# What is the schematic components that I have circle in the image below?

#### Abu Bakar Moin

Joined Sep 14, 2021
2

#### jiggermole

Joined Jul 29, 2016
47
photodiode. It generates a voltage based on the intensity of light striking it.
https://en.wikipedia.org/wiki/Photodiode

if the arrows on the diode were pointing away from the diode it would be an LED

and the lower one is a Bipolar Junction Transistor. looks like an NPN (not pointing in) as opposed to a PNP (pointing in).