Hi, I am trying to finish my two mono HackerNAPs but one of them shows DC offset at around 60mV on its output while the other is 20mV.
I thought the offset is coming from different hfe's combinations between TR7&9 and TR8&10 and today I swapped the places of TR9 and TR10 leaving T7&8 as they were. Doing this I expected a little change in the output offset but to my surprise it didn't move at all.
So, what causes this offset and how I can reduce it a bit, please?
Thank you!
Ivo
I thought the offset is coming from different hfe's combinations between TR7&9 and TR8&10 and today I swapped the places of TR9 and TR10 leaving T7&8 as they were. Doing this I expected a little change in the output offset but to my surprise it didn't move at all.
So, what causes this offset and how I can reduce it a bit, please?
Thank you!
Ivo