0 1.5V LED Flasher using Transistor

Another LED flasher, but this time powered only by 1.5V (take note that the minimum voltage to light up LED is 1.8V or higher). Q1 and Q2 will start to generate pulses that charge the C2. When C2 is charged, the voltage across the LED is around 1.5V plus the charge in the capacitor. This voltage is enough to light up the LED.

2N4403 pins

2N2222, 9013 pins

Part List:

R1 - 1.2 Mega ohms 1/4W

R2 - 1.2 kilo ohms 1/4W

R3, R4 - 390 ohms 1/4W

Q1, Q3 - 2N2222 or CS9013 NPN transistor

Q2  - 2N4403 or  similar PNP transistor

C1 - 1uF electrolytic capacitor

C2 - 220uF electrolytic capacitor

LED - red (see LED pinout or LED info)

Other LED Flasher Circuit:

Two transistor Flasher - two LEDs flasher

Flasher by 555 - bright flasher uses 20 or more LEDs

Fading LED - fading effect of two LED