Posted by Marc Martin on
URL: https://www.es-forum.com/Digital-converter-for-t-v-problems-help-appreciated-tp1553564p1553606.html

> Here I was assuming that the external power supply of my troublesome
> laptop was also a switching power supply - but could that actually be
> linear as well?

Laptop power supplies *are* often switching -- what does it say on
the label? If it says something like INPUT: AC 120 - 240 volts 50/60 hz,
then it *is* a switching power supply (because it can handle a very
wide range of input voltage)

Marc