As time goes on I seem to be here more and more often..
I've built a modified circuit I found online which I can use for home made inductors, for experience, research, just for the heck of it, whatever:
I'm not quite sure if the 391Ω resistor is correct, since I just trim it to get about 40 kHz, but it shouldn't matter that much. The 4R7Ω is a big 50W one.
The symbol for the MOSFET isn't right. Its an avalanche rated 900v 5A sucker. (Datasheet attached) This could be where I'm going wrong if I've got the wrong one?
So basically I rig up the scope and get this output:
Which just confuses the heck out of me.
Shouldn't it be showing some sort of deflection on the up, as well as the down??
In addition, if I connect to TP3, I get no deflection of any sort. What's going on here?
(EDIT: I get a +10v deflection, sorry)
Thanks -- I'm probably being a bit dim.
I've built a modified circuit I found online which I can use for home made inductors, for experience, research, just for the heck of it, whatever:
I'm not quite sure if the 391Ω resistor is correct, since I just trim it to get about 40 kHz, but it shouldn't matter that much. The 4R7Ω is a big 50W one.
The symbol for the MOSFET isn't right. Its an avalanche rated 900v 5A sucker. (Datasheet attached) This could be where I'm going wrong if I've got the wrong one?
So basically I rig up the scope and get this output:
Which just confuses the heck out of me.
Shouldn't it be showing some sort of deflection on the up, as well as the down??
In addition, if I connect to TP3, I get no deflection of any sort. What's going on here?
(EDIT: I get a +10v deflection, sorry)
Thanks -- I'm probably being a bit dim.
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