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Cheaper transistors should totally work, as I tried to describe in the article.

I had this particular MOSFET lying around from a different project, so that’s the main reason I chose that one :)

It’s also only $0.46 in singles at DigiKey, so hardly something crazy wasteful in any event.

A no-thrills transistor would be some 2 cents, so 20 times cheaper on the other hand.

I wasn’t able to locate any suitable BJTs around $0.02 in single qty at DigiKey.