Sibelius a new amp


Junior Member


Junior Member
It is only 35W/ch @ 8R,70W @ 4R 140W @ 2R
It is being made for the Belgium Market and then later available world wide.
It runs about 20W push pull Class A.
It has RCA and Balance inputs,
It BW is 10Hz - 300KHz
It has a single transformer but twin bridge a each channel will have 100,000uF of caps,

It will made to go with these speaker oh watch the video Harley is good at chat,

Single Driver Speakers | Full Range Loudspeakers | Full Range Speakers for Sale


Junior Member
PCB now assembled.

Top left PCB convert Balance to un-Balance,Top right PCB is the twin bridge PSU with 88,000uF Caps and the 12V supply for the Balance PCB and the ON LED drive. The bottom two PCB's are the power Amp, they will be running 35W P-P Class A.
NOTE:- The balance PCB can have a variable gain control not used in this project.
Running the PCB on +20 and _20VDC will allow with larger heat sink a deeper current and more Class A, also note the DC offset can be adjusted to less than 1mV, max current is 12A continuous and 1mS peak current can be over 100Amps. Then the fuse blows.

Great fun on a lock down day.