My new zBitX bought at FDIM has no audible noise from the internal speaker but I really like an external powered speaker. I use a Drok voltage/current controller and I hear no noise from that either. Happy camper.?
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On May 20, 2025, at 8:36?PM, Grant Brown via groups.io <grant.brown73@...> wrote:
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I think the speaker power amplifier must be really sensitive - the headphones seem immune to a lot of (if not all) the noise, and the speaker can be pretty noisy even at volume zero. I was messing with some buck-boost converters today to see if I can use this with my regular (read: larger) batteries, but they're WAY noisier than the 18650s... in the speaker. Didn't notice a difference on headphones.
Tried adding some toroids to the cable, which helped a tiny bit, but not a ton and it would add a lot of weight.
I'm half tempted to just cut or put a switch on the speaker cable, but I'm interested if there are any cleaner solutions.
Playing around with it a bit tonight - seems that a bit of shielding between the pi and the board may help, especially with some of the noises. I'm getting screen update noise and a periodic crunchy noise, and the latter was most obviously affected.
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I just received mine last night, but your video is the same as what mine is doing. I'll have to play around with some shielding of the pi. Thanks!
David Wilcox K8WPE