There are clearly a few items of ebay electronics about which some fear, uncertainty and doubt is in order.
For example, good luck getting 20 AH at 12v out of this:
? ?
Or getting the maximum rated amps out of any $2 switching (or linear) power supply
across the entire claimed input and output voltage ranges. ?Or even half of the rated amps.
For more than a few milliseconds.
Ebay RD16HHF1 RF power FET's are often some random switcher FET with fresh ink.
That can even happen with the relatively cheap IRF510, why anybody would bother is beyond me.
But many have had surprisingly good luck with the $3 Nano's.
Including most Bitx40 owners.
Though they must be cutting corners where they can off the design of the $30 original.
?
And I did just order 50pcs of the AD8307 for less than I could get two out of Mouser
as per the last paragraph of this post: ?
/g/BITX20/message/32675Got my fingers crossed.
Jerry
On Sun, Oct 22, 2017 at 02:40 pm, Arv Evans wrote:
Regardless of what has been said about the on-board regulator being questionable, it is a pretty
standard 3-terminal regulator it is usually good for at least 100 ma.? I have used a couple dozen
of the Asian manufactured NANO boards with +13.6 volts input and they all worked just fine.??
I suspect that your concern about exceeding current limits may be valid though because there is
no heat sink on those on-board regulators.? Most of my Arduino based test equipment uses the
on-board regulator for NANO and an attached LCD.? Other circuitry is powered from a 7805L or
higher current capable 7805 equivalent.?
There is a lot of not-invented-here and not-manufactured-here sentiment among the ham radio
fraternity.? Some of it justified and some is just myth and FUD (Fear, Uncertainty, and Doubt).
