Electronics > Best WORKING circuits for WFC

Frequency generator with gating option

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Steve:
Hi,

This schematic is the one from Dave Lawton.
I think we all build this one of these... ;)

br
Steve

Steve:
Another schematic of this with layout of a print.

br
Steve

Steve:
Here another one. Not like Dave's but with other chips on it.
This one is looking better to me.

br
steve

hydro:
Ahhh,,, i think i understand what your asking,, a frequency generator with Gating, very well put!

Stevie, if i get time tonight i will try and surf the net for more schematics on how to create a much better Frequency "With Gating." i do agree that dave lawtons circuit could have been a bit better. But as of right now the 555 timer is the best you can get for generating a frequency isn't it?

hydro:
I have been doing some thinking, and Dave Lawtons circuit Sends Square Waves to the fet, so it switches the fet either ON or OFF really fast.

I've looked into Pulsing a Transformer, i have seen that when you pulse a transformer with a 555 timer and a fet that the mosfet will send a Square Wave to the primary side of the transformer.

PROBLEMS, well, for one when you switch a fet like that on really fast when driving a transformer IT's on really Fast, this should Be Fixed, In other words you don't want a Square wave Driving the fet if you're using it to pulse a transformer, its less efficient! you need a Sine wave Driving the fet wich powers the Transformer! Why? well fast on switching of the fet is on really fast, if you use a sine wave gating then the fet is not on, its slowly coming on to its peak. so this way you get what looks to be the first LEFT HALF of the sine wave, and the fet shall not quickly Switch OFF. If the fet switches off fast then the second RIGHT HALF of the sine wave from the secondary side of the transformer will not look like a sine wave but will look like a capacitor discharge wave! for this you also need to have a sine wave DISCHARGE the fet from the coil.

when you pulse 1 side of the primary in this manner it is more effecient than dave lawtons setup. On the oscilloscope you will learn that you now see a full sine wave and not just half of one, but to get the AC sine wave you must then pulse in the opposite direction.

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