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Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
What about finding a little relay that can operate on 5V or just wire up a transistor so you can run it off a 9 volt battery with the base of the transistor connected to the TTL. Then fill up the relay with oil- However, I guarantee that you will not get quite the rise times you want. Care to tell some details? Not many switches have less than 10ns rise times, so a high voltage one is going to be hard to come by. Rise times on IRFP460 mosfets are still 59ns...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The only devices I know of that can do anything like that are the HV solid-state switches from Behlke (link)
If you want a 2ns rise time, I think you'll actually need a hell of a lot more than 2mA from your switch. Your circuit will have capacitance, and it will probably take several amps to charge it to a few kV in 2ns.
Registered Member #266
Joined: Mon Feb 27 2006, 08:34PM
Location:
Posts: 4
It was 10nS, not 2nS, but yeah, I agree.
When I said "switch" I of course meant "some kind of solid state switch" , not electromechanical.
The capacitance is about 5nF....I'm just driving some electrodes in a small beam system, but there is a 4.7nF cap at the plate I understand. I just mentioned the low current spec so that people would think in terms of "small package".
I have a low duty cycle ~ 10% so I could probably pre-charge a cap from the low current supply in the off-time in order to get the current neccessary to attain my risetime.
Just trying to put 10lbs of *&#$ into a 2lb package,
Thanks for the Behlke link. They have some nice stuff.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Krytrons are pretty much your only option, for exaple they are usind in q-switched lasers where ns risetime is critical. they are quite hard to find, but if they show up on ebay they are usually quite cheap. Just watch out not to get a "removed from working equipment" one, they only have a usefull live measured in 10s of hours.
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Looking for a High Voltage (~5kV) Low Current (2mA), fairly fast (<10nS rise) mini switch module
