Hello! Pardon me if this is not the correct sub-forum... 
Is it possible to connect a single source (in this case an 555 oscillator) to multiple analog pins? If so, how?
I'm planning to read the amplitudes of each pulse at random times e.g. every 1, 2, 10 seconds... It'd be great to have some code snippets for guidance.
TY!
Yes just wire the inputs together. But the real point is why you think you need to do this in the first place? I can see no point in it.
As to code it is
value =analogRead(pin);
Just need to simulate or experiment if it is possible; concerned I might damage the board. 
You do realize that all analog inputs are connected to a single ADC, right? You can't read two pins simultaneously.
Pieter
Just need to simulate or experiment if it is possible;
Why, it has no practical use at all.
Rule of thumb, you can always connect inputs together, it's outputs that you need to consider carefully.