Of interest to Class-D amp scratch builders

[FastEddy]

I spotted this Dallas Semi. / Maxim ad in a trade journal and was wondering if anyone has actually tried using Ferrite Beads or Lugs on the outputs instead of large coils or inductors ...?

Note the use on Page 15 of this pdf file: http://www.maxim-ic.com/cgi-bin/dg?dg=FLAT_PANEL_DISPLAYS

 

[mzzj]

I Ferrite Beads or Lugs on the outputs instead of large coils or inductors ...?

Does'nt work with "normal" class-d amplifiers, inductance values required are several decades bigger. (and thus size) Maxim's solution drives loudspeaker with raw pwm signal and ferrite beads are there only to filter out RF-trash(something like 10MHz and upwards)

 

[FastEddy]

" ... I sorta stopped because I began wondering if it was worth my effort and expense, when for not much money I could buy a better outboard dac, and use that. ..."

Thought it might be something like that = a simpler solution that may or may not be better. I also was aware that this would apply to Dallas / Maxim ONLY Class D amps ... so far.

Any thoughts on improvements to this scenario ... or is it the wrong road to take??



"When you get to a fork in the road, take it!" - Yoga Berra

 

[Pano]

This has been discussed some before, scattered across several threads.

I think this could be done with many H-Bridge class-d, as long as the speaker leads are very short - or maybe shielded.

The question (apart from RFI) is what will the driver load do to the switching transistors? It something I been wanting to test with horn compression drivers.