
2. Replacement based on an LM317 regulator

3. DC Power Jack installed in the SoundBridge back panel

4. External Plug-pack

However I would suggest that ALL the electrolytics should be replaced.
Also upgrade the diode to a 3A 60V device.
FrankB wrote:I hope that's not 15V only, you have a stepped down voltage for the digital circuit? Otherwise you'll probably be out a radio again soon.
Frank
Iris wrote:...I seem to recall before the unit failed that there was a very slight hum when not in standby and no music playing and it was there with the 12v and also with the 15v - just more so but not annoying. Could this be due to the amperage of these PSU's? Anybody else noticed this? I also noticed that it seems to be coming from the woofer - maybe its defective???
Djeici wrote:Hello everybody !
I’m one more victim of the poor quality of the Soundbridge radio PSU.
I’ve read with a great interest this whole topic and I’ve already opened my Soudbridge and realized how burnt the previous capacitor was.
After some searches, I think I’ve found a PSU to replace the dead one and it may interest some other people : http://www1.conrad-uk.com/scripts/wgate/zcop_uk/~flN0YXRlPTMzNTIxNzg2ODY=?~template=PCAT_suchergebnis&p_searchstring=514292&p_back_template=&zhmmh_area_kz=62&sp_insert_kz=62&s_haupt_kategorie=&p_page_to_display=DirektSearch&p_load_area=$ROOT&p_artikelbilder_mode=&p_sortopt=&page=&p_catalog_max_results=20#
- Could somebody please confirm that the technical data is OK ? (output current : 1.7 A ; power 20.4 VA => 12 V DC)
- I also wonder whether it will fit in the Soundbridge ((W x H x D) 50 x 51 x 64 mm) ? (maybe it would be OK without the brackets ?)
- It seems to have only one output whereas I need 2 (one for the screen and one for the speakers) ?
Thank you for your answers !
Djeici
billd wrote:Iris wrote:...I seem to recall before the unit failed that there was a very slight hum when not in standby and no music playing and it was there with the 12v and also with the 15v - just more so but not annoying. Could this be due to the amperage of these PSU's? Anybody else noticed this? I also noticed that it seems to be coming from the woofer - maybe its defective???
Iris, my first external P/S build I got a strong hum. That was with a 12V transformer-based plug-pack. I swapped to a 13V switching-based plug-pack and the hum went away. It's now silent.
I never isolated the cause. I suspect the plug-pack was the cause - unusually it was specified for 50Hz supply only and I was running on a 60Hz supply. However it might have been the way I packed the recitfier circuit and cabling back into the speaker box (unlikely to be the cause as it's all DC) or due to not using a choke on the incoming 12V supply. The max current on the humming 12V supply was also only 1amp which is marginal.