Comment by periblepsis on A logical way to remember the direction of current...
@Ak2399 If I short the Thevenin, I just ask myself which way does the current go in the voltage source. Clearly, upwards and out. So the equivalent Norton current source will have an upward arrow. If I...
View ArticleComment by periblepsis on how to limit current from battery?
Sounds to me you could almost do the PWM, manually with a switch. Hold it down for the first minute. Then just press it for a few seconds every quarter minute. Or get a bimetal switch. Cantherm makes...
View ArticleComment by periblepsis on Can I use my old mobile camera as dedicated...
I couldn't afford a telescope as a teenager. So I ground mirrors and lenses myself. Thousands of hours figuring and polishing. Three scopes, my last one an 11" Gregorian maksutov. 1/20th wave accuracy....
View ArticleComment by periblepsis on Alternatives to "resistive loads"?
You might start with Steinmetz and the Concept of Phasor: A Forgotten Story. It includes necessary references. I particularly enjoyed reading two of the referenced works published in 1897. Assuming...
View ArticleComment by periblepsis on Ltspice - Creating a new component from schematic
There is a lot of information about how to use LTspice to make new components in this EESE answer. Read through that and see if any of it help correct your problems. If not, I may give it a shot. But...
View ArticleComment by periblepsis on DC-DC Boost Converter Design with losses
You have 720 watts of power at the load, ignoring how it's delivered. At 100 kHz, this means 7.2 mJ delivered per cycle; energy acquired and released by the inductor. Assuming continuous mode...
View ArticleComment by periblepsis on What is the easiest way to make frequency...
Barrie Gilbert's MC1496 comes to mind. Here's a sample output with your two frequencies at 100% modulation (adjustable.)
View ArticleComment by periblepsis on Analysis of Capacitor Voltage in a Circuit with...
I was considering something similar and for the same reasons about what the OP wanted. Nicely handled. +1.
View ArticleComment by periblepsis on DIY Contact Mic Amplifier – Struggling with Noise &...
What exactly is the microphone part number/type.
View ArticleComment by periblepsis on Common-Emitter Darlington Circuit – Theoretical...
Manuel, Also please include a snapshot of the output signal showing 5 or 6 cycles across R3 and across R2, too. And are those ideal NPN transistors?
View ArticleComment by periblepsis on Op-amp with current amplifier
@efaa The bipolars, if not included in the feedback loop, actually reduce the voltage gain. Not by much. Perhaps to 98% or 99%. But it's not 100%. Also, Null's link and image shows a much better...
View ArticleComment by periblepsis on Problem with measuring the saturation voltage of a...
@wewqewqewq High level injection effects and ohmic resistance get conflated into measurements made at 800 mA. Not knowing the exact details of your procedure, I also worry about heating effects making...
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Answer by periblepsis for Common-Emitter Darlington Circuit – Theoretical...
you can't get there from hereWith your amplifier topology, the open loop voltage gain is approximately the quiescent voltage across the collector resistor divided by the quiescent voltage across the...
View ArticleAnswer by periblepsis for Forward voltage of the 1N4001 diode is not 0.7 V
Any forward bias with a diode, even a very small applied voltage, will lead to some diode current.Taking a look at your data table, it appears to me that your measurements with smaller applied voltages...
View ArticleComment by periblepsis on Can I use my old mobile camera as dedicated...
I couldn't afford a telescope as a teenager. So I ground mirrors and lenses myself. Thousands of hours figuring and polishing. Three scopes, my last one an 11" Gregorian maksutov. 1/20th wave accuracy....
View ArticleComment by periblepsis on Limited gain on BJT differential Op Amp
First time I've seen this done. Learned something new. ;)
View ArticleComment by periblepsis on Calculate Base Voltage in two-transistor current...
@jonathanjo Have you already read this answer. It covers almost everything you are asking for. Perhaps more than that.
View ArticleComment by periblepsis on Precision Signal Amplifier Circuit - 2Vpp to 200Vpp
You aren't going to get class-AB 20 Vpp from a 20 V supply rail. Some voltage margin is required. Especially at 20 watts! Also, define "minimal latency, low distortion, and high fidelity." And do you...
View ArticleComment by periblepsis on Charging time of a capacitor for a differential RC...
For sample and hold, you need several \$\tau\$'s. Not just one. How many will depend on the application requirements.
View ArticleComment by periblepsis on Find maximum and minimum between 2 and 3 Numbers
@erifaerifa By 2's complement do you mean signed? There's some ambiguity in usage, from experience. So I'd like to be sure about it.
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