Hello LF'ers, In the hope it may help or be of interest my experiments with containing the level of spikes seen at the end of a TX on the drains of push pull FET's has shown that the conventional, wi
Hi Chris, Which type of FETs are you using? The IRFP460A for example has a built in Z-diode which seems to handle the spikes. Anyway i put a 150 Ohm / 220 pF (for LF) series RC paralell to the Drain-
28th May 2017 Hi Stefan, remarkable work on VLF, congratulations!! I see these with all FET's but I acquired very cheaply some Wolfspeed FETs with a lot of overhead. These spikes sometimes kill lesse
Hello Chris, These FETs are a good choice :-) You still manage to make them dead? And your supply voltage is 50V? That's not ideal. You can use 320 V directly from the mains, no heavy transformer nee
Hello Stefan, 28 April 2017 They go bang when run as 2 amps in parallel with the W1VD combiner. They then even blow the Varistors to kingdom come. I will try with the combiner into my big water coole
Hello Markus, Friday, April 28, 2017, 2:32:50 PM Another mail from me should appear in a minute, with a typo saying I have 1500pF and 10 ohms low inductance resistor "Drain to Gate". It is of course
Hello DK7FC, Friday, April 28, 2017, 2:40:41 PM Amp circuit and info here: http://www.w1vd.com/137-500-KWTX.html I use the W1VD LPF set up too, a total copy of Jay's design http://www.w1vd.com/LPF.ht
