# DIY guitar pedal schematics

I'm trying to build these 2 pedals:

both circuits have these parts separated from the "main" circuit.

When I find symbols such as "+9v", "Vr", "VrefA", "V+" and the likes, does it mean I have to connect the component from the "main" circuit to these kind of "outs" that are pointing upwards on those separated parts? Like this?

What am I missing here?

• Yes. this is the common way to show voltage supplies. Since they are used all over the place they're typically not connected with lines and rather reference with symbols like what you see. Sep 7 '20 at 4:25
• So the +9v on the power supply should be connected to the dc input, right? and the other +9v on the circuit could be connected to the common 9v line I set in my breadboard?
– JMz
Sep 7 '20 at 4:41
• @JMz yes. In short, you connect all the identical-named connections together: All +9V connections go to the common +9V input on your breadboard, all Vr connections go the positive terminal of C5, all ground connections (upside-down triangles with no names) go to the common ground (the negative terminal of the 9VDC input) of the breadboard, etc. Sep 7 '20 at 5:12
• draw lines connecting all of the ground points together ... see how cluttered and unclear the schematic diagram becomes Sep 7 '20 at 6:34

• @JeffreyPhillipsFreeman - have a look at the schematics, they use an external "9V" supply. :) In the Gray, V+ connects to +9V through a 100R resistor. In the Comp, they appear to have missed the connection from +9V to +V, but just connect. For this sort of application, 9V is nominal, not precise. Sep 7 '20 at 8:29