How to hook up multiple components to one 9v battery

[BetterOffShred]

The negative leg of each cap goes to the ground rail, the 9v battery negativr leg and all the negative power line from each component goes to the same ground rail. You have only one ground strip. All grounds connect to it.

Just like the huminator

[crochambeau]

All grounds should connect and form up one universal ground which includes your enclosure if it's metal.

But yeah, this really is choose your own adventure.

I would recommend hooking the circuits up one at a time, so you don't bury a simple mistake under several layers of process making troubleshooting even more difficult.

Mistakes are going to be made, they are the best education, have fun with it!

[eatyourguitar]

if you connect a toy that runs on a single AA battery 1.5v then your 9v battery could kill it with over voltage. two AA batteries is 1.5v + 1.5v = 3v. if you know the current consumption exactly, you can just use a current limiting resistor to control the voltage drop without the bottom shunt you would normally have in a voltage divider. the logical next step with toys is to replace the clock with something you can slow down on a knob. there are lots of tutorials for circuit bending toys by switching out the clock for a 555 or 40106