Why do some toy's circuits miss some components?

So, i opened up some of my old toys just out of curiosity, and i noted that there were some empty places for components such as capacitors. What would happen if i added a capacitor there and why do they lack them in the first place?

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Burf7 years ago
Most likely because the circuit boards are mass produced to fit several different circuit designs. Sort of like General Motors producing a million automobile chassis and then using that same chassis to build Cadillacs, Chevys and Buicks on.
Re-design Burf7 years ago
Best answer. It's easy to make a single board work with one, two or three channels just by adding in parts.
Best answer.
aksuduud (author) 7 years ago
Thanks for the answers everyone.
framistan7 years ago
The company who made it had an afterthought and changed the design. Sometimes to make the toy cheaper or to work better with slightly different components. Rather than scrap out thousands of existing "blank" boards, they add jumper wires to bypass un-necessary components or just eliminate certain components for a no-longer-needed function. Sometimes, some components become un-available such as special integrated circuits or transistors.... so the manufacturer uses a substitute component then sometimes adjacent related components are no longer needed.
gmoon7 years ago
You'll notice this in commercial electronics at all levels--once it hits production, the manufacturer will trim costs by removing or replacing components. Removing 5 cents of components per board results in big $$$$ savings...

Things like decoupling caps, pullup resistors, etc., stuff that should be included, but can sometimes be omitted. There are usually consequences in terms of function, but for toys they often don't care--if it works at all, it's "good enough."

There's a corollary to this--when you see a resistor or capacitor added on the solder side of the board, it usually means that the circuit wasn't working correctly and a "band aid" was applied...