In some threads you can find information/discussions on a project i am working on. It is difficult to combine all issues into one thread, so here is another one.
I am currently running a crossover which is build like this:
10K pot-B1 buffer - LP filter(1st) - LP filter (2nd) B1 Buffer - pot - B1 buffer - LP out
10K pot-B1 buffer - HP filter (1st) - HP filter (2nd) B1 buffer - pot - B1 buffer - HP out
The complete setup is balanced so all circuits are double. I am very happy with the results, but i want to add:
1) a Baffle step control and a gain stage to compensate for the loss of the filters which are PLLXO.
2) single ended to balanced conversion
The gain stage can be tubes, but i was thinking of the Bosoz in some form. I read it is suitable for single ended to balanced conversion, but is it realy good? ad how does this work in the circuit? Who has experience with this?
What is the output impedance of the Bosoz, i could use for the shelving filter (baffle step control). This filter is balanced, so it would like something like this:
So R1 would be the output impedance of the Bosoz or another suitable line stage and R2 would be a pot.
An comments on this or advise on a suitable line stage. Would i need the coupling caps of the Bosoz, as i have coupling caps in the last B1 buffer stage of the LP and HP. By the way all B1 buffers have symmetrical PSU's
I am currently running a crossover which is build like this:
10K pot-B1 buffer - LP filter(1st) - LP filter (2nd) B1 Buffer - pot - B1 buffer - LP out
10K pot-B1 buffer - HP filter (1st) - HP filter (2nd) B1 buffer - pot - B1 buffer - HP out
The complete setup is balanced so all circuits are double. I am very happy with the results, but i want to add:
1) a Baffle step control and a gain stage to compensate for the loss of the filters which are PLLXO.
2) single ended to balanced conversion
The gain stage can be tubes, but i was thinking of the Bosoz in some form. I read it is suitable for single ended to balanced conversion, but is it realy good? ad how does this work in the circuit? Who has experience with this?
What is the output impedance of the Bosoz, i could use for the shelving filter (baffle step control). This filter is balanced, so it would like something like this:
An externally hosted image should be here but it was not working when we last tested it.
So R1 would be the output impedance of the Bosoz or another suitable line stage and R2 would be a pot.
An comments on this or advise on a suitable line stage. Would i need the coupling caps of the Bosoz, as i have coupling caps in the last B1 buffer stage of the LP and HP. By the way all B1 buffers have symmetrical PSU's