How to wire a 3AA battery toy to 5v?

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I have wired a few toys that are 2AA batteries to a 5v power supply, no issues.

Curious on how to wire up a 3AA battery toy to a 5v power source?
Any ideas?
 
If you're meaning 3 double A batteries then you should be fine as a single AA is 1.5 volts. So 3 x 1.5 = 4.5 volts. Would think the device should be able to tolerate the extra 1/2 volt.
 
I understand the voltage ratings, what I am wondering is the actual wiring and soldering.

For the 2 double A, diodes are used. However, with the 3 double A batteries, how would one wire it for 2 wires to connect to a 5v power supply and ground?
 
You would wire them in series, pos to neg to pos to neg and so forth, you would have a pos left over and a neg left to connect to your device
 
That's what I was hoping for. Thanks.

Batteries are set up with the middle reversed from the outer ones. So, I should be able to solder + to - on one, then the previous - to the next +, and so on?
 
Like this diagram

aabfd573.jpg
 
You shouldn't need the jumper wire between batteries though. You should just have to hook the positive to the last positive of the battery series and the negative to the last negative of the series. Or are you using some sort of dummy battery or something?
 
simplest way is to take it apart and look for a wire running to the positive end of one of the batteries in the battery compartment. Hook a diode with the band end hooked to that wire. Hook the positive from the +5v supply to the other end of the diode. Hook the ground from the +5v supply to the other wire from the battery compartment - the ground wire should attatch to the negative end of the battery on the opposite end from the battery with the positive lead.
Clear as mud?

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No dummy battery used. Just wired straight to a power supply.

So, no - to + from each battery slot?
Or, just wire from a positive to the 5v and a wire from the negative?
 
simplest way is to take it apart and look for a wire running to the positive end of one of the batteries in the battery compartment. Hook a diode with the band end hooked to that wire. Hook the positive from the +5v supply to the other end of the diode. Hook the ground from the +5v supply to the other wire from the battery compartment - the ground wire should attatch to the negative end of the battery on the opposite end from the battery with the positive lead.
Clear as mud?

That makes a little more sense to me.

Is the diode necessary for this 3 double A set up?
 
most likely not - a diode will drop between .1 and .7v depending on what kind of diode it is.
What kind of toy is it?

Edited my last post to show what i meant.
 
No exact toy yet. Just trying to get some ideas for wiring up a few lighted pinball toys - toppers/playfield toys.

I have done quite a few mods with the 2 double A toys (plasma discs) for MB and CV. I use a 2 diodes inline there for the drop needed to connect to the 5v. However, for the 3 double A toys (still experimenting) I was not sure on the wiring and if the diode is necessary.

Thanks for the help!
 
well, it all depends really. If its sensitive electronics, chances are it'll have a voltage regulator built in. If its a motor and or diodes, i don't think the extra .5v would hurt anything, so really, its probably not necessary.
 
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