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Answer by periblepsis for Dependent Source LTspice
contextThere are two kinds of dependent current sources in LTspice (and this applies to all Spice programs.) These are F (current dependent current source) and G (voltage dependent current source.)You...
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Answer by periblepsis for Third-order RC filter derivation
Three possibilities that come to mind but let's focus on this one:simulate this circuit– Schematic created using CircuitLabThis schematic has a traditional pair of zeros and three poles. It also...
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Answer by periblepsis for Increasing current biases of multistage amplifiers
bias current for second stage of amplification must be more than thefirst stage and so on third more than second why is that?I'll try to answer that. I'll be quantitative about it.My guess is that it...
View ArticleComment by periblepsis on Question about class A amplifiers
@freecharly I've no idea if the questioner is an experimental physicist, but if so I agree with you. So much of what an experimental physicist does can't use off the shelf commercial products and has...
View ArticleComment by periblepsis on Can somebody explain to me how this circuit...
I think the questioner also has another hole in their understand based up this: "I can’t understand how the heck the PNP let’s through current at only 5 V if Vin was let’s say 12 V". They probably need...
View ArticleComment by periblepsis on Question about class A amplifiers
@SleepingOwl132 Glad to hear it helped!
View ArticleComment by periblepsis on What is the name of these old colored indicator...
@NoelWhitemore They were, then, incandescent. But they do need to be replaced from time to time and take a fair bit of power to be visible (emitting a lot in infrared and as heat.) No LED can really...
View ArticleAnswer by periblepsis for Why is the gain of the amplifier not considered in...
Why is the gain of the amplifier not considered in the frequencycalculations?In simplest terms, it's because they are looking for a relative value when they write "3-dB-frequency" (which means...
View ArticleComment by periblepsis on Simple doorbell circuit using transistors
@MondeAlbevar I agree you should increase the 27 Ohm resistor by a factor of 10. A piezo (buzzer) is net-capacitive. A speaker is net-inductive. They have opposite reactance sign. There is a reactive...
View ArticleComment by periblepsis on If using a dryer that runs on 120V, is a 240V...
Jon, it's always a good idea to balance loads across the two split phases, when possible. If it is likely that you will run both the washer and dryer at the same time, then having the washer on one...
View ArticleComment by periblepsis on is ltspice AC analysis trustworthy at RF when using...
LTspice just works. If you know what it is and does and doesn't do. I see no specific schematics showing a case you feel is inexplicable. I see words. And I may or may not follow them accurately. But I...
View ArticleComment by periblepsis on RC filter cutoff and impedance
Malum, the output of the LMC6001 isn't 0.07 Ohm. Where do you get that figure?
View ArticleComment by periblepsis on Calculation of transistor values using hFE
@Mhan I don't see a DC bias at the base. Just a pulse. The transistor needs a DC quiescent point as well as proper AC design. That's two different things. All you seem to have done is provide an AC...
View ArticleComment by periblepsis on How does this ramp generator circuit work?
The text tells you what the zener does. It's a zero-TC zener family (cool!) and it has 6.2 V across it. What can you work out from there? It's kind of easy to see. So I'd like you to look closely at...
View ArticleAnswer by periblepsis for Trying to figure out rise/fall times for different...
I'm not putting in a lot of thought. Just the surface moments of about two minutes time...A 40-60% duty is required. That is 3.2 ns to 4.8 ns out of an 8 ns cycle time.If the worst case spec you have...
View ArticleComment by periblepsis on Proof of ripple voltage of capacitor filter?
Plague, you have neglected to include the calculation for \$T_1\$.
View ArticleComment by periblepsis on Reasons for implementing op-amps which are not...
Math, just another thought. The very worst possible case for stability is when you have maximum feedback to the (-) input, which is when you use a wire to connect the output to the (-) input and get a...
View ArticleComment by periblepsis on How to Convert 16 bit to Decimal on Multisim?
Are you saying that you have 16 bit binary data and you want to display it in base-10 format? If so, you may want to consider the double dabble method. Here's what it would look like for 16 bits.
View ArticleComment by periblepsis on A basic question about loop gain and stability
Jim Williams writes on page 377 of Analog Circuit Design that, "As a rule, if \$A\,\beta\$ is equal to or more negative than -1.0, the circuit will tend to be unstable; this can happen if the sum of...
View ArticleComment by periblepsis on Is the resistor between the clock and the NPN needed?
Yes, use the resistor.
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