Power Saver Project Help needed

The MOSFETs are SPW47N60C3

Try a 20 ohm resistor in series with the 555 supply voltage ( the 12 v dc), to limit the current.. ( apparantly it could be a 555 bug?! Not sure). But it will work.

after all what i know and have seen from you i cant recommend to work at mains voltages. For anybody else check this http://everycircuit.com/circuit/4588917977513984

@hurz, looked at your circuit, and while it is valid, one has to consider that one side of the mains supply is the neutral (read earth) and as such I think this circuit will only work well if an isolation transformer is used; http://everycircuit.com/circuit/5861430166552576

no, it does work as shown, but no question its dangerous! no isulation. the chopping frequency is rubbish, cause its much to low for a fan motor

@BillyT, do not make the mistake and take the earth symbol as the ONE earth which we have at mains supply. its just a zero volt reference, and its a pitty we do not have the ability to have more of them in EC to separate such circuits in its reference points. Again, it looks like earth symbol but its not ment to be the earth reference its just a 0V reference point.

@hurz. More zero reference points, would that not make the oscilloscpoe job a nightmere?! Unless there is s switch to switch between circuits. ( l know you know).. A transformer provides isolation,, but not on EC. Cause you have to short it out or it won't work. @billyT in a way is right cause that is what we need to do in rlf. If we want to moniter isolated part of cct. With the same oscilloscope, but on EC that is not posdible cause you have to use the same ground on both primary and secondary.. It is not easy,, cause if we could use isolation transformers ( on EC) , then the second ground woud not be related to 1st. Ground. So euthe a swich is needed, or split the scope into two display ( at will). It needs to be thought about carefully. No isolation possible.. Also more importanly and possible thing would be,, the ability to move the zero level on the oscilloscope.. . As it is the scope provides us with no control,, ( on triggering,, zero level,, isolation,, capture events,,etc,) , all this requiers serious bandpiss team.. And money ( investment),,

.. Correction.... Bandpass team

kiani, you have a talent to destroy simple ideas and make it complicated to continue any discussion. Anyway, its a pitty we cant isulate things from each other

If this is the case, it is not intended,, thank you A hurz for speaking your mind, cause you do have a mind. ( unlike some other people). I shall think about what you say.

thanx

Consider, http://everycircuit.com/circuit/5882845141925888

before we go into a deep discussion of "ground" lets get rid of 555 cuz 555 does has an internal ground sonewere UNFITUNATELY cuz this makes it impossible to use 555 in flying highside driver curcuits. Anyway, we remove it and replace it with an arbitrary AC source, right? Check this http://everycircuit.com/circuit/5850410337435648

Am begining to think it is not a good idea to try learning electronics with the aid of a simulator ( with lots of hidden factors and numerical mathematics,, plus buggs),,, once we learn about buggs and limitations of sims.. We might then apply those limitations into real circuit design... For the same reasons, as kids were not allowed to use calculators, before we knew what we were doing.. Or not being allowed to write with biro before we could write with pencil. It certainly is a tool fo confusion sometimes,,, and can distract one fron solving a problem in electronix, to solving why the sim. Behaves the way it does in some situations,,,. And figuring out the sim. Does not help with the possible problem at hand with the real electronics circuit. One has to bw very careful not mislead himself and be mislead by any sim.

It took me sometime to realise that this earth sign (groung) , is nothing to do with,,, LIVE, NEUTAL, nor EARTH,,, and also,,, it is nothing to do with the circuit either.... It is the ground of the oscilloscope.... ONLY. One could put (place) the ground of oscilloscope ANYWHERE, and get different view of voltages and currents.... Therefore the current flow is nothing to do with where the ground of sim. Is placed.. Ie. It will NOT change the operation of the cct., AT ALL., it looks as if it does because the waveforms look different, drpening on where it is placed. . While the circuit operation and current flow remains UNCHANGED. exactly the ssme as oscilloscopes do not affect the operation of a circuit.. Oscilloscope is just a voltmeter,, with two probes,, uasually marked black wire ( -ve or ground,,,,,,,,,+ve red, or positive.).. Now the -ve or ground of voltmeter does not change or affect the cct. In anyway. As @ hurz would say holy shit.

right, you can put this earth symbol anywere you want and its just a reference to zero volt for anything you mesure, not only on scope, and you can also declare it as your mayor !earth ground! but then you get in trouble at the moment you want to demonstrte an isulation, cause there is just one reference point in EC you can make.

The way i look at it,, is a simulator is also a fancy voltmeter. One which you can program the circuit in its memory and it gives you (estimation) of reality. one could argue that an Ametrr and an ohm meter are also simulators,, cause they are really just voltmeters (hardware) programed to indicate resistance and currents. Now a simulator is based on solving equations which represent the behaviour of components.... Maths... Equations.. .. in simlpe terms...x+y=0, aX^2 -2y =0,,, dy/dx +2y =0. Now notice the zero. In all the equations,,, so ZERO is zero,, even if we have ten of them it is the reference to all equations. In other words.... You can have ten apples, or 10 bananas (yamm) , ten carrots, but you can only have ONE Zero... Now. Zero apples,, zero bananas(😥), makes no difference, , cause that is the kind of guy ZERO is. Ok?!

between groundA and groundB might be any voltage delta, even millions of volts, or 0! But they are not connected, as it is unfortunately with a single ground symbol we only have. We can mark a second reference level with a double ground symbol to make it clear its not the single ground one. But we cant seperate them!

Off course,, having another isolated earth, means we are in a different shop with different but maybe similar set of items. Now the isoulation barrier depends on media and gap(distsnce), but until that breaks down,, it is irrelevant, isn't it !? To have two sets of isolated earth we would need time share the sim. Or have two sims,. Or do two separate simulations (for specific finite smount of time) and overlay the result, and somehow pass some varablrs between while running the sim during the overlay.,, unless there sre more clever ways of being in two shops at the same time.

no, just set a delta voltage, e.g. to 0V, and do it in one run, no need to split it into two runs.

Ok, to summarize the comments, this isn't a good idea. The choppiness of the wave is horrible, and no isolation. The ground symbol just means a 0V point for the oscilloscopes.

As i said at beginning, you better dont work with mains, this is far beyond your knowledge. Help us to understand what makes the coil change its resistance and what values have you measured over days?

I at first measured its resistance at 220 Ohms 6 months ago, 3 Months ago it was at 206 Ohms, and the last time I measured it, it was 186 ohms. After my most recent measurement, I took the fan apart. The motor has a switch, with 4 options (OFF, 3, 2, 1) that has 1 input, Hot, and 3 outputs going into the casing of the fan. The resistance from input to each output was basically none. I then measured each output to neutral( The plug os CAT 1 and polarized ), each output had a different resistance, some higher than the others, and they changed when the switch was set to another position.

How importante do you think is the resistance for the overall power of a fan?

You could take a more accurate guess on its power consumption, right? Or is this completely wrong???

im afraid, its completely wrong

Well damn, is there any way to get its power consumption other than with a meter?

"other than with a meter?" some measurements you need, but offline wont help as long you do not get impedance correct! Guess its a two phase AC motors, while one phase is done with a phase shift capacitor. So its a inductive load while resistance is just makeing some heat but doesn't help to turn the motor.

It has a capacitor of 4uF(electrolytic), but I have no idea to what it is connected to. I'll just buy an Ammeter for it. Thanks for the help, appreciated.

4uF is connected to the second motor winding. Without it, it does not start rotate!

This is exactly what i guessed a few days ago, check this motor setup http://everycircuit.com/circuit/6600615227817984