DINAS Midrange Speaker Noise
I have happily completed my new DINAS. I used Mahogany for the front baffle and the rear and baltic birch ply for the sides and top. I am a little unhappy with the small noise that seems to be coming from the plate amp. It is a high pitched oscillating wining. When I move the power connector connected to the amp I can affect the sound. The power supplies were purchased on Amazon and were the recommended ones from the plans. I am thinking about soldering the power to the amp board to eliminate the connection at the rear of the speaker. Any thoughts about the noise would be appreciated.
Something doesn't sound right. I wonder if the power supply manufacturer changed the end. Can you look to see if they sent you a 2.5 by 5.5 mm end or 2.1 by 5.5 mm end? If they change the end, that would create a loose connection. the noise could be caused by that, or it could be something separate. But let's do one thing at a time.
I have no way to accurately measure the connector end except to say that I accurately measured the outside diameter of the barrel and it is 5.5 mm exactly. I did try another power supply (with lower voltage) and it seemed to fit the same way, loosely. It too made the suspicious noise. I think tonight I'll check to see if I have any different barrel connectors that fit better and see if they make any difference. Ultimately, if it is only the loose connection causing the problem, I will simply solder the power supply directly to the amp board. Thanks for your consideration.
I can't say if that is causing the sound. That definitely is not normal. However, I would replace the power supply. It looks like they ended up switching it to a 2.5mm. That is the internal dimension, which makes a loose connection. I would send them back and replace them with these: https://amzn.to/37YlTHB I'll go ahead and update the plans. Thanks
Thanks for updating the plans. I noticed someone else that had a similar issue. I already ordered a different slightly more powerful (and more expensive) power supply from Parts Express.