Alternate for the BJT Flip-Flop

about :: the simple universal RS Flop has a deficiency -- "negative overshoot" at transistor bases . . . the quick fix would distort otherwise near perfect square wave ::

(the point here was to find an even charging/discharging capacitor based SW source not more complex the below Flop . . . since all such likely require fixed supply or much more complex circuitry the final option of TLV3691 or any substitute was selected)

. . . just checking the double T thingy for 50% duty clock source - but it appears to be requiring too strict tuning --and/or-- voltage source ::

Fortunately there exist a low voltage comparator (to cover that supply range ... otherwise any other SW source can be used) ::

+ a simple varying duty SW source test ::

and a better timed ones ::

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Testing Pseudo Capacitors

it turns out you can cook a lot of capacities out of bipolar triode

a descending list :: (also on the 1-st fig. below)

• connect E2E2C2C using bases as outputs or (equals) tie E&C together and merge B-s
• connect E2E & C2C using bases as outputs
• connect E2C & C2E using bases as outputs
• tie CB-s together and use as outputs merge by E-s
• tie EB-s together and use as outputs merge by C-s

(PS! -- the shown voltage tuning takes up to about a second to settle !!!)

+ a simple osc. test ::

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LM324 versus LM308 -- MM versus CLM

LM324 versus LM308 -- Macro Model versus Component Level Model

In small signal range the LM308 (an older design 1969) seems to have a half faster response than the LM324 (a newer design ?1972?)

signal shape dependency on input amplitude ::

the particular apx.-n of LM324 CLM is not too exact (but in some tests shows out a better performance than it's factory provided macro- (a "net list" .cir) model)

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modified a simple circuit

src. :: http://www.ti.com/lit/an/snla140b/snla140b.pdf (Fig.30)

mod. ::

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