The “two flashing led” circuit is designed for 9 Volts but it works at lower voltages too. In this design we used red leds but by changing the series resistors R1 and R4 you can also use different LED ...

This is what makes the UJT useful, especially in simple oscillator circuits. Working of Mock Flasher LED. UJT 2N 2646 is used as a simple oscillator with the oscillating components R1 and C2. The LED ...

In Figure 1, National Semiconductor's LM3710, a supervisory circuit, is configured to reduce the power consumption of a traditional LED indicator by 99%. When V IN is above 4.4 V, green LED1 ...

for the simple flasher, pin 1 and 8 should be connected together as well, LED (polarity is important here as well) between 8 (cathode) and 6 (anode), or if using an incandescent, it goes between ...