I'm trying to build a HV power supply consisting of a mains-driven control circuit and a flyback transformer - the circuit is exemplified in the following link:
http://jnaudin.free.fr/lifters/labhvps/images/labhvps12a.gif
the problem I have is that the output fromt he power-transistor BU-508D is not as it's supposed to be. To illustrate, the following link shows the output I am aiming for, and the attached image shows what I'm currently getting.
http://jnaudin.free.fr/lifters/labhvps/images/vbu508d.gif
As you can see the peak is not of the correct shape and has a significant DC offset for some reason. I have tested all parts of the circuit and they are working well - including flyback transformer itself. The pulse frequency is ~15kHz as supposed to.
THE ONLY THING I have modified is the potentiometer (freq.adj) in the oscillator circuit where i used a 10K instead of 4.7K since I did not have any of those at hand. I thought this might be the source of my troubles but I am not sure. If anybody knows what might be going on I'd be glad to hear it.
cheers,
L
http://jnaudin.free.fr/lifters/labhvps/images/labhvps12a.gif
the problem I have is that the output fromt he power-transistor BU-508D is not as it's supposed to be. To illustrate, the following link shows the output I am aiming for, and the attached image shows what I'm currently getting.
http://jnaudin.free.fr/lifters/labhvps/images/vbu508d.gif
As you can see the peak is not of the correct shape and has a significant DC offset for some reason. I have tested all parts of the circuit and they are working well - including flyback transformer itself. The pulse frequency is ~15kHz as supposed to.
THE ONLY THING I have modified is the potentiometer (freq.adj) in the oscillator circuit where i used a 10K instead of 4.7K since I did not have any of those at hand. I thought this might be the source of my troubles but I am not sure. If anybody knows what might be going on I'd be glad to hear it.
cheers,
L