father (Darth Sidious ;p) asked a "Stupid Question"

as why the automotive cellphone charger finishes much quicker than the wall supply
heres what i came up with (though i'm not so shure about it)

Simplified Battery Charging

related formulas ::
(*) -- ! not proven !

E(J) = Q(A·h)·ε(V) ΔE = dt·P(W) ΔQ = I·t dQ(A·s) = dt(s)·I(A)	ε = a·rb = E/Q Δε = a·Δ(rb) = Δ(E/Q)	P = U²/r = I²·r α²Q - αE = 0 (Q/QMAX)² - (E/EMAX) = 0 (Q/QMAX)² = E/EMAX (*) Q² = Q²MAX/EMAX(=ϰ) ·E E/Q = Q/ϰ	ε = a·rb r = (ε/a)1/b
(E=)Q²/ϰ - Q·ε(=E) = 0 Q/ϰ - ε = 0	E = √(ϰ·E)'·ε √(E/ϰ)' - ε = 0 E = Q·ε ε = E/Q =  Q/ϰ	ε = u + U = i·r + U εTF = i·rTF + U ε℩B = i·r℩B + U	εTF - i·rTF = ε℩B - i·r℩B εTF - ε℩B = i·( i·rTF - i·r℩B) i = ΔεX/ΔrX

[EoP]

1x versus 2x (AA) powerable SCS switch simulation experiment

the goal was to study a possibility using the SCS bi-stable switch for a memory element (trigger)

it seems the 3.8V is here a critical lower limit below what the implementation of anything gets very difficult -- determining the operating range & conditions
a somewhat complete test : timer : driving pulse former : electrical switces : 1bit RAM : readout buffer -- 1x AA schematic
(an old thing revisited) here the critical voltage is around 1.8V - to drive next switch without pulse amplifier -- 2x AA schematic

and thats it for now -- btw. incase you want to build any of such you need to separately tune/verify. each trigger-stage -- 1-st as an input 1 then as an output one /!\ besides , the set of any number of , may form a closed system (so that adding a stage may require retuning the entire N+1 stages) + trivia -- you also need to verify error free operation under varying supply and specified frequency×duty combinations (and even then you still may expect occasional transition failures for 2x AA v.) -- so if you need a complex app. use commercial "pre-tested" logical circuitry (each variant of witch requires a specific measures to gain an error free operation also ...)

about some LT Op.-Amp.-s

I usually don't use OpAmp.-s in simulations but when there's a need for comparator or dif.-Amp then using one'd decrease a setup time significantly ...

... i've noticed that not in all situations i've used a proper OpAmp for the specific parameters in that spot of the grid (rather "worked somewhere else" → "should work in here")

so here's a ::

Selected Pick , Fastspec.
LTC2054	V.S (±V)	SR (mV/µs)	GBW (kHz)	R.L (kΩ)	ROLE	LTC2054
LTC2055	1.35 , 3.5(6HV)	500	500	5 , 100	LoVtg 150µA ZroDrft-INA	LTC2055
LT6013*	V.S (±V)	SR (mV/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT6013*
LT6014²	1.2 , 20	100...200	0.9 , 1.6	2 , 10	150µA INA² +	LT6014²
LT6081	V.S (±V)	SR (mV/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT6081
LT6082	1.35 , 3.0	1000	1.5 , 3.6	(6,) 10 , 100	LoVtg 330µA uPoutp R2Linp Imp-INA	LT6082
LT1366	V.S (±V)	SR (mV/µs)	GBW (kHz)	R.L (kΩ)	ROLE	LT1366
LT1367	1.8 , 18	...130...	400	2 , 10	380µA *PWR , A , D	LT1367
LT1112	V.S (±V)	SR (mV/µs)	GBW (kHz)	R.L (kΩ)	ROLE	LT1112
LT1114	1.0 , 20	160...300	450 , 750	2 , 10	400µA SuperINA SG* uP	LT1114
LT1097	V.S (±V)	SR (mV/µs)	GBW (kHz)	R.L (kΩ)	ROLE	LT1097
	1.2 , 20	100 , 200...	700	2 , 10	400µA INA , uP( A , D , P )
LT1012	V.S (±V)	SR (mV/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT1012
	1.2 , 20	100 , 200	1.0 ?	2 , 10	400µA near-R2L-INA
LT1881	V.S (±V)	SR (mV/µs)	GBW (kHz)	R.L (kΩ)	ROLE	LT1881
LT1882	1.2 , 20	500	400 , 850	1 , 2 , 10	R2Lout 1mA INA	LT1882
LT1884	V.S (±V)	SR (V/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT1884
LT1885	1.2 , 20	*0.25 , 1	1.2 , 2.2	1 , 2 , 10	R2Lout 1mA OpAmp *←	LT1885
LT1211	V.S (±V)	SR (V/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT1211
LT1212	1.1 , 18	*4	*8 , 14	0.5 , 2.0	General(/DC→INA) 1.3mA OpAmp *←*←	LT1212
LT1677	V.S (±V)	SR (V/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT1677
	1.5 ? , 22	*1.2 , 2.5	3.7 , 7.2	0.6 , 2 , 10	R2Lout 3.1mA LoNz-OpAmp *←
LT1813	V.S (±V)	SR (V/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT1813
LT1814	1.25 , 6.75	*125 , 750	*50 , 100	1 , 2 , 10	→DC← 3.6mA *←*←	LT1814
LT1360	V.S (±V)	SR (V/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT1360
	2.5 , 18	0.25,*450	*32 , 50	0.15 , 0.5 , 1	→DC← 6mA 50MHz *←*←
LT1028	V.S (±V)	SR (V/µs)	GBW (MHz)	R.L (kΩ)	ROLE	LT1028
LT1128	4 , 22	4.5 , 15	*11 , 75	0.6 , 1 , 2 , 10	9mA Low-noise *←*← Sgn-Cnd'g	LT1128
! Notice that the given supply range lists the least of the values the OpAmp might be start working at and the upper most limit the OpAmp still might be working at /!\ for example :: for the LT1028(1)/LT1128(2) is shown V.S (±V) = [ 4 , 22 ] ← here V.S = ±4 V is valid only for(1),(2) @ [ TA = 25°C ] also the Datasheet shows Supply.Lim = ±18V** ( for V.S.Abs.Max ±22V [ TA = ... 105°C ] ) and Supply.Lim = ±16V ( for V.S.Abs.Max ±16V [ TA = ... 125°C ] ) Note! : ** -- shows a testing range some 80% of that of the Abs.Max value ↑↑ /!\

DB3 Test

Voltage Regulator Tests with OpAmp

Barely confirmed ::

features :: increasing 78L05 range , adjusting LM317 with virtual ground
[EoP]

Random Voltage Regulator Tests

Random keywords : stability, efficiency, ripple, startup time, slew rate, deviation :::

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(Added 2015-01-10) LTSpice Src ...

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[Eof]