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21 minutes ago, Domas_J said:

Does it matter if I have:

1. AC (220v) go to 18v DC

or

2. AC (110v) go to 18v DC

Can your converter handle that kind of load?

NOTE: I no longer frequent this site. If you really need help, PM/DM me and my e.mail will alert me. 

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Where it is important is if it is a transformer and you mess it up.

 

Think power supplies that have the switch between 110 and 220.

 

Say if you have a device that has a transformer and internally it has a 110VAC - 55VAC stepdown transformer that then goes into a linear power supply, ratio is 2:1.

 

If you by mistake plugged said device into 220VAC, the secondary would be 110VAC due to the 2:1 ratio and likely destroy the power supply.

 

Same goes for transformer based linear power supplies and plugpack.

 

Now that is far less common these days as many devices use Switch Mode Power supplies that have a wide input voltage range say 80-260VAC so can work around the world with different plugs/leads and often in brownout conditions.

 

This is a long answer to say it depends. Your question isn't exactly clear on what you're doing.

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