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What does this circuit symbol mean? [duplicate]

I'm a student who is trying to build a wah pedal for a guitar. I came across this diagram for how to wire the circuit (from this site) : Within the diagram, I am not sure what the following symbol ...
0
votes
3answers
179 views

Multiple different grounds in one diagram

Assume I have multiple electronic circuits and I need to display them working together. Each of them has a common ground symbol. However, the different grounds of the different circuits are not ...
1
vote
2answers
2k views

What does the open circle in the circuit depict?

The open circle at pin 4 in 555 and pin 13 in 4017 has got me confused. I'm new to electronics and any help will be appreciated. Also does the pin 5 in 555 need to be connected to pin 12 in 4017? ...