spec sheet audio chip

I have build this circuit succesfully but I need more volume. This is an audio chip with animal sounds.

I tried to remove the transistor and connect the out pin to a class d amplifier breakout. I get only a very low volume then.

My idea is to amplify the sound first with the S8050 transistor, and then connect to the amplifier. When I remove the speaker from the circuit from the spec sheet I need to replace that with a load resistor. I have however no idea which value to pick. The output will then be between the load resistor and the transistor (right?)

I use a 8 ohm speaker.

  • \$\begingroup\$ Hard to tell for sure without reading the datasheet carefully, but I think you are correct about the basic idea. I suggest using an 8 Ohm resistor to start with. If you use a differential input class D amplifier, you could possibly take your output from directly across the resistor. \$\endgroup\$
    – user57037
    Feb 22, 2017 at 16:46
  • 1
    \$\begingroup\$ I decided to go for the solution below because i could omit the transistor and the volume is high enough. \$\endgroup\$
    – het.oosten
    Feb 22, 2017 at 20:39

1 Answer 1


A little bit of googling would have found this circuit

enter image description here

Nothing special about the audio amp used (HT82V793) so just about any audio amp should do.

  • \$\begingroup\$ Thank you i didn't found this circuit. I have a lot of hq noise now. \$\endgroup\$
    – het.oosten
    Feb 22, 2017 at 20:37

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