Variable duty cycle and frequency with a 555

enough.

them ,

mosfet and coil??

Jim, I am trying to replicate an experience i saw on youtube:

I am using a different oscillator, the rest is the same K

enough.

them ,

mosfet and coil??

So the CFL is wired across the coil?

I take it, from the YouTube comments, that no schematic exists?

Lose the Google, post via a real Usenet provider. ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| Phoenix, Arizona  85048    Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

enough.

put them ,

stuff.

mosfet and coil??

I posted the schematic on my web site. But he uses a 555 timer, and at the output a CFL is to be placed.

K

Nope, the rest ain't the same. He separates the functions and manages the ground currents. The devil is in the details and often not shown on the schematic.

WOW! A video showing that he can flash a light. Makes no claims. Draws no conclusions. I want the 7 minutes of my life back.

control the frequency and duty cycle(1% to 99%).

but when completing the circuit, I found that when varying the frequency.. the duty cycle was also changing !! or vice versa.

fast enough. I can see on the scope that the 555 pulse starts to deteriorates

2.5us while the lm393 starts about at 100us

Returning to pulse generation rather than vagaries, the pulse generator is trivial...

...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| Phoenix, Arizona  85048    Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

control the frequency and duty cycle(1% to 99%).

but when completing the circuit, I found that when varying the frequency.. the duty cycle was also changing !! or vice versa.

fast enough. I can see on the scope that the 555 pulse starts to deteriorates

2.5us while the lm393 starts about at 100us

Thanks Jim I will try your circuit. here is the original post:

You cannot see the CFL, but there is another video which he has 5 CFL fully turned on. Hes got wires going all over the thing. Plus in my circuit pictures, all the black wires are redundant ground on the board, K

What a horror. I am surprised that the CFL didn't emit smoke. I can only find a lightning strike a worse torture for the internal driver circuit. It is definitely worse that IEEE Class C impulse rating.

Use a full transformer with L-R series load, instead of a simple inductor to model a motor. You will find a real motor jumpy and twitchy at the low frequency range of your system.

?-)

You think that is crazy, with this simple oscillator , he is able to light 5 CFL on this video:

I can hardly dim one with my circuit !! Apparently some people has been able to replicate it. so that what I am trying to do

K

We need to create three new newsgroups:

news:sci.electronics.always.wrong

news:sci.electronics.trolling

and

news:sci.electronics.you.have.to.be.kidding

I often wonder how some of these posters manage to stay alive. ...Jim Thompson

-- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at

| 1962 | I love to cook with wine. Sometimes I even put it in the food.

--
have you never heard of dung beetles? ;)

Poopfetish!

--

John Larkin Highland Technology, Inc

jlarkin at highlandtechnology dot com

Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

Some of the wild connections proposed here... one might expect there to be at least one electrocution per week.

Why-oh-why can't it be the butt-buddy triplets ?>:-} ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
| Analog Innovations                               |     et      | 
| Analog/Mixed-Signal ASIC's and Discrete Systems  |    manus    | 
| Phoenix, Arizona  85048    Skype: Contacts Only  |             | 
| Voice:(480)460-2350  Fax: Available upon request |  Brass Rat  | 
| E-mail Icon at http://www.analog-innovations.com |    1962     | 
              
I love to cook with wine.     Sometimes I even put it in the food.

I added an opto coupler to the circuit to isolate the ground from the coil. Its working 100% BTW I thought about the EM wave some where mentioning earlier, I am only oscillating at 5Hz, so I dont think that is an issue here Thank for all the time you gave me K

John Larkin's rather than John Fields'.

--
Bill Sloman, Sydney

We know you have one. Dung beetles are some of nature's scavengers, just like shellfish. they live off the wastes of other creatures. Then some people eat shellfish.

The good Lord looks out for children, and fools.

only

circuit.

inductor

low

coil.

only oscillating at 5Hz, so I dont think that is an issue here

Just in case you are still reading, the EMI issues come mostly from edge speeds rather than fundamental frequency.

?-)

Some do, more don't. Now catfish is a real dung eater. Don't trust me, check it out for your self.

?-)