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Will 19V work on 12V?
A 12V adapter is unlikely to damage the components, but it is possible depending on the design and that’s why I mentioned it. The likelihood is probably vey tiny though so you can probably ignore that bit.
Can I use a 16v power supply on a 12V?
You could use a 12 volt voltage regulator so that the motor gets the required voltage level instead of the 16v. You should put a meter up to the supply to see what voltage it really is throwing out. Obviously, you have seen that the 16v supply doesn’t work with the 12v motor.
Is it safe to use a 19V DC adapter?
If the adapter says 19V, does that mean that it can provide “up to” 19V safely or will it always provide 19V and damage the TV? No, don’t use it! The PSU will supply 19V (“voltage source”) and will probably damage the load.
Can a 19 volt charger be connected to a 12 volt device?
If that “12V” device was designed to be used in cars/boats, from the nominally 12V supply that’s around 14V when the engine is running, and might carry transients up to 200V, then it must be able to tolerate 19V. At least for a short time. Other devices are less tolerant.
Is it safe to use a 35W DC adapter?
Most devices are designed for a specific operating voltage and sink current respective to their task. E.g. in standby mode your TV will sink a low current, but when the display is on, it will need much more. The power spec “35W” just says, how much power it can provide, but at a higher voltage the load most probably will sink more current.
Is it okay to use a power supply that provides slightly more voltage?
This doesn’t mean your device will consume 3.42 A when its powered with this adapter; it is only an indication of the maximum current that can be drawn through the adapter by any device that it is connected to, above which the adapter gets damaged. Any device will only draw as much current as it needs, so long as its power source can supply it.