The LM3909 is obsolete.
It charges a capacitor and adds its voltage to the 1.5V battery's voltage then discharges the resulting 3V into the LED in series with a current-limiting resistor.
It won't do anything without the very important outside capacitor.
The LM3909 is obsolete.
It charges a capacitor and adds its voltage to the 1.5V battery's voltage then discharges the resulting 3V into the LED in series with a current-limiting resistor.
It won't do anything without the very important outside capacitor.