Comment by periblepsis on Class AB Amplifier with feedback
Anonymous, The NFB isn't arranged correctly. And there are other problems.
View ArticleComment by periblepsis on Class AB Amplifier with feedback
@greybeard Good enough. Let's go with that. Since I didn't give it a moment's thought. Thanks.
View ArticleComment by periblepsis on Voltage Reference of 1.65V for Bandpass using...
Manmeet, Just looking at the plot you are looking at a Q of 3 or more. In general, you don't use staged low-pass and high-pass filters for Q's higher than about 0.465 or so. Instead, you use integrated...
View ArticleComment by periblepsis on How to analyze this transistor stage (NPN + PNP) at...
@Angie Are you looking to be able to actually compute quantitative values using a simple bipolar model -- without the added complexity of an Early Effect? Because of Q2's reverse arrangement, it cannot...
View ArticleComment by periblepsis on 7-segment numeric counter that only displays...
Sequencing Sarah, The first two 4000 series FF types that come to mind are the these 4013 D-FFs and these 4027 JK-FFs. They each include both set and reset inputs so it is easy to start on 1 at POR...
View ArticleComment by periblepsis on How to generate a low/high level from a constant...
I see you are kind of rebooting your earlier question with some newly hatched direction to consider. No extra pins required, either.
View ArticleComment by periblepsis on Why does one implementation of an XOR gate with...
Dude, I discuss the motivation for the simplification from five NAND gates down to just four NAND gates here in this earlier answer. The details are there. I think you will see how it is done.
View ArticleAnswer by periblepsis for Using Kirchhoff's current law, how is this first...
You only have three unknown node values. Using SymPy (free) you may write:eqA = Eq( va/R1 + va/R2 + va/R7, v/R1 + vb/R7 )eqB = Eq( vb/R3 + vb/R4 + vb/R7 + vb/R8, va/R7 + vc/R8 + v/R3 )eqC = Eq( vc/R5 +...
View ArticleComment by periblepsis on Voltage divider rule + KVL on BJT circuit
@efaa You've provided no part values nor the power supply rail value being used. How are we supposed to agree or disagree with your emitter voltage of Q1? Also, you are discounting Q2's collector...
View ArticleComment by periblepsis on 7-segment numeric counter that only displays...
@MathKeepsMeBusy It will need to power up onto 1, somehow, if I'm reading the spec right.
View ArticleComment by periblepsis on Transistor calculations
Anonymous, Use the Ebers-Moll model, with an addition for the Early Effect if you want that included. It just works.
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Answer by periblepsis for 7-segment numeric counter that only displays...
A push-button is a notorious source of glitches as it settles one way or another. So it will need debouncing. Ben Eater's 8-bit computer uses a 555 for this purpose (also available in CMOS...
View ArticleComment by periblepsis on Amplifier Gain Equation
It's just that the output is 0.4 V * (1 + 80k/4k) - vs * 80k/4k. Or, put another way, 8.4 V - 20 * vs. That's before the buffer, of course.
View ArticleComment by periblepsis on How to get Rout
What do you get as the DC operating point for the entire circuit? No AC. Just the DC operating point? The DC operating point comes first.
View ArticleComment by periblepsis on How can I convert phase shift between two square...
@Kuba I am glad you and the OP think so. Before writing that comment I looked over some old notes first and then studied two masters degree project reports and theses containing still more mathematical...
View ArticleComment by periblepsis on Is it possible to drive an automotive solenoid...
@ninjaboy667 You've got several issues going at once. But for now I'd just like to zero in on the low hanging fruit. Replace your flyback diode with a zener and diode. Look up that arrangement on the...
View ArticleComment by periblepsis on Can voltage amplifier provide amplified sound?
@RajeshR You don't display the amplifier circuit. Usually, when there is no additional context provided, writing "voltage amplifier" is taken by assumption to mean a classical class-A, single-quadrant...
View ArticleComment by periblepsis on How to calculate power dissipation in Darlington...
Sebastian, You are talking about dissipating 100 W in the driven load. Your circuit is moving into class-C, from class-B. With a true class-B the best you can hope for will be something around 100 W...
View ArticleComment by periblepsis on What do I need to drive a 150 ohms headset?
Engel, You have some thoughtful questions for someone coming from a digital perspective and lacking analog design experience. You've done what study you can do with what knowledge you have on hand. So...
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