circuit board

Now the retired director of photography is fielding orders for the BlueChirper after teaching himself how to make a circuit board that can emit the annoying sound and flash a blue light.

That includes the light-emitting diodes, the circuit boards and the durable metal housing that protects the lights in news vans and on film sets.

The single most important piece of evidence from the case was a thumbnail-sized fragment of circuit board, found embedded in the neck band of a shirt from the suitcase that held the bomb.

A fragment of circuit board found in the wreckage was identified as part of a Swiss-made bomb timer which had been sold to Libya.

As well as lithium-ion batteries, vapes also contain circuit boards which - if not disposed of properly - can leach toxic compounds such as cobalt and copper into the environment as they degrade.