inverter demystified

there're some weird schematics up in the web as someone uses a transformer to input 12V squarewave and it outputs 153V one ?? -- i yet haven't figured out a transformer parameters for this trick

here's some tests that do simulate at least in more realistic -- as i see it ?

a sine test ::

a square wave test ::

is basically DC/DC -- with what to use for alternating the OUTP = don,t care -- a "programmed" resistors in this case

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[Eop]

HiFq Flasher revisited + SCR alternate

somewhat unusual LED-driver that i doubt will startup with 2N2222-s but might with single MJE13005 or with it's higher frequency v.

the following appears to be an in series (or in parallel) self-powering/-delimiting supply for power control -- a concept / feature-research design for . . . !!!

PS! -- it quite likely is not secure to build and use as shown e.g. one must realize the principles and shortcomings here , also extensive additional testing is needed to verify such as secure or not -- there were studied a special situations where the supply failed to lock up / delimit itself -- i haven't collected enough data on it yet !!!

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[Eop]

"Flasher" revisited , DB3 spice programmatic model Test

The inverter v. of LED-Flasher . . . at various dev. stg.-s

The boost converter v. with new voltage reference

the new voltage reference

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the next thing i actually built (*with protective fuse - not in simulation) - WYCIWYG . . . almost

. . . at both modes you mostly perceive the thing "blinking" - only the after-flash at second mode makes it some different from simple blinking . . . donno

! Note : * it is . . . wise to fuse the mains equipment  also as dumb as that coz - such being experimental you never be too careful to predict weld failure either caused by heating components or bad quality weld/materials . . . . . . . . . also when whatever fails and op.-l parameters exceed the intended design values they won't all burn off - extra to that i got the elongation wire with switch - so i can cut it manually every time there's even a slight suspicion something is about to go wrong

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[Eop]

a fuzzy science on old transformers 2

finding the optimum simple design for 9V linear adapter

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using std. parts 7805 , TL431

the load peak/-step response is somewhat unexpected here

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using low ß , high power switch (such as *MJE13003)

the load regulation stays below acceptable

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using bridged LM78L05 and LM324

fine tuning the bridge may induce better results this 1 however won´t pass because it´s load response

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same as above with an attempt to add a reference to be used in better line rejection ...

... can´t gain steady reference - won´t test all possible situations for such a noisy one = reference failure , halt, halt

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using low ß , high power switch* and random intuitive design

looks pass - tough i don´t know about higher frequency load responce

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[Eop]

a fuzzy science on old transformers

By the time it's gathered here a pile of transformers from the PC speakers , cordless & cell-phone loaders , modems , routers , X-mas lights , e.c. - some of which have their primary's overheating/over-current protections blown , for some i have replaced the 2-ry multiple or too low voltage windings with a single new 1 ...

the following table is apx. accurate within (more...less) ±...25...33... % which i find sufficient describing the multitude of transformers from different manufacturers and possible evolved...recovered fault conditions

the fuzzy science :: we find -
the lab./stat. avg. impedance of the 1-ry winding (2-ry open = apx.1MΩ(Vm))
the lab./stat. avg. voltage transfer ratio (2-ry open = apx.1MΩ(Vm))
the output voltage mutiplier for the rectified 2-ry voltage (2-ry open = apx.1MΩ(Vm))
the output voltage degrading coefficient for the rectified 2-ry voltage with load (25...330 Ω , 47uF filter)
the estimate (based on above) for 1...10k Ω loading of the rectified , filtered output (on the 2-ry winding)

so the table list below rectified , filtered DC voltage values estimates against the load resistance :
the percentage (parenthed) = P.OUT / (P.IN - P.OUT) @ est.-d  P.OUT.Max

the .CC is operational Nokia (Type: ACP-7E) 3.7V cellphone charger´s TF

.C10 is ® while .C60 , .C70 and .230 have the replaced 2-ries
.ZHN28 is from the incandescent X-mas lights rectifier from China

[Eop]