A closer look at the AF108 bi-polar drive circuit

[dbanner]

I look back at my old posts and wonder what the hell was I thinking. Ha.

The relationship between number of turns and inductance is non linear. So halving the number of turns does not halve the inductance. In fact you end up with much less than half. The formulae proves this( and also the coil calculator).

However for a bifilar wound coil, I suspect that the overall inductance might be ever so slightly higher for the same number of turns due to the sequential side by side laying of the turns next to each other. Don't know if it would make any difference, but in the case of a centre tapped coil, a bifilar wound coil would make both halves extremely similar and achieve a better symmetrical balance.

[6666]

dbanner thanks for your post, it reminded me of something I had forgotten to read, cheers.

[GeoMax]

Hi,
the last post to this thread is quite a while ago. But maybe someone can remember.

Question:
1) How is the headset connected to the audio circuit? (see schematic page 1, post #1) There are two external sockets labeld with "Audio Socket" in the diagram.
Audio Socket "A" and Audio Socket "B" & "C".
2) What is the coil induction of one site of the bifilar coil?

dbanner
What is the last progress on the AF-108 project? Have you acomplished it?

[Carl-NC]

180uH per side (also posted in your other thread)

[GeoMax]

Hi Carl,

thanks for the information.