What were the marking on those chips that the club was blowing up?
Anything reputable seems to work fine at 12v so long as you don't abuse it
with excessive power out.? Though reducing the supply voltage to 5v
is probably a good idea, as that would make it very difficult to exceed
the 1 Watt dissipation rating at high incoming signal levels.
The UT-Source webpage has only a datasheet link for the ST DIP,
which ST hasn't manufactured for several years now.
The product photos show an old ST part, also something with an "HL" brand mark.
At $0.37, I sincerely doubt they are selling new old stock from ST.
Could be that the HL part works fine, we won't know till somebody gets some experience with it.
But if that's the part that your club was buying, then I'd definitely steer clear.
Anybody have any idea who HL is?? ?Have a datasheet?
Since my time is worth more than $1 per day, I'd probably spend a buck on a suitable part
from Mouser, one that has a well defined manufacturer.? A manufacturer with the resources
to have an intern scrape up a copy of the ST datasheet, substituting their logo at the top.
Jerry
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On Wed, Mar 7, 2018 at 02:46 am, G1KQH wrote:
Greetings
UT Source is showing high stocks (34000) of TD2822M
We still think based on the finding of the GQRP club if using this chip it is better to drop the volts down to 5V using a regulator.
73 Steve? G1KQH
