Re: Micro BitX No Audio TDA2822?
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Hi, i have think if there come some tones to the input of TDA2822 on a frequency we could not hear, 20 KHz or perhaps a lower, with much higher power, than the normal wanted sound. That could burn the TDA2822. Perhaps a LP filter about 2.5 KHz in front of the volume control would be good. Just an idea. 73, Stig, oz8pz
Some of these clones seem to blow for no particular reason.
I think we primarily must limit the supply voltage, not so much the current under load.
Though they are really good at dealing with variations in supply voltage.
The series resistor in the 12v supply could be a solution for a good (non WX)?TDA2822
if you are worried about exceeding the max power dissipation spec at high volume
and low load impedance.
On Thu, Mar 15, 2018 at 07:22 pm, Jerry Gaffke wrote:
Quiescent current into the TDA2822 is around 6ma, peaks can be 1 Amp.
Though?100ma might be sufficient for moderate speaker volumes.
You would need two resistors for a voltage divider, and maybe waste 500 ma through them
to keep the voltage moderately well regulated.
Good spot for an LM7805.
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