Author Topic: WFC Not Over Unity  (Read 14091 times)

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Re: WFC Not Over Unity
« Reply #24 on: December 15, 2012, 15:13:22 pm »
There's something I haven't seen being discussed any on these forums and that is the purpose of the 220 Ohms resistor Stan had in parallel with the Primary coil of his VIC Transformer. Anyone want to take a guess what its purpose is? ;-)

My guess is to absorb BEMF.

TS

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Re: WFC Not Over Unity
« Reply #25 on: December 15, 2012, 15:48:17 pm »
There's something I haven't seen being discussed any on these forums and that is the purpose of the 220 Ohms resistor Stan had in parallel with the Primary coil of his VIC Transformer. Anyone want to take a guess what its purpose is? ;-)

My guess is to absorb BEMF.

TS


I agree : )

 I use a diode across the primary instead

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Re: WFC Not Over Unity
« Reply #26 on: December 15, 2012, 18:16:33 pm »
Tuning, limiting, adjusting.
A point of view from outside:
There is a point of perfection depending on the coil design.
I imagine in the various cases and choices this resistor could change a small amount depending on what you need to see in the circuit.
 

There's something I haven't seen being discussed any on these forums and that is the purpose of the 220 Ohms resistor Stan had in parallel with the Primary coil of his VIC Transformer. Anyone want to take a guess what its purpose is? ;-)

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Re: WFC Not Over Unity
« Reply #27 on: December 15, 2012, 20:30:45 pm »
Ok guys this is my guess and observation to the purpose of the 220 ohm resistor in parallel with the primary coil. I think its to match impedance during "Off" time, gating!
Secondary Coil: 72.4 ohms
L1 Coil: 76.7 ohms
L2 Coil: 70.1 ohms

Total Resistance = Sec+L1+L2
Total Resistance = 72.4 + 76.7 + 70.1
Total Resistance = 219.2 ohms

As for pulse "ON" time, the frequency will do the impedance matching for the VIC Transformer.

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Re: WFC Not Over Unity
« Reply #28 on: December 16, 2012, 12:49:07 pm »
Seems more a coincidence to me.

The primary during pulse off receives another pulse of same polarity but right before and after this happens its voltage and source adds up to destroy the switch. This resistor limits this voltage rise no magic. Is also acts as a load for the incoming pulse. A snubber is also needed to control the potential rise between source and drain... basically is better to use 1200v or more switches...



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Re: WFC Not Over Unity
« Reply #29 on: December 18, 2012, 15:25:40 pm »
Hy Tony sorry for offtopic but is ok to build your schematics from your site?(PLL .scaning and pulse indicator)are they complete? because i see some holes unconected(see att).thanks

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Re: WFC Not Over Unity
« Reply #30 on: December 18, 2012, 15:28:55 pm »
Hy Tony sorry for offtopic but is ok to build your schematics from your site?(PLL .scaning and pulse indicator)are they complete? because i see some holes unconected(see att).thanks

Not to mention the pin 11 to 12 error was still there last time I checked.

TS

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Re: WFC Not Over Unity
« Reply #31 on: December 18, 2012, 19:39:42 pm »
Hy Tony sorry for offtopic but is ok to build your schematics from your site?(PLL .scaning and pulse indicator)are they complete? because i see some holes unconected(see att).thanks

Not to mention the pin 11 to 12 error was still there last time I checked.

TS
On what ic?