Led Or Lamp Flasher electronic circuit diagram

Parts:

R1_______33K 1/4W Resistor
R2,R3____47R 1/4W Resistors
C1_______10Î…F 25V Electrolytic Capacitor
D1,(D2)__LED(s) (Any type and color)
Q1_____BC560 45V 100mA PNP Transistor
Q2_____BC337 45V 800mA NPN Transistor

Notes:

* Power supply can vary from 2 to 4.5V.
* Add D2 to obtain two LED alternate blinking.
* D1's on-time is shorter than off-time. The opposite regarding D2.
* You can also use D2 only, shorting D1.
* Don't change resistors' values.
* Flashing frequency can be varied changing C1 value from 2.2Î…F to 100Î…F and higher.
* This circuit is very efficient when driving a 3.2V lamp. In this case omit the LEDs and R3, connecting the lamp at Q2's collector and to positive supply, further reducing parts counting.

Source: Electronics Lab

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