Author Topic: Stable Gated PWM Progress  (Read 18607 times)

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Re: Stable Gated PWM Progress
« Reply #8 on: February 21, 2009, 21:05:29 pm »
Well, the 555 chip I'm using can go up to 2.4 Mhz.  so we have plenty of room. now I just have to find out how far I can push the LM311.

Jolt I'm worried something will happen to you , plz release a quick draft to Stevie .

Not like this guy ..

http://hydrogencollective.com/

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Re: Stable Gated PWM Progress
« Reply #9 on: February 21, 2009, 21:44:53 pm »
no need to worry.

and yeah, the circuit I'm working on works just like that.


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Re: Stable Gated PWM Progress
« Reply #10 on: February 22, 2009, 16:16:18 pm »
I tested how fast I can push the LM311 and I'm happy to say it can handle over 1.1 Mhz. so looks like this circuit will have a range from about 100 Hz to 1 Mhz.

There is a little problem at the high freq side, when adjusting the freq, the pulse width does change a little, but we can adjust the pulse width and maintain the same freq.

Maybe once in assembled in a PCB this issues will go away. test boards like the one I'm using has built in capacitance and they no good for high freq testing.

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Re: Stable Gated PWM Progress
« Reply #11 on: February 22, 2009, 19:57:15 pm »
I tested how fast I can push the LM311 and I'm happy to say it can handle over 1.1 Mhz. so looks like this circuit will have a range from about 100 Hz to 1 Mhz.

There is a little problem at the high freq side, when adjusting the freq, the pulse width does change a little, but we can adjust the pulse width and maintain the same freq.

Maybe once in assembled in a PCB this issues will go away. test boards like the one I'm using has built in capacitance and they no good for high freq testing.

Plz Electrojolt , the waiting is killing us .

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Re: Stable Gated PWM Progress
« Reply #12 on: February 22, 2009, 20:16:01 pm »
patience dankie. lol
let him get it right then we can see.

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Re: Stable Gated PWM Progress
« Reply #13 on: February 22, 2009, 21:59:10 pm »
I tested how fast I can push the LM311 and I'm happy to say it can handle over 1.1 Mhz. so looks like this circuit will have a range from about 100 Hz to 1 Mhz.

There is a little problem at the high freq side, when adjusting the freq, the pulse width does change a little, but we can adjust the pulse width and maintain the same freq.

Maybe once in assembled in a PCB this issues will go away. test boards like the one I'm using has built in capacitance and they no good for high freq testing.

Plz Electrojolt , the waiting is killing us .

Hey Dankie, just hang in there, Fortunatly I have a Full time Job and a Wife, I don't have much time to work on this, I have been working on it litle by litle and posting my progress. I think I have a stable circuit now and I'm starting to draw the schematic. I think I should have it ready by Mid week.

for those who want to build it will need two 555s, 2 LM311, 2 100K Pots, 2 10K pots, some 1K and 10K resistors, and some capacitors, 1 PNP and 1 NPN general purpose transistors, 2 fast switching diodes, those little red ones.


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Re: Stable Gated PWM Progress
« Reply #14 on: February 22, 2009, 22:06:41 pm »
I tested how fast I can push the LM311 and I'm happy to say it can handle over 1.1 Mhz. so looks like this circuit will have a range from about 100 Hz to 1 Mhz.

There is a little problem at the high freq side, when adjusting the freq, the pulse width does change a little, but we can adjust the pulse width and maintain the same freq.

Maybe once in assembled in a PCB this issues will go away. test boards like the one I'm using has built in capacitance and they no good for high freq testing.

Plz Electrojolt , the waiting is killing us .

hahahahahaha

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Re: Stable Gated PWM Progress
« Reply #15 on: February 23, 2009, 05:17:27 am »
Donald,

I usualy get my stuff from mouser.com, newark.com, Ebay. I browse arround.