Noise via headphones, solution, other updates :) Aug 27, 2023 16:09:59 GMT robertlanger, MikMo, and 2 more like this
Post by dizzeesatchel on Aug 27, 2023 16:09:59 GMT
A couple of people have noted that AEuroPi can introduce a pretty loud background noise under some circumstances, especially when using the HP AMP module or the headphone output built into POWER
My poor understanding of power filtering is to blame here, but it should be fairly straightforward to alleviate in future designs. In the meantime if you're handy with a soldering iron you can greatly reduce the background noise with a few components:
- 10ohm resistor
- electrolytic capacitor rated for at least 10v & 100uf, a greater uf value would probably be even more effective
- short bit of shielded wire
- solder, and desoldering braid or a solder sucker
Desolder the top end of the diode (the end with the stripe) and lift that end out of the PCB
Solder the now-exposed end of the diode to one end of the resistor, and put the other end of the resistor through the hole where the diode was removed
Take your capacitor and place the positive leg (the longer one) through the same hole as the resistor. Then solder them both into place.
Solder one end of a strip of wire to the negative (short) leg of the capacitor, and carefully solder the other end to one of the ground pins coming through from the bus cable (take care to avoid the 5v pins which are immediately above)
You'll need to bend the capacitor over to lie flat so it fits under the front panel. Double check nothing is making contact with any of the other components. I taped things into place with kapton tape as an extra precaution.
Here's a little diagram and some photos of the finished arrangement
There's still some audible noise on the menu screen (funny that, Ornament & Crime is also noisiest when using the menu) but it's WAY improved, and with a script running it's close to noiseless on my headphones.
As for whats coming up, i have a handful of boards from a test of the most recent version, so i may manually install the power fix on these and make them available as B-stock. Then hopefully another larger run, if desired
The new versions are nice if you like blinkenlights...