Author Topic: Why does my earphone get so hot???  (Read 630 times)

kaalingomes

Why does my earphone get so hot???
« on: April 24, 2020, 12:35:27 PM »
Recently I am building a circuit to drive loudspeaker and earphone.

The circuit was the same as the reference design (Fig. 1 of Page 4) of datasheet.

It works fine with 8 ohm loudspeaker but makes earphone hot if I replace loudspeaker with small earphone.

Is the output power of TDA2822M too big for small earphones?
Is it possible to fix this situation by modifying the circuit?

Thanks for your help!

Digital Larry

Re: Why does my earphone get so hot???
« Reply #1 on: April 24, 2020, 12:44:44 PM »
You probably need a capacitor to block DC.
Digital Larry
DSP tinkerer and former transistor twister

Digital Larry

Re: Why does my earphone get so hot???
« Reply #2 on: April 30, 2020, 02:13:44 PM »
Another possibility I guess is high frequency oscillation.
Digital Larry
DSP tinkerer and former transistor twister

GGBB

Re: Why does my earphone get so hot???
« Reply #3 on: May 28, 2020, 01:27:22 PM »

PlasticSiren

Re: Why does my earphone get so hot???
« Reply #4 on: October 22, 2020, 06:36:10 AM »
mcdvoice

Thanks for this. This worked exactly as expected.