about google found VCO-s

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src	mod
as i didn't use the default transistors i was not able to grasp the ® idea behind this mess	finally it best resembled to a phase shift OSC - what it is with a poor fq. ctrl
not a VCO but a Schmitt Trigger

. . . the response speed and frequency range define the possible target app.-s . . . as in fact what i did here was the opposing -- an attempt to find out best range for operation by VCO type (for the ones that didn't work from scratch . . .)

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[Eop]

Couple of more Schmitt's

the following circuit is actually an incomplete design halted in the middle ,
surprisingly it appears to work as is in a quite wide supply range ???

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this is the latest 1.2V v.
PS! -- what makes it exhaustively tedious to make any sense for unregulated or non-pre-conditioned single battery operation  are the BE CE voltage drops
e.g. the normal operating range for Si-BJT-s starts from somewhere at
( 1.2V !!! ... 1.26V ... 1.53V ... ) more likely above 1.86V
 - actually it's combining 3 different oprating ranges and optimizing these with 3 extra limitations
► <1.1V , 1.1 to 1.53...1.86V , above 1.53...1.86V
► + adding to this -- optimize the number of components (budget)
► ++ adding to this -- optimize the power (budget)
► +++ adding to this -- maximize the frequency bandwith (capable from static DC to HF operation)

near static I/O correspondence at operation from 1.2V supply

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[Eof]

Insane

Couldn't figure out non ~AC use for j-Fet ... bullsh¡t -- the DC setup for j-Fet at 5V supply allows it to be used as a 1-st high impedance stage at 4-stg voltage amplifier which is likely frequency dependent thus non-DC amp

so i combined what i had seen in web with what i'd learn so far . . . and we got a nice median of previous post

(whats it worth  ´>.<`)
[End of this bullsh¡t]

Verifying some web Schmitt trigers

1-st i attempted to make sense of

this beast (src.) . . . is the T3 right polarity? coz i couldn't get this thing to generate any useful output that way ... anyway there's what it end up :

and it's damn slow for dif. input stage -- where the good point is it's having a high impedance input

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2-nd we got something called CURRENT-MODE SCHMITT TRIGGER

or  PULSE_COMPLETING_SCHMITT

if it's an OE output -- then here some more realistic boundary for it :

it appears fast and even faster - but input seems to be very low impedance???

next i should try some j-Fet 1-s ...

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[Eop]