That's what my one looks like in my
initial batch uBITx.???? It would be interesting to see photos of
those that have had "the smoke come out".
This is the page that links from FCI to the datasheet:?
And this shows a maximum voltage of 15v.
Mike ZL1AXG
On 2/03/18 5:38 PM, Raj vu2zap wrote:
At 02-03-2018, you wrote:
Raj,
Good information, that 800ma when shorted.
There is likely a surge that is considerably higher while it
charges the
cap if you power up the rig
first with no headphones or speaker, then plug in a dead short.
Only there for maybe a couple milliseconds, so would need to use
a scope
to see it
as a voltage across perhaps 0.1 ohm resistor that is in series
with power
to the chip.
Was that the stock TDA2822M that came with the uBitx?
Mine has a logo of "FCI" or maybe it's "FOI", where
the middle character is filled in to where it is an almost solid
circle.
It also says "PI1" and then below it says
"TDA2822M".
I have no idea who makes that.
Post 43211 says there's some really bad clones masquerading as
TDA2822M's.
There seems to be at least a half dozen different manufacturers
of
TDA2822 variants.
So any testing had best fully describe manufacturer and markings
and
such.
Tayda claims to have some? ST/SGS-Thomson TDA2822M's and
TDA2822L's
at cheap prices:
???
When you click through to the datasheets, you get either a 1995
ST
datasheet (for the TDA2822M)
or a UTC datasheet (for the TDA2822L)??? The "L"
just means lead free.
A google search for TDA2822M finds this ST datasheet first,
dated 2003
and marked "Obsolete":???
?
I suspect the Tayda parts are not really ST.
Yes, bridge mode would be nice for driving an internal speaker.
But not for driving anything external, were everyone would
assume the
jack shell is at ground potential.
Jerry
On Thu, Mar 1, 2018 at 07:22 pm, Raj vu2zap wrote:
- Did some more tests.
- Normal audio use the current was 60-70mA
- Dead short with varied drive the current was 300-800mA. At
800mA the
chip got hot!
- The current did not go above 1A at any time.
- I suspect there are TDA2822Ds masquerading as TDA2822M.
- Raj
- . . .
