? Inductorless Flash-light energy efficient ?

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src. :: Single-Cell Programmable Constant Current Boost LED Driver

src. :: Питание Для Светодиодов (Started by vanPelt, April 26, 2012)

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Principal functional analog (or better)

 -- about the 500mΩ being enough to regulate the current

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[Eop]

revised the yy78Lxx 5V variants

tests so far ::
PS! -- although the following setups perform well the real tings may not coz the Spice models use highly accurate fixed current sources - - - while there's no indication the real 78Lxx-s had any implemented //// the last time i tested my real 78Lxx-s showed an ulta poor performance where the voltage started to drop already at !!!above 30-/40 mA drain and significantly differed from the nominal at 50mA (while i didn't notice them getting hot -- so that a possible thermal prot. feature could have had engaged ???)

partial apx. match to d/s ::

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[Eop]

Improved the К554СА3 model

some tests ::

PS! : because the low CE voltage drop transistors used i cannot guarantee the device will work down to that it does in simulations but i guess it does significantly below the specified ±13.5V

PS#2 ! : the LM311 model is obviously an over idealized one . . . is just included for the comparison

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! Update :: "Unlimited" frequency range oscillator

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[Eop]

Improving LM339 + "tunable" osc variant

► the tunable osc. as by selecting the RC net-wk

► the tests that lead to (as by what i've tested so far) "improved" v. of LMx93

► 2MHz - TEST (driven from realistic src. 74HC04 -- 1 gate has just about the power required!?)

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[Eop]

Couple of osc.-s based on LM339 planned for 2x AA voltage converter

the bad thing with the next is the threshold levels're floating with the supply voltage and specific set of components (makes it difficult to wick the reliable PWM out of it) . . . the concept design → ▼

INPUT below Negative rail - oscillator ▼

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[Eop]