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Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
If your want I still quiet a few spare parts from making this coil, not all, since some of the transistors and fets have a fairly good price tag on 'em.
As far as switching speed not sure I just looked up some speeds of diodes I knew off the top of my head and a 1n914 (searched for 1n4148) had a 4nS reveres recovery time, although it has a lower voltage breakdown and much lower current handling.
Well if you hit up digikey and look for diodes and you look at recovery speed, small signal is listed at any speed, fast is 400ns at 200ma, and standard is 500ns at 200ma, other then that I'm not quiet sure.
Registered Member #2763
Joined: Sat Mar 27 2010, 11:48AM
Location:
Posts: 14
I used the horizontal transistor SU169 but I also tested the BU508, C5386, D1555, BU250, C5521, BUH3150 advantage of this device is the simplicity in getting parts because all are located in the old TV: D
Registered Member #1731
Joined: Thu Oct 02 2008, 02:22PM
Location: Indiana
Posts: 52
So....
I just completed the Skori Mk III design and I'm figuring out how I should test it.
I hooked a couple of load resistors in place of L1 and L2 and injected a signal from a function generator in place of the return from the base of the secondary. Square wave - approx 1mhz.
I was expecting to see the 555 timer produce a short duty cycle, and this duty cycle filled with a "copy" (via the 15:30 coil) of the input on the secondary return.
Does this make sense? Or is there a better way of testing this kind of circuit before hooking it up for real?
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
You might want to shorten the leads to the primary or use more of that excess wire in the primary. All of that wire going to the primary represents inductance uncoupled to the secondary.
How is your secondary grounded?
Is that potentiometer for adjusting your primary's frequency? What range does your setup cover?
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Do all 2 transistor / 24V SSTC's have to use flyback transformers?
