This extends my previous question involving same circuit, information replicated here for convenience and independence of this question.

The following circuit schematic:

Has been connected as shown here:

However, on connecting it to the power source (now a 12VDC lead-acid battery, with unloaded terminal voltage as bit over 13VDC, from a robotics kit), I see that only the green LED is glowing (permanently lit), and red LED is unlit. The expected behaviour is both flashing alternately (aka Railroad crossing lights). What all could be wrong here ?

This extends my previous question involving same circuit, information replicated here for convenience and independence of this question.

The following circuit schematic:

Has been connected as shown here:

However, on connecting it to the power source (now a 12VDC lead-acid battery, with unloaded terminal voltage as bit over 13VDC, from a robotics kit), I see that only the green LED is glowing (permanently lit), and red LED is unlit. The expected behaviour is both flashing alternately (aka Railroad crossing lights). What all could be wrong here ?

This extends my previous question involving same circuit, information replicated here for convenience and independence of this question.

The following circuit schematic:

Has been connected as shown here:

However, on connecting it to the power source (now a 12VDC lead-acid battery, with unloaded terminal voltage as bit over 13VDC, from a robotics kit), I see that only the green LED is glowing (permanently lit), and red LED is unlit. The expected behaviour is both flashing alternately (aka Railroad crossing lights). What all could be wrong here ?

This extends my previous question involving same circuit, information replicated here for convenience and independence of this question.

The following circuit schematic:

Has been connected as shown here:

However, on connecting it to the power source (now a 12VDC lead-acid battery, with unloaded terminal voltage as bit over 13VDC, from a robotics kit), I see that only the green LED is glowing (permanently lit), and red LED is unlit. The expected behaviour is both flashing alternately (aka Railroad crossing lights). What all could be wrong here ?