PicoMite: driving a passive buzzer

Author	Message
thwill Guru Joined: 16/09/2019 Location: United Kingdom Posts: 4382	Posted: 04:24pm 16 Dec 2022         Mixtel90 said   PAM8403 stereo amplifier modules on ebay. Will run from 2V5 to 6V. 4R or more speakers. No good for headphones as they have bridged outputs. 1.90UKP. These are class D and bridged so will probably give plenty of output (about 0.5W per channel at full volume, about 85% efficiency) for what you want. Quite capable of driving proper speakers if you wanted to. You should put either the simple RC filter from the manual or, much better, Volhout's filter before this. The version with the volume control might be a good idea as 0.5W can be surprisingly loud! Ah, through looking at eBay and Aliexpress listings I had persuaded myself that PAM8403 required 5V and thus I couldn't use it without also adding a buck-boost converter hence investing in the more expensive module. I ordered some nice little pot's to use for volume control (https://www.aliexpress.com/item/32990973515.html), but alas none of this arrives until after Christmas, so I will have to find some other way to amuse myself in the meantime. Best wishes, Tom Edited 2022-12-17 02:30 by thwill