Misc.

Rewired the old 3V Li-Cell-Button battery fed X-mas decorations -- those batteries are not cheap and have a too low capacity for LED-s . . . also i just got an unused Nokia AC-3E charger !
Theres 2 figures in series connection (2x  LED-s -- 1 per figure) -- since the least energy gets lost that way -- here what got implemented :

the next i found too complex to build for this simple task (where actually a properly chosen resistor would do fine . . .) -- but i wanted to check the circuit in action (which i rarely do) -- so the above v.1 worked fine with no modifications required (with 1Ω resistor as originally designed for 14mA actually drawing 10mA -- no much difference -- the dimmer might be and better as it won´t "jump into your eye")

... the creep itself ... in action XD ...
. . . the crystal balls´re not from the original set . . .

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i actually researched the cc design-line further for Op Amps as i attempted to control 555 charging cycle as shown below . . .
. . . and the best results (for misc. cc - sink) gave the next weird setup (no good for PWM or pulsed setup)

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C-MOS - op. amp. capacitor charge control - a concept design . . .
! update 2017.01.04 17:08 UTC+2h ↑↑
(with no big difference)

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unusual use of 555 timer in phase shift osc. setup . . . the modulation input - has no desired effect here - coz lowering the upper trigger level dis-balances the charging currents that'd need to be cc sourced - but for 500kHz i didn't wanted to extend the test for here . . .

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update 2016-12-21 14:38 UTC+2h (-2h UTC) ::

opti´ng the timer out of the circuit ???

 ? there seems to be no lower limit but the capacitors´ manufactured and what you can afford

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[Eop]

LMx39 CLM Test

since the Philips didn't provided the internals we assume it's about LMx39 ! ???

Capabilities . . . ! Optimistic . . .

The next requires a fixed supply , no aging / temperature drift of the components (or very complex / fast auto adjust to . . .)

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[Eop]

555 component level model test

555 as RS trigger

555´s behavioural model Ring Counter ?? 5MHz

555´s component level model Ring Counter

Self-loop-back Oscillator . . .

. . . finding the limits

Re-trigger from timing capacitor

Re-trigger from merged threshold inputs

Re-trigger from low going output

Simple PWM -- there´s a Clock triggered CC v. of it in a prev. post -- but the CC clock triggering showed out multiple problems with this component level model (which are more easy to overcome using hardware other than 555 timer) . . .

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[Eop]

PWM Test

Pulse width modulator based on LM311

Resistor adjusted

Automated - Sine-wave drived

Functional description ::

• LM311 :: U1 - voltage to PWM modulator , U2 & U3 - LED drivers
• LM324 :: U9 - Supply median , U4 - OpAmp´s virtual ground (internal to self) , U5 & U6 - Quadrature oscillator , U7 & U8 - Level shifter (for crap Cos outp by LM324 "OpAmp?") , U10 - LM324/Cos(αt) to R2R extender (for a Spice experiment)

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Pulse width modulator based on NE555 - from datasheet

. . . revised (Update!)

. . . as i realized the most likely principle of operation of this modulator on datasheet for this crap to work right requires the modulating voltage to be pre-adjusted to inverse function of :
f(m) = m^(1 + Pi × m) . . . ? lets see . . .
exp(f()) = exp((1 + Pi × m) × ln(m) )
f() = (1 + Pi × m) × ln(m)
m = f.inverse(f().valueOf())
. . .
-- i guess my 311 PWM (in the 1-st & 2-nd circuit-fig. in this post) is a better choice
. . .
checked the backgrounds of the prev 555 PWM v. "failure" -- added constant current charging , adjusted capacitor/modulation vtg. threshold levels . . . seems working

to adjust the circuit to operation the lowermost modulation vtg. level must be set so that the break per clock still occurs ... and the capacitor value so that at the uppermost mod.vtg. level the break occurs before each next clock (requires 2-ch scope or a digital error detector -- perhaps such where clock increases the counter and OUTP resets it -- so whenever the count reaches 2 the capacitor value is too big)

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[Eop]

Old Op Amp test PPM dcVC check

5V operation of LM358

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pulse position modulated direct current switching voltage converter QC

! likely source® http://www.24vpower.com/dianlutu/89.html

converting it to 20V to 5V variant

. . . adjusting switch turnoff time ... down to about ~ 100ns

no further checks (e.g. output short circuit , load steps , starting at mild overload ... )

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[Eop]

К554СА3 component- versus LM311 behavioural model

null

 

(in simulation) tested up to 2.5MHz
К554СА3 starts operating ?normally below 1MHz

[Eop]