Monday, January 8, 2018

Regulated single 1.5V AA Led Flaser Concept


there are different 2N3904 models the ones with 100mA I.F and the ones with 150mA I.F -- in REAL implementation of this circuit you may need to multiple parallel these for a switching transistor or use a more powerful low U.CE type one


PS! this is a simulation experiment - the real circuit and components for a similar output parameters may somewhat or significantly differ of those shown in the fig. !!!

about & how we got ↑there↑ ::

initial circuit
the op amp regulation promises worse results than the transistor regulation on the first figure

[Eop]

Saturday, January 6, 2018

Making working/alternate TC4405 model

TEST


CLM


Better than nothing OR the Microchip's model

[Eop]

Monday, January 1, 2018

Web Buck Remake

src. :: http://www.talkingelectronics.com/projects/LEDTorchCircuits/LEDTorchCircuits-P1.html

somehow it did not "work"/simulate too well
???

experimental/unfinished mod. :: with "pulse skipper" for low loads
/// i have no any idea at this point how one should tune the real circuit into proper operating mode . . .




[Eop]

Thursday, December 28, 2017

www voltage multiplier test

src :: http://electricalnote.com/symmetrical-dc-to-dc-converter-with-ic555/
(i donno why they have to post circuits in the web that add up to the climate warming ...)


mod/fix ::
(the circuit'd do better with true complement wave drive -- e.g. -- a RS digital flop driving two powerful buffers -- in our case -- 555-s)



[Eop]

Tuesday, December 26, 2017

the Actual/Built LED verifier

as i was not about to build a PCB for this the sot-jFets were not used . . .

Spice design ::

Real build ::


[Eop]

Friday, December 22, 2017

Comparing Constant Current Circuits (to sort/verify the LED-s with)

▼Fast/Simple/Robust/Trivial Op-Amp + BJT Setup▼
→ apx. 16mA ±30µA(0.2%)
[fig.1]
▼Complex/Trivial Op-Amp + BJT Setup▼
 → apx. 18mA ±24µA(0.1%)
[fig.2]
▼Simple/Experimental BJT Setup ( !? the Best ?! )▼
→ apx. 18mA ±60nA(0.0003%) 
[fig.3]
▼Full/Trivial BJT + N-jFet Setup ( also better than any op-amp variant ??? )▼
→ apx. 18mA ±300nA(0.002%) 
[fig.4]
▼Complex/Experimental Op-Amp + MOS-Fet Setup▼
(likely worse than it's BJT alternate -- the 2-nd ↑↑ fig. )
→ apx. 18mA ±120µA(0.7%) 
[fig.5]
▼Trying to get it right here▼
-- it seems that the op-amps should be fed from the separate supplies or otherwise the PSRR won't recover the precision reached at reference voltages
→ apx. 18mA ±48µA(0.3%) 
[fig.6]

((the work is in progress ...))

If you are stupid then knowing the right Op-Amp-s could save your day
(the node "SE" had the greatest error although the node "a0" has the least ??? -- about LT1012A)
→ apx. 18mA ±10µA(0.06%)
[fig.7]

-------- Update 2017.12.24 ::

▼a conditional opposite to "If you are stupid then knowing the right Op-Amp-s could save your day"▼

→ apx. 18mA ±7µA(0.04%)
 [fig.8.1]
a "Russian LM308" **
 [fig.8.2]
** it's nearest LT's substitute (so far)

[Eop]

Wednesday, December 20, 2017