Hi all.
i had an idea for easy making PLL circuits,for testing the basic WFC's Meyer Tech.
The importance of Perfect 50% duty cycle frequency generator crkt and Gate frequency generator crkt is;
1.Perfect 50% duty cycle frequency generator crkt is for driving a soft iron toroidal transformer and for driving at resonant frequency.
2.Gate frequency generator is low tune on (5%)3rd picture, like Stan said.or match water resonant frequency or waiting for completely discharge.somethings like that,i'm not sure.
Problem with 555 timer is;
1.not perfect 50% duty(~60% or ~40%),if use Dave Lawton crkt that can adjust 50% duty but frequency change.you need only change frequency but no change in 50% duty.
i have 2 crkts for solving that problem.i need to share very easy circuits.
(1) flip/flop Perfect 50% duty circle frequency generator circuit for driving mosfet.
-Capacitor can use both types(non polar or polar),frequency range depend on Capacitor
(small F = high frequency,1uF about 50-60HZ,0.01uF about 5kHZ,1nF= about 50kHZ,0.5nF about 120kHZ).
-R 680 can change to 1k(9V supply) or 2k(12.5V supply).R10K can change to 15K(12.5V supply).
-BC547 can change to 2n2222,2n3904,2n4401.
-1st picture is flip/flop inverter.4th picture is modified circuit for create pulse signal 1 output to drive mosfet.
-crkt problem is "fixed frequency but perfect 50% duty cycle".
(2) 4046 Perfect 50% duty circle frequency generator circuit(0HZ-1.5MHZ).
- if need to try big range( 1HZ-1.5MHZ) to learn or find resonant frequency,i think this is good.i tested with my oscilloscope.in 1.5Mhz that can maintain perfect 50% duty cycle.this is CD4046B,CMOS type.i tried like Ted (CD4093) but not perfect 50% duty cycle.4046 need 1 resistor(22k),1 potential meter(i used 220k) and C=47pF.Very easy!!
-crkt problem is "when drive power mosfet above 25khz range,this **can't** maintain 50% duty cycle".i think "this circuit can use to find resonant with low voltage but can't drive power mosfet".maybe mosfet driver can drive over 25khz+ with 50% duty cycle maintain.
-about Gate frequency generator,i don't finish yet.may be Russ has that.
thanks
geenee
i had an idea for easy making PLL circuits,for testing the basic WFC's Meyer Tech.
The importance of Perfect 50% duty cycle frequency generator crkt and Gate frequency generator crkt is;
1.Perfect 50% duty cycle frequency generator crkt is for driving a soft iron toroidal transformer and for driving at resonant frequency.
2.Gate frequency generator is low tune on (5%)3rd picture, like Stan said.or match water resonant frequency or waiting for completely discharge.somethings like that,i'm not sure.
Problem with 555 timer is;
1.not perfect 50% duty(~60% or ~40%),if use Dave Lawton crkt that can adjust 50% duty but frequency change.you need only change frequency but no change in 50% duty.
i have 2 crkts for solving that problem.i need to share very easy circuits.
(1) flip/flop Perfect 50% duty circle frequency generator circuit for driving mosfet.
-Capacitor can use both types(non polar or polar),frequency range depend on Capacitor
(small F = high frequency,1uF about 50-60HZ,0.01uF about 5kHZ,1nF= about 50kHZ,0.5nF about 120kHZ).
-R 680 can change to 1k(9V supply) or 2k(12.5V supply).R10K can change to 15K(12.5V supply).
-BC547 can change to 2n2222,2n3904,2n4401.
-1st picture is flip/flop inverter.4th picture is modified circuit for create pulse signal 1 output to drive mosfet.
-crkt problem is "fixed frequency but perfect 50% duty cycle".
(2) 4046 Perfect 50% duty circle frequency generator circuit(0HZ-1.5MHZ).
- if need to try big range( 1HZ-1.5MHZ) to learn or find resonant frequency,i think this is good.i tested with my oscilloscope.in 1.5Mhz that can maintain perfect 50% duty cycle.this is CD4046B,CMOS type.i tried like Ted (CD4093) but not perfect 50% duty cycle.4046 need 1 resistor(22k),1 potential meter(i used 220k) and C=47pF.Very easy!!
-crkt problem is "when drive power mosfet above 25khz range,this **can't** maintain 50% duty cycle".i think "this circuit can use to find resonant with low voltage but can't drive power mosfet".maybe mosfet driver can drive over 25khz+ with 50% duty cycle maintain.
-about Gate frequency generator,i don't finish yet.may be Russ has that.
thanks
geenee