I just built the power supply section of the Wave Bubble (ver. 1.0a) and have a problem with the 28v supply section. I am going to use the 5v VCOs, so I did not install any of the 12v boost section. I jumpered C9 to C13, as stated on one of the posts in this forum. The 3.3v section and 5v section work fine but when I soldered in the 28v section, I hear a buzzing sound and my power supply drops down to ~2v (I am supplying 4v). I looked and I think there are no shorts, and I think that all the components are correct. I replaced all of the ICs, and it still continues to not work.
Attached is a picture of the (not working) power supply section.http://w35ktn5.com/WB_Power_Supply.jpg
Does anyone know what the problem could be?