Re: TDA2822 ill treatment test! Photo of blown TDA
|
Thanks Arvo.
?Again I wonder whether our friends who had this failure mode , applied any regulated 12V? or using 12V or 12-0-12 secondary? trafo , rectify, filter and use ( a peak if almost 18V- 1 or 2? diodes drop depending on fullwave and bridge.
On Mon, Mar 5, 2018 at 7:34 PM, Arvo KD9HLC via Groups.Io <arvopl@...> wrote: On Mon, Mar 5, 2018 at 05:41 am, Mvs Sarma wrote:
iMHO? the whole issue cropped up as members tried to use mono plug that has grounded the ring connection, thus short curcuiting the coupled Audio, where by the Amplifier started burning.
Hello, Sarma..
There were reports of these WX devices failing spontaneously, without any short circuiting.
The simplest explanation is that hfsignals ordered a batch of TDAs that are not capable of proper behaviour with a 12V supply.? One guess is that the WX TDA chips are intended for 3-5 V.? Maybe none of the normal market for the WX uses 12V anymore.? It does not help that no one can seem to find any datasheet for the exploding version of the TDA.
The fastest way to clear this up is for the hfsignals person who contracted for the WX TDAs to reach out to the seller and get clear definition of what exactly these parts are, and maybe publish a datasheet.
Then people could make an informed decision about what to do with theirs.? Some might decide replacing is the best, others might put a 7805 in line with it, some might try resistors or heatsinks or smaller capacitors.
|
