Comment by periblepsis on 2 pins vs 3 pins mercury lamp
Three electrodes on a mercury lamp would indicate to me a "starter" electrode, which is used to overcome the cold resistance and start the arc.
View ArticleComment by periblepsis on MOSFET amplifier design for THD < 1%
@LOCAITNOASL Do you seriously imagine getting below 1% THD with a mosfet CS stage, even with source degeneration?? (Which I don't see on your 1st stage and with no global NFB, either.) Perhaps study...
View ArticleComment by periblepsis on Hayt - Example 9.5 - 8th edition
Maybe there's an error in the circuit drawing. With the switch open (t < 0) and the capacitor inactive there are two branches, one with R1 and one with R2. Perhaps the wire in the upper right corner...
View ArticleComment by periblepsis on Submersible water level sensor vs. lightning
You've got the experience of others: "The sensors are supposedly sensitive to lightning (reportedly even if several km away). I don't fully understand the mechanisms at play, as the reviewer claims...
View ArticleComment by periblepsis on Lab power supply reference design
Your output current is a compliance. It can be zero. There is no way you get >90% efficiency down to zero amps. Also, from experience and my ignorance, I find LDOs a little harder to stabilize than...
View ArticleComment by periblepsis on Building microphone amplifier circuit
@MxMllr It looks like you understand it well enough. I take issue with your 6.3 Vrms. But don't feel like arguing about it right now. The CG pin is likely related to a sloppy (from datasheet range)...
View ArticleComment by periblepsis on What's wrong with my 1-bit subtractor (made from...
Perhaps it's just a matter of your own misunderstanding. When adding, if the carry out is a 1 then there is a carry for the next higher-order add section. When subtracting, if the carry out is a 1 then...
View ArticleComment by periblepsis on Fuel Gauge Recommendation for LiSOClâ‚‚-Powered...
Seems might similar to this question you asked. And I'd provide similar advice as I did there. I worked on the Sieko message watch many years ago. This would last 2 years on a single small battery. But...
View ArticleComment by periblepsis on Can someone help me solve this diode circuits?
I think, from the text pointing out that one AND gate is connected to another AND gate, that it is obvious a dot was intended at the node for \$V_{\small{O}_2}\$. Just a typo. Happens sometimes.
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Answer by periblepsis for How does this totem pole driver work for a high...
Can someone explain how the totem pole driver works to charge anddischarge gate capacitance on a high side P MOSFET?On the high side, the DC bias is set by the 2N3904 transistor, settingthe voltage on...
View ArticleComment by periblepsis on STM32L4 GPIO Pin Electrical Model
They are telling you that there's about a 400 mV drop at 8 mA. So 50 Ohms. At higher currents that will likely go up a bit and the drop won't be entirely linear with sink/source current.
View ArticleComment by periblepsis on INA851 to amplify Wheatstone Bridge and transmit...
I believe you will need to write a lot more about the situation.
View ArticleComment by periblepsis on UPS for RaspberryPi
@RabboniRabi Are you only taking and recording one set of environmental readings per hour? Are the data readings quickly collected? Or does it take time to take one or more of the readings?
View ArticleComment by periblepsis on How do you measure pressure using an ultrasonic...
This datasheet says it emits 117 dB SPL with 80 V drive (which I take to be peak to peak, but don't know for sure.) This would be 20 uPa*10^(117/20) or about 14 Pascals, I believe, at a distance of 30...
View ArticleComment by periblepsis on Flyback diode change caused instability on...
I believe there's a lower forward voltage drop in trench types and this would mean it takes longer during the flyback. That may be a problem. Stack two of them in series and see if the problem goes...
View ArticleComment by periblepsis on Why does this phase shifting network attenuate the...
Did you use an oscilloscope? And a 10X probe, for example?
View ArticleComment by periblepsis on Why is my band pass filter not working as expected?
EskimoJones, What exactly are you wanting to achieve? Is there some reason you want to use LM741? (They are wildly faked, though I suppose you could get lucky and get a good fake instead of a lousy...
View ArticleComment by periblepsis on Please Review My Numitron Clock Design
@FilipM Just a thought from above, so to speak. You've mentioned "I am fairly new to practical electronics and this project is mainly meant to be a gift for someone who admires the look of the vintage...
View ArticleComment by periblepsis on Why does my high pass filter not work
@EskimoJones I suspect this also relates to this other question from you. Talk about the application and goals. Or is this just about education?
View ArticleComment by periblepsis on Electret microphone amplifier problem
I agree with @AnalogKid about that resistor. Too low-valued as you've AC grounded the bias. Also, the supply rail is 5 V. Typically, 2-wire electrets are provided with 1/2 mA drive and drop about 1.5 V...
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