PicoMite: driving a small speaker

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Joined: 11/12/2012
Location: United Kingdom
Posts: 8648
Posted: 07:47pm 24 Mar 2023      

  Quote  If you want full SMD, take the active filter (used in Peters Latest GBP25 VGA mite), add a volume control, add PAM83xx or a LM4871, or a LM386(not 5V) and you are done.

What about just adding an emitter follower? I seem to remember way back when this was discussed.

Our signal is approximately 0.1V to 3.1V at max volume which is plenty to drive a small speaker if we can reduce the impedance. The collector could be tied to 5V to give plenty of headroom

Can one of our electronics experts discuss the pros and cons