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Re: [TCML] spark gap substitute...?



Good question. I haven't gotten that far yet. I'm still working on getting them all to fire together. Steve recommended that I try using windings on small toroids connected to the gates of the SCR's and run a common primary through them, perhaps even a single wire, to fire them.

I am in the process of setting this up. I have the ferrite toroids but I haven't yet decided how many secondary turns I will need and whether to try a single turn primary. I really want to get the timing right to fire them and then I will worry about turning them off. Also, like I said, I have been without my oscilloscope and I don't like driving blind. Now that I have the new one, I will begin to work on this again. Also, I am always open to any suggestions.

I'll be glad to post things as I get any results.
Paul
Think Positive

----- Original Message ----- From: "Jon Danniken" <danniken@xxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, January 27, 2010 1:46 PM
Subject: Re: [TCML] spark gap substitute...?


Paul Brodie wrote:
Evidently you missed my recent questions about this and the limited
responses to them.

I have been working on this very thing. I have (3) 1200 volt SCR's
rated at 90 amps that I am attempting to use in series to trigger a
low voltage coil. Well, low voltage for a TC, anyway. Steve Ward
recommended a way to simultaneously trigger all three SCR's and I am
working on this. I haven't made much progress, yet, because I sold my
O-scope and bought a new one to replace it that I only got in very
recently.
I'll be glad to share what I am doing, if you would like to write to
me off list. If it is okay, I guess I could share what I am doing on
the list. It is on topic.

How are you turning off the SCRs while they are conducting? They normally don't turn off until the current going through them drops to zero, unlike a transistor which can be turned on and off independently of the load they are switching.

Jon
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