Author Topic: Stable Gated PWM Progress  (Read 18606 times)

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Re: Stable Gated PWM Progress
« Reply #24 on: February 23, 2009, 18:43:54 pm »
Sorry,

the 2 driver transistors are general purpose PNP and NPN transistors, I used the ones from Radio Shack,

PNP = 2N2907

NPN = 2N4401

you can use almost any small switching transistor for this.

Now the Q is supposed to be Q3, is the Power Mosfet, here you have have a wide selection.

I use the IRF 640.

It all depends on the power you want and how fast you will be driving the circuit.

C1   .1uf   
C2   .1uf this is used to set the Gating frequency, other values needed for different freq range   
C3   1uf   
C4   .01uf   
C5   .1uf   
C6   3nf this is used to set the frequency. other values needed for different freq range   
C7   1uf   
C8   .01uf   
Q1   2N4401   
Q2   2N2907   
Q3   IRF640   
R1   1k    
R2   100k   
R3   1k   
R4   1k   
R5   1k   
R6   2.2k   
R7   10k   
R8   1k   
R9   10k   
R10   2.2k   
R11   1k   
R12   10k   
R13   10k   
R14   1k   
R15   100k   
R16   1k   
U1   LM555C   
U2   LM555C   
U3   LM311   
U4   LM311   



« Last Edit: February 24, 2009, 00:23:36 am by electrojolt »

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Re: Stable Gated PWM Progress
« Reply #25 on: February 24, 2009, 00:26:02 am »
Sorry guys, I found another mistake.. It is all Dankie's fault for rushing me.. lol

R4 1k was connected to ground and needs to be connected to positive.

I updated the schematic above.


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Re: Stable Gated PWM Progress
« Reply #26 on: February 24, 2009, 00:35:53 am »
Ok,

I have build this circuit and i can confirm that Claudio made a nice circuit, again. :) :)

br
Steve

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Re: Stable Gated PWM Progress
« Reply #27 on: February 24, 2009, 00:49:48 am »
 :) Ok do a vid to see  :o

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Re: Stable Gated PWM Progress
« Reply #28 on: February 24, 2009, 01:33:26 am »
:) Ok do a vid to see  :o

Hi Pochi!

Here is the link you are looking for:
feature=channel_page

br
Steve

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Re: Stable Gated PWM Progress
« Reply #29 on: February 24, 2009, 16:37:54 pm »
There was some errors on the 1st schematics, but I just updated all the schematics in this post with the corrected one.

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Re: Stable Gated PWM Progress
« Reply #30 on: February 25, 2009, 18:56:44 pm »
:) Ok do a vid to see  :o

Hi Pochi!

Here is the link you are looking for:
feature=channel_page

br
Steve

Hi Steve!

Thanks very nice...
What's the freq. 10khz?


Hi Steve!

What's the frequency over 10khz

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Re: Stable Gated PWM Progress
« Reply #31 on: February 25, 2009, 19:31:52 pm »
Pochi,

That is my Video, not Stevie's...

If I remember right, on that video I was testing it at 500Khz.

it can operate at anything from 100Hz to 2.4Mhz., but to go up to 2.4Mhz you need a special 555 ship like: ALD1502

you just need to change the caps I mentioned.
« Last Edit: February 25, 2009, 20:04:08 pm by electrojolt »