Schematic reading

[Jmilla]

Really dumb question but when reading schematics and there are 2 separate circuits on the page ala the Timmy schematic how do you integrate the two? Not trying to build anything but trying learn schematic reading for my own education.

[jimilee]

I'm not looking at it right now, but is one power and the other audio?


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[sonnyboy27]

If you look at both blocks you'll see a couple of tags (usually +9V and Vref). Those are places where the blocks connect. It's used to help clean up your schematic rather than showing all of the wires running around to all the Vref points and +9V points.

[Jmilla]

In Brian's schematic it shows ground and +9V which make sense to me, but then there is VB+ and in other schematics I have seen for other projects have VREF. Again another dumb question but what is VB+ and VREF?

[Jmilla]

The other thing I do not understand is the gab in the separate segment with labeled 4 and 8 and no component in between.

[sonnyboy27]

VB+ and Vref are both the same thing. They represent a different voltage level (usually 4.5V) that's created by a voltage divider.

The section marked Pins 4 and 8 are power (pin and ground (pin 4) for the IC.