Wednesday, April 26, 2017

sine OSC with incandescent bulb

dynamic light bulb resistance test ::

fuschia . . .


Tuesday, April 25, 2017

about 6F22

i was wasting some half a day to find out the max. safe discharge current rate for carbon zinc type
there was no such data avail.
-- so i had to make a best guess about

a fuzzy logic follows ::

it is statistical nonsense but since i had no other data avail than GP-s datasheet then what it seems / was assumed is that the average drain over longer time is somewhat constant . . .

. . . so if you want to design an application that uses 9V C-Zn battery then something optimal value is 12mA or below -- that is -- if it is to work 24/7

( it is amazing that we don't have that value available -- if you overload the battery it gonna heat up that first boosts the chemical reaction but likely roughly over 40°C (104°F) it starts to damage internal chemistry further on there might be acid or alkaline leak or explosion or even fire when Li-ion gets in contact with oxygen -- so all such totally insignificant stuff no one needs to know exactly -- especially the EE app. designers )


Monday, April 24, 2017





testing the Cool Bit OSC-s for seeming L.e.d.spk. measurement

actually for OSC frequency measurement ... anyway

made a real test with hybrid vid.amp ~ dif.amp circuit but it didn't work reliably enough to be sure of the frequency (so i hope one of the next actually'll 2 the 3-ck before i need to set up some opampsh¡t)

1-st Std. (modified)

2-nd -- an emulated tunnel diode (modified)

update 2017.04.25 :: some opampsh¡t


Friday, April 14, 2017

about google found VCO-s

Last to First ...

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 . . .)


Thursday, April 6, 2017

Random CMOS oscillators

a phenomenal TTL osc. at fig.3 in the previous post caused me to check if it's a specific or general situation . . . as expected it was a specific occurrence - - which left me time to play around with some new cmos RC osc. setups

what follows is a quick tune of such into operation to find out some of their speciffics . . .

it didn't get closer than that

random trivia ... this starts up pulsating - no data if that fades or not

capacitor only ver.

random reasoning - - min. "offsets" for R or C alone merged ???


Wednesday, April 5, 2017

Yet again another 1.2V logic variant

. . . in simulation - capabilities . . .

. . . i have a bad feeling that the CMOS substitute at the same speed would use multiples of more power . . .
speed test
counter -s test (ver.3)
CLK and internals
counter variants
(they all suppose to function the same . . . but it's !NOT verified!)
note: it's an inline image -- (R)click+(L)click [View Image] for full size
by: /image-to-data-uri-converter