Kapanadze Cousin - DALLY FREE ENERGY

[lost_bro]

Hi All.
Thanks lost_bro in response to the point "In regards to the  slow rising edge on the sg3525 generated waveform"
I was not sure why (and you're right on the lower frequencies)much better.

I do not know whether to use another driver change anything as the generator I have such a signal the measurement is no driver some are miserably looks
as you wrote that it can be cleaned! It even with this in their spare time after will prove quite interesting
I was wondering whether the finished system will not work the same:
http://www.ebay.com/itm/PWM-Generator-Controller-Adjustable-Frequency-100-400kHz-SG3525-Module-arduino-/121263675145
because sometimes the cost of the components of this consignment knocks on his feet

while it decreased cycle such a signal as below:

Good Day Tomtech29

Well, those waveforms look really bad!!!!!!!!!!

I recommend that you do NOT waste your money on the above posted link for the SG3525 module.  Already purchased it a while back.  Have attached the minimum, maximum frequency scope shot and a shot of 36kHz.

At very low frequency ie; 184Hz , the wave form is acceptable.........
At 36kHz, the wave form is usable for most purposes but still shows signs of loss of fidelity.
At top end frequency of 124kHz, the waveform is very sorry indeed. 
Using a mosfet driver with integrated Schmidt trigger, the wave form will be improved beyond recognition ( considering the sorry A$$ shape it was at the SG3525 module output).

I was/am disappointed with this SG3523 module;  Besides the fact that is has very poor response/nasty waveform at medium/fast frequencies,
It only has ONE output routed/connected to the pcb......

This module does not output *both* channels, so it CANNOT be used in a push-pull type XFRMR!!!!!!!!!!  Only one output, so it at best is just a simple PWM and it does a Sorry A$$ job at that.

For anytype of serious work, it is a bad joke.

take care, peace
lost_bro

EDIT:   forgot to mention that the module does NOT output a frequency greater than 124kHz........ (No 400kHz on my module) one could spend time to change out the cap and/or resistor on the timing pin of the SG3525, but considering how nasty the output is at only 124kHz, there is no reason to even try.

EDIT#2:  probably this is due to the quality of the actual SG3525 used in this module, to be fair, *if* they had used a *real* SG3525 I.C. on the module then this might be a different story.  Generally you get what you pay for.

[Hoppy]

I was/am disappointed with this SG3523 module;  Besides the fact that is has very poor response/nasty waveform at medium/fast frequencies,
It only has ONE output routed/connected to the pcb......

take care, peace
lost_bro

Well at least your two pots are not soldered-in wonky! 

[Tomtech29]

hi
How can you not much you have to learn I did not know that I would receive an honest answer Thank you.
- glad to hear that you are a person not indifferent and what you have to say is a proven and reliable command
I know now that there is not another pile of crap I bought recently such a small (Water Oil Diesel Fuel Transfer Pump) and it turned out that does not lead to the canister by the flange,
good sell just not practical hmm.
These pcb is as you say, what so cheap is "expensive" I thought that PWM is only one channel (I drove to the theme of kit because he was ready and cheap).
if they manage to find something else?

I read this post again Dog-One.
and I realize how much Work! you put into it, and the knowledge of the constructive Such simple solutions can not exist.
- But there is nothing disapointed I could learn something through

"Speaking from experience, I initially used a SG3524 which gave me full PWM (0 - 50% duty cycle) control and frequency (8 - 40kHz).  Connected to this chip I used a pair of 14 amp IXYS gate drivers and did the switching with a pair of IRFB3077 MOSFETs.  All seemed fine and dandy.  I could control frequency and power level no problem at all.  What I discovered driving the yoke (toroid) transformer with this circuit is that you really need to run the duty cycle pretty close to 50%.  You don't want to be at 50% with no dead time because the core will saturate and begin to draw mega amps.  If you run the duty cycle at say 20%, the wave form on the output side is not even close to a sine wave.  Rather, it's badly distorted.  The catch is when you run near 50% duty cycle you get a good sine wave on the output, but with the grenade and induction heater coils connected, you almost get a runaway condition on current draw.  It's very tricky to find the right value resonant capacitors to tame this current draw down, but if you get them, you'll see a nice sine wave and current draw will sit at about 5 amps powering a 60 watt incandescent bulb."

I will have to learn how to ask questions that do not know the answer it may sound strange. Thx

[NickZ]

   Hoppy:
   The primary coil of my newly wound 24v yoke is wound with both primaries in the SAME direction. Could this be the cause of the problems.  Are they supposed to be wound in opposite directions? OR NOT?
   It looks like Ruslan's yoke primaries are wound in opposite directions. 

[Hoppy]

   Hoppy:
   The primary coil of my newly wound 24v yoke is wound with both primaries in the SAME direction. Could this be the cause of the problems.  Are they supposed to be in opposite directions? OR NOT?

Yes, that's OK. The winding should be continuous in direction from start to finish with a centre tap.