Output component of an electronic gong

Hello, I’m ordering components for an electronic gong. I just wondered what the output component of this schematic could be? It’s the circled component with a blue line. Thanks in advance.

It is just a generic pin to some output connector.

Compare it with the “Zero” and the “Plus” (12…15V 20mA)

The 100kOhm potentiometer suggests it is a pretty high impedance audio output, and yo will need some amplifier and a speaker to get noise out of it.

741 is also a pretty old opamp, but probably any opamp will work. I would use some opamp that can run on lower voltage. I think the 555 also works from a voltage as low as 5V.

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