It seems I'm in over my head again. I'm having difficulty getting my newly built W1VD kW 137 amp to run correctly. I think the problem may be with my driver board. Question 1: Could anyone with a kno
Paul, also had problems with the W1VD driver circuit (MF version). The solution for me was to earth all the unused pins of the 74F74. I can send you the input levels later if needed (not available no
The 74F74 is an edge-triggered flip-flop. so the correct input for the main board is a square wave at TTL voltage levels, with fast rise and fall times, but with a current requirement greater than TT
Paul, I may have missed some of the previous posts, but here's my $0.02 worth. When I built my first version of the amp, I set the X2 option on the U3S and drove the amp directly from the CLK output
Paul In addition to Ward's comments ... To be more consistent with the original design (to avoid the "I built it just like ... except" syndrome) move the driver board close to the FETs to shorten the
Jay, Thanks for the detailed response! See below, threaded in. Done, verified that it looks OK with scope. (Previously I had not been testing with the DC offset!) I've reduced drain voltage to 13V
Done, verified that it looks OK with scope. (Previously I had not been testing with the DC offset!) I've reduced drain voltage to 13V so that I can do that. I have no dummy load which can handle
Paul Pressed for time so just a quick response. Notice the small 'bobble' (around 3 volts) on the gate waveform on the way up ... that's where the FET is turning on. Turn off is about the same level
Jay, That comment about the 'bobble' is one of the most interesting and useful bits I've read in a long time! I have to run too. I will apply 13V, check drain waveforms under these same drive conditi
