Hello Geoff , Grey , Janne , Jam , Andy ,
Ok I have studied the drawings and can see the complementary feedback pair (ztx384/214)with the other two and the 12k and 68r res as a contant current source.
Just to pause there.....
The CFP I have found notes on but the constant current source in that configuration I can't find anything.Can someone fill in the gap please???
There are three 6dB/Octave filters making 18dB/Octave.
At the input and output there are a 10uF cap and 100k Ohm res in a filter looking arangment. Are they??
At the input the two 330k res are a pot div.
What is the 4.7k Ohm/470pF filter for at the input (after the pot div)?????
The neg feedback is not clear to me because it looks like 3 filters in sucsesion but with the middle one not to 0v but as feedback instead it has lost me.
Last bit now the 2.2k res(input)and 10k res(output) before the ztx384 of the CFP. Why.And can Geoff or someone send me the spiced version of the schematics or EWB version Please.
Kieran