I desing on PI a power supply for 28v output 2.85A, with follow results
1.- with blocking diode connected have 5v output (clamping voltage)not work
2.- with diode disconnected have 24v 2.5A pretty close, but working nice
3.- with dimmer (triac)& (no clamping) its flickering and have a loud buzz noise, erratic from 100% to 15% then turn off.
I need a help to see what is going on, a do something to fix the troubles, the most wear is that is working without clamping.
without load reading is 70V ??