it is really strange ..........., the strangest thing that the problem is the same for the two PSU, so it should not be a broblema capacitors. Last attempt, I disconnect the output RC filter (1 Ohm/17W in series with 680nF) .... let's see what happens?
.... solved, the problem was the capacitors have replaced them with 4 new from 10000uf 100v
Hello,
this type of preamp / circuit, as a measure output impedance, input impedance? bandwidth ?
thanks
sorry ... another question; R2 is 10 ohms? input does not include a capacitor? output is 1uF electrolytic?
sorry for all these questions ...
?Hi apexaudio!
What pre-amp would you recommend for this amplifier? Maybe with schematic+PCB already posted by you on diyAudio?
Hello, add me to the same question!
#374 - http://www.diyaudio.com/forums/solid-state/162043-mosfet-amplifier-irfp240-irfp9240-38.html
How do I know which leg is drain and which is source on the FET devices? It seems the same - and I cant know for sure if you mirrored some of them.
Thanks, but I am aware of the physical layout of the transistors - I was talking about the logical layout in the schematic - sorry if I was'nt clear.
It takes 20 secs to find a reference on the net. Just posting a link is surely quicker than discussing what is out there. https://learn.sparkfun.com/tutorials/how-to-read-a-schematic/schematic-symbols-part-2
Thanks Ian, but if you look at the schematic posted by apex (link in my first post), you see that both n and p-channel fets legs D & S are the same - you cant tell the difference - that is what is getting me confused. Please look at my attached picture.
The link you posted shows different kinds of p/n mosfets - you can tell which legs is which because they look different or are positioned different than the others.
Sorry if im just stupid - but look at the picture and tell me you are not confused
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