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Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Hi, I am testing here all setup of tesla coils at low voltage supply (12V) With my circuit I can get about 1cm or sparks at a 120kHz secondary coil with antenna feedback and only with 12V in :D
I try to run it with a Feedback transformer that I winded with 1:55 turns with my old GDT Toroidal core (It was runned in my 400kHz SSTC's) but it didnt work (I get a fluorescent lamp near the coil to see if its going high voltage on the secondary, but it gets no light).
I try to reverse the Transformer wires in the driver but it didnt work too. Here is the schematic:
Soon I will make a Fullbridge SSTC of IRFP460 , I will post some results here :D
Registered Member #1024
Joined: Sun Sept 23 2007, 10:56AM
Location: Northern NSW, Australia
Posts: 95
Try adding a resistor in parrallel with both D3 and D4 to ensure U1:A is biased halfway, 10k should do it. May not make any difference , but thats the setup on my coil , using a torroidal ferrite with approx 50 turns as secondary base feedback, mind you mine doesn't do much at 12V Pri. You may need a little more Pri power in for the feedback transformer to develop enough V, or maybee more turns on the feedback transformer.
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
Hmm, I will try to add some 10k resistor in parallel to the 1n4148 diodes.
About the voltage, I was thinking about it, but I dont know if it isnt too many volts at feedback transformer, I will try to get a scope to measure the voltagem on transformer out.
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Feedback Transformer Question
