Dear All, First of all I wish to thank all those who sent in material for the LF book and also for those who have given permission for me to use material from their websites. It is interesting that w
Most LF PA designs employ FETs in class D push-pull, with the output taken via a transformer. A Pi section filter is then used to remove the harmonics. The documentation on the Decca transmitter mod
I'm not sure that I would agree a single-ended push-pull output is significantly easier to bias; linear biasing of "floating" transistors is done all the time in audio power amplifers, such as are fr
Referring to John KD4IDY's note - I cannot help but feel a bit uneasy about the use of class D amplifiers followed by conventional shunt C series L pi-section filters - although the designs using the
Screw that AOL!!! John, these damn fool people out to prove that the silliest error on the part of the "subscriber" is the guy that is paying the bill. I have learned to hate that fool outfit. Us "no
Well Said!!!!!!! Bill Screw that AOL!!! John, these damn fool people out to prove that the silliest error on the part of the "subscriber" is the guy that is paying the bill. I have learned to hate th
I also experimented with a bridge circuit (a modification of a surplus SMPS, but not using rectified mains). I had a "blow up" and it took out all four MOSFETs. In earlier days for LF transmitting I
