[sdiy] TB-303 humming noise problem

[Tom Wiltshire]

Didn't you quote Robin Whittle in an earlier mail saying that it was a ground loop problem and that adding an extra earth wire helped? Have you tried that?

Alternatively, reduce the LED current as much as possible. Use high efficiency or low power LEDs, and change the resistors to run them dim. That ought to reduce the multiplexing noise a bit.

HTH,
Tom


On 11 Feb 2013, at 14:41, cheater cheater <cheater00 at gmail.com> wrote:

> Hi Richie,
> I don't really mind the white noise, but the buzzing is pretty bad.
> How can I mod the TB-303 to lower the level? Do you think any digital
> parts need bypassing?
> 
> Thanks,
> D.