using 1N4148-s as capacitors

Small 1.2V 140kHz oscillator ::

the grid has not been especially optimized nor made stable against any power-,load-,temperature changes - nor has there been any real world tests of this particular grid (the feature however showed up in a real-world microbe-hour blocking oscillator circuit where the double reversed pulse-diode (not the pulse recovery diode) - capacitors were used)
note. ① the 1N4148 is a pulse-diode ② the diodes that showed the capacitor effect were also pulse diodes but for lower frequency & power & with higher junction (dynamic-)capacity ③ there is no registered (by me) real-world occurrence for the 1N4148-s' acting as capacitors ))

the common cathode -►|◄- cfg. seems to be better than the common anode |◄-►| one , the circuit on the above figure uses the 3-ple diode -►|◄-►| capacitor - that was used prev.-ly in conjunction with quartz resonator (simulation) - in order to minimize external effects reaching the quartz. (see note ③)

about ::



3-ple diodes ▲

2-ble diodes ▲. . . ? no difference ? . . . ? metal[to]P is same as metal[to]N . . . ? as mean carrier density near the barrier ? or then that model makes no difference
 

2-ble BJT ▲

yet another constant current source

extends :: Re: Non real world Constant current sources Comparison

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32768kHz Qz. Resonator Osc. test/dev.

shortly i need to build a fq. counter coz the 1 built in in KYORITSU KEW1018 . . . "is not too fun to go"
to conduct some IR Comm and other strobed-LED experiments

for that we need a time setting oscillator that's fq. can be fine tuned . . . dev. snap-sh's

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the LM4250 or К(Р)1407УД2 (actually what i got) seems to be a tricky thing to set up right - it'll take a number of real world tests before an attempt to connect it to anywhere ...

blah blah blah . . .

there's some shit with setting up the LM4250 model ::
.cir - file :: LM4250.cir ◄ .include LM4250.cir
.asy - file :: LM4250_NS.asy ◄ [F2] or Insert New Component
Component - Value :: LM4250/NS ◄ . . . the 3-rd variant of naming your LM4250

2015-08-17 :: the LM4250/KP1407yg2 is actually quite easy to use (you only have to pre-balance/-offset it) if you use a component level model 

[EoF]

some OP-Amp based regulator check ups

Minimal

Improved -- It seems the LT1086-12 model sets up a little "Show"here . . .

No concert v. -- although it simulates fine /!\ there'll be a point of concern selecting the proper xx78Lxx as the one i got was "factory tuned" to something 12.4V ((+3.3% systematical ? = no problem - the datasheet specifies ±(5% systematic ±0.75% line- (±0.417% load regulation)) =/!\ 12±0.74V )) . . . while the above grid shows some 9±0.00003V load regulation (which in practice should be expected at least 10x worse OR ±0.0033% load regulation) . . . blah, blah

Dual Op.Amp v.

SN7400 RS to "Old style" T - trigger

minimal counter configuration experiment ::

?! it's even possible . . . in theory . . .

+MMXV-02-08 the pulse T-trigger speed test
- thought to run this test in real but . . . what's the point -- it'd take also to build/test/verify a 15M detection circuit - that'd be more complex than the one below . . .

notice the complexity differences in between above and below circuits -- the speed difference seems to be roughly 1:3 . . . such as does it weigh up to gain some more speed by this "investment" , becides pushing the chip to it's limits increases the likelihood for errors

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! Update 2021.08.01 :

found an error in the above circuit , a repair as a   (at the input the XOR must be faster than the NAND-s or the NAND-s should be delayed to be slower for proper operation)

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[Eop]