LM393 CLM TEST

LM393 speed test with a dynamic output voltage divider -- gives a best high speed sense range for the 5V supply

the divider (conditionally --and/or-- very approximately ) corresponds to about a single 3.6kΩ pullup resistor (or speculatively to about 1mA max. sink current at high frequency = (5 - 1.4)·1V/3.6kΩ)

---

An experimental javaScript Output Voltage Divider Calculator

---

Voltage Divider - Calculator

---

The Browser Detected ...
window.top.navigator.appName :
window.top.navigator.appCodeName :
window.top.navigator.platform :
window.top.navigator.product :
window.top.navigator.appVersion :
window.top.navigator.userAgent :
window.top.navigator.userAgent (about guessing the Browser) :
V_CC :
U_HI :
U_LO :
I_SNK :
Integrity of the entered data :
R₁ :
R₂ :
R₃ :
R₀ : -- R0 = R1||R3

---

Usage :: R1 to R3 correspond to {r1} to {r3} on the Fig. above

 

See also : the formulas for the Voltage comparator's resistive output delimitter

---

Summing it up ::

---

[Eop]

revised my LM393 CLM-s

using two types of test ::

about ::

---

[Eop]

Improving LM339 + "tunable" osc variant

► the tunable osc. as by selecting the RC net-wk

► the tests that lead to (as by what i've tested so far) "improved" v. of LMx93

► 2MHz - TEST (driven from realistic src. 74HC04 -- 1 gate has just about the power required!?)

---

[Eop]

Couple of osc.-s based on LM339 planned for 2x AA voltage converter

the bad thing with the next is the threshold levels're floating with the supply voltage and specific set of components (makes it difficult to wick the reliable PWM out of it) . . . the concept design → ▼

INPUT below Negative rail - oscillator ▼

---

[Eop]

theoretical experiment of 3 to 12 V boost converter

Simple , minimal ::

. . . with error as switch gets near constant 18mA to it's base due xa should be xi

however using cascade drive for switch poses problems -- also a good definition method for vc2 (LMx39/x93 OUTP)

some fixes -- no change . . . need to opt. the drive power usage


[Eop]

LMxx39 Circus + 750ns & - 900ns Zero Cross

Circus

Ti provided Pspice thingy for LM339 (is annoyingly ▲impractical▲) + (some of the chip names might be erroneous) -- anyway a good question here is why that cfg. doesn't generate "timestep too small" error . . .

Ti LM339 behavioural model as the bottom plot -- interestingly -- the closest match to prev. does not appear to be the right transistor circuit - the LM239 - but instead my experimental design as LMx39 (respectively LM293 and LMx93 in simulation circuit - both are the component level models e.g. the sub circuits) . . .


Cross the Zero +700ns

making the src. (whitch is yet another variant of the Lim.- or the Window comparator) more practical

Cross the Zero -900ns

using the "slope detector" - the right - first occurring comp.-pair signal can be passed to outp (removes the "echo")

[Eop]