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Availbale Products, Material- and Service suppliers => Do It Yourself => Topic started by: Belfior on December 15, 2017, 05:36:11 PM

Title: voltage pump for coil experiments
Post by: Belfior on December 15, 2017, 05:36:11 PM
Trying to build simple voltage source for my coil experiments. Simple and high enough voltage to jump a 90V - 600V gas discharge tube.

I got this built http://tinyurl.com/y9rt2tlz

Voltage stops at 220V on my 2000V DC cap. Could you tell me why it stops at 220V and what should I add to the circuit to make it go higher? I mean 220V from a 6V battery is nice, but why does it stop and can I boost it further to maybe 1000V ? Added a 10k pulldown resistor between source and negative rail and cap went to 6,5V
Title: Re: voltage pump for coil experiments
Post by: sm0ky2 on December 15, 2017, 05:57:46 PM
Try putting 2x 6v batteries in parallel?


Could be approaching the cut-off current through the
transistor gate?


Minimum values should be on the data sheet
c-e current, or sometimes cec (conductivity value)
I suspect that if you did some ohmic algebra those
numbers might be close to the same.



Title: Re: voltage pump for coil experiments
Post by: Belfior on December 15, 2017, 07:15:02 PM
Try putting 2x 6v batteries in parallel?


Could be approaching the cut-off current through the
transistor gate?


Minimum values should be on the data sheet
c-e current, or sometimes cec (conductivity value)
I suspect that if you did some ohmic algebra those
numbers might be close to the same.

Hmm the gate is fed through a function generator with 7V DC 2kHz square wave in my actual circuit. Isn't gate current separated from the source-drain source? What came to my mind is that the inductor starts to discharge back to the power source, because the "tension" on the other side of the diode is so high or the mosfet does not switch fast enough