11-02-2024, 05:00 PM
Hi Guys!!
I'm kind of working with Rich on this, throwing out ideas.
I thought the manufacturer said ti try installing a 10,000uf cap, that is only making the DC more pure and ripple free. It is not addressing the square wave generator chip.
I ear matched his tone of the vibrator noise through an online generator. I think the noise is right at 230Hz https://www.szynalski.com/tone-generator/
Set the generator to 230Hz and the waveform to square wave. Sounds very close, I can't have both running to zero beat the freq.
So one thought was to add a low pass L/C filter across the speaker, to null out that whine. Or maybe not. The sound is only heard with the control all the way down. Too bad there's not a way to cut the audio right at the bottom of the control>
The car owner may not mind, but I think we like to have it so they don;t hear some weird whine like an unshielded alternator.
Take care! Gary Maker
I'm kind of working with Rich on this, throwing out ideas.
I thought the manufacturer said ti try installing a 10,000uf cap, that is only making the DC more pure and ripple free. It is not addressing the square wave generator chip.
I ear matched his tone of the vibrator noise through an online generator. I think the noise is right at 230Hz https://www.szynalski.com/tone-generator/
Set the generator to 230Hz and the waveform to square wave. Sounds very close, I can't have both running to zero beat the freq.
So one thought was to add a low pass L/C filter across the speaker, to null out that whine. Or maybe not. The sound is only heard with the control all the way down. Too bad there's not a way to cut the audio right at the bottom of the control>
The car owner may not mind, but I think we like to have it so they don;t hear some weird whine like an unshielded alternator.
Take care! Gary Maker
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
