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ok here my tries := IRF510 Datasheet including this INFO: gfs = 1.3 @ 3.4 A and sometimes in other datasheet 1.3@4 A. & VgsOFF=4V i do not know what if that gfs is same as Kp or gm ; i assume it is gm ; thus: as Id = Kn (Vgs - VgsOFF)^2 ........ (1) also gm = 2 root (Id * Kn)...

guys i had spend more times on how to determine the drain current exactly using the prefer equations , but I failed i think the problem comes from extracting the correct Kp (constant of mosfet) any one can put here in details how to calculating + writing the procedures&equations step by step...

Kn is the constant of Mosfet that is used in calculating the current of the drain as this formula give: Id= Kn (Vgs - VgsThreshold )^2 where id = drain current Can you give me an example of circuit using mosfet with voltage divider and without putting Rs (resistor on the source leg) which...

Dear vk6kro; think you very much i will try to use the full sentences but can not promise if i forget this restrict so be patient with me i am an Arabian man and you know how much Arabs go to worst in learning ; my problem started when i was in my lab then i had build my circuit of colpitts for...

it is OK! i wish if you supply me with the correct method on how to find the value of Kn because the datasheet not mentioned for this value ; all i know is to calculate this value like this below: Kn= (gfs)^2 / (4 * Id) are there any other way to extract the accurate value of Kn from datasheet...

why i observe all this wrongs done when i removed Rs from the source? i had read more books on oscillators design all of them work as i calc but on mosfet i had failed...nevertheless i success design my oscillator on MOSFET only an just only when i build it with Rs (regenerative resistor) ...

but does not like i calc v0=5 what about UId does its same result?

god help mee;;;; it did not work on lt-spice what should i do please try to build it on lt-spice to loook at by your self

there is something strange in my lt-spice when i build my circuit mosfet with voltage divider + NO Rs (@Source Lead) i did not get the corresponding Id current WHY? my parameter: R1=R2=100K Rd=400 Id=10 mA where i used IRF510 with Kn= gfs^2 / 4Id = (1.3)^2 / (4 * 3.4 ) = 124 mA/v2 i...

there is something strange in my lt-spice when i build my circuit mosfet with voltage divider + NO Rs (@Source Lead) i did not get the corresponding Id current WHY? my parameter: R1=R2=100K Rd=400 Id=10 mA where i used IRF510 with Kn= gfs^2 / 4Id = (1.3)^2 / (4 * 3.4 ) = 124 mA/v2 i...

long time when i had tried more on how to extracting Kn from mosfet datasheet finally i found it; i datasheet look at gfs parameter with its details lets take IRF510 ---------------------------------------------------------- gfs------------ 1.3 ----------- @3.4 A ----------- simens...

yes that's right but in practical in my lab when i build the circuit it's did not success why? 9V |-------------| | Rd=660 R1=100K |-----------------V0 = should be >5 put in practical about 300mv Why? | -- |-----------| IRF510 |...

I'm encounter a problem in biasing mosfet irf510 ; please someone answer me... why i can not get an output over than 3V i had using voltage divider to bias at 4.5V (R1=R2=100K) ; Vdd=9V; Vout should be = 3V .. Rd=600 OHM where Id=10mA the problem here that i do not like to use Rs as source...