction transistor, frequently used in various electronic circuits. It offers moderate gain and is suitable for switching and amplification applications. Characteristically, it operates with a collector-emitter voltage of 45V and has a current capacity of 100mA, rendering it appropriate for circuits needing moderate current handling.Integrated Circuits – Detailed Description
BC337 Transistor
The BC337 is a common-emitter NPN bipolar junction transistor commonly employed in switching and amplification circuits. It’s known for its relatively high current handling capabilities – a collector current of 800mA – and a collector-emitter voltage rating of 45V. This transistor is frequently utilized in simple switching circuits and provides a reliable solution for basic amplification tasks.
author: RED Free Circuit Designs
circuit from http://www.redcircuits.com/
circuit from http://www.redcircuits.com/