help surf master PI

[AK48]

hello ! i need your help , my SurfMaster PI came with a big yellow headphone but i dont wanna see this headphone anymore , so i decide to put instead a loud speaker but it didnt work , i put instead an amplified speaker but it didnt do the job to , so i says i must open this yellow headphone to see what inside and i discover i piezo - electric wafer
my question is : how can i adapt electrical levels . on the shematic the signal came directely from transistor SPMA13 throug 12 VDC and go to headphone , good engineer can show me how to do ?
thank you .

[chemelec]

This will allow for a Speaker or Headphones with a reasonable output Volume.

[AK48]

thank you very much Mr chemelec , very nice from you and thanks to all the member
AK48

[reptooyep]

Hi,
I'm not as good as chemelec in electronic but without modifying a lot the circuit, you should get a great sound.. The best is to try.
The MPSA13 can have 0.3A for IC. With a 8ohm speaker (2 Whats) and 100 ohm for R34, you'll have 0.1A for IC and 1.33W (peak power).
Maybe a freewheeling diode would be nice on the speaker to avoid peaks ?

[chemelec]

This will allow for a Speaker or Headphones with a reasonable output Volume.

[ATTACH]37018[/ATTACH]

The Volume Control on this also gives a full range of loudness control.

[AK48]

thanks for all one more time , i'm gonna do the job and see it worked or no , see you soon
best regard
AK48