# Alternate to LM386 for 3.3V system

I'm trying control the volume of a small speaker (8Ω, 1/4W) in a 3.3V system using a potentiometer wheel (10kΩ). I've done this in the past using an LM386 in 5V systems, but the project I'm working on is 3.3V only. I've been browsing Digi-Key for a 3.3V equivalent, but of the ones I've looked at so far (LM4864, LM4862, TPA301, TS34119), I can't seem to understand how to control the volume in their typical application diagrams (with a pot or otherwise).

Does anyone have experience with something like this?

• AT 3.3v you may want a modern class D amp intended for mobile devices, and you'll want one that can drive both sides of the speaker. – Chris Stratton Jun 29 '18 at 4:46
• What do you mean by both sides of the speaker, like left and right channels? – MyFingerHertz Jun 29 '18 at 11:31
• I think he means a BTL (bridge tied load) driver. It drives one side of the speaker with a signal, and the other side with an inverted copy of the signal. Eliminates coupling caps and provides 6dB higher output from the same supply voltage. – Cristobol Polychronopolis Jun 29 '18 at 11:54

for TPA301 $R_F$ is the volume control