The first current feedback amplifier I made! Hopefully I'll have the time to build it in real life and test it. It looks pretty legit :) I'll use1st 4 transistors 2N3904/3906 current mirrors BD139/140 pre-drivers A1046/D2058 drivers TIP/41c/42c Outputs TIP35c/36c don't know if it will work. UPDATE I builded the amp it works! How ever when you plug in the amp for a second it pulls 200-300mA and then suddenly drops and goes in class B mode. I'm assuming it needs biasing or other transistors that fit also the d2058 & A1046 pre-drivers do get worm so plan a heatsink for them. UPDATE I'm stupid, when the amp gets worn the distortion goes away. The amp doesn't get hot witch is weird considering I have a small heatsink. Btw if you are considering 4700uf filter caps on the power supply don't otherwise you get a bit of hum try With 6800/10000uf caps. I'm testing it with a 2x27.7V power supply and the transformer is in series with a 100W lightbulb. UPDATE NOPE the distortion comes when the volume is a bit above the pre driver region. At low volume barely hearable you get clean sound a bit upper and you get class B distortion and above to max it's gone. UPDATE again Screw 2n3904/6 they will overheat BD139/140 will be the deff amp as well. LAST UPDATE through the hole project I was an idiot I finally fixed it, It's far from perfect but at least it works! oh and sorry for bad grammar you know just in case if the grammar natzies come. Have a nice build cheers ;) Btw I added 4 output transistors for 180W 2 channels will run from a 550VA Transformer 2X36V AC filtering caps for 2 channels will be 3X 4700uf 63V or 6800uf per rail if you have hum. Biasing transistor on output transistors heatsink. I added it because there was thermal drifting.
