Comment by periblepsis on Core memory output line question
Start with this YouTube video -- lesson 1. And then, if you care, buy some cores and a board from him. He's gold on the topic. You will have to contact him via here to get some. They aren't listed as...
View ArticleClik here to view.
Answer by periblepsis for Transistor switching speed
I won't go further than a very simplified (1st order) model of what's going on to help develop a meaning for \$f_t\$. There are higher order models. But to a first order the following approximation...
View ArticleComment by periblepsis on I am running 10 kVA alternator from 10 hp motor and...
Please draw out a diagram with all the functional blocks from the solar panels themselves all the way to the final circuit that generates the 220 VAC at 50 Hz. Show boxes for each block and...
View ArticleComment by periblepsis on DRV8835 motor kickback affecting quadrature encoder
Please with the schematic! Also, I wrote calibration software for critical medical devices -- a whole experience by itself -- with infusion pumps running anywhere up to 250 rpm with 512 A and 512 B...
View ArticleComment by periblepsis on What happens when the feedback loop is also...
@JuanAldrey Colin is mistaken. C5 doesn't block DC signals. If Vin is left open, then the opamp output is 4.5 V. If Vin is grounded, then the opamp output is about 410 mV. So DC certainly isn't blocked.
View ArticleComment by periblepsis on Bypassing a filament cartridge chip / Logic...
Did you buy this directly from the manufacturer? Have you called (or otherwise communicated with) the manufacturer to find out what they can do for you to solve this problem? If they are refusing to...
View ArticleComment by periblepsis on Tuned Gain Stage
Are they asking about the exact case where \$X_\text{L}=X_\text{C}\$?
View ArticleComment by periblepsis on What type of transmitter to use for a magic wand?
@kovac It's just random guesses, then. We don't really know much and there are too many possibilities. Shrink the problem to help manage the range. I can't answer about the right technology without the...
View ArticleComment by periblepsis on Identifying transistor topology in discrete phono...
@cubix Q1's circuitry does the RIAA work. I'm not interested in working out the details for that aspect. So I'll ignore it. Q2 and Q3 are in class-A. You can see something similar in something I wrote...
View ArticleClik here to view.
Answer by periblepsis for Can someone explain the working principle of this...
Always consider redrawing the schematic. What you have is exactly the same as this:simulate this circuit– Schematic created using CircuitLabAssume the solar cell, when lit sufficiently, produces more...
View ArticleAnswer by periblepsis for How does the HV supply of the MightyOhm Geiger...
I think that pin 3 must be HI when \$Q_1\$ is active. This happens right away because \$C_3\$ is initially discharged and therefore the internal RS FF is actively being SET. The base of \$Q_1\$ can't...
View ArticleComment by periblepsis on What's the purpose of resistor in series with...
@Alexander If you don't populate the resistor at all then the opamp may have a peak and oscillate at some uncontrolled high frequency based on the opamp. If you populate a zero-valued resistor, then a...
View ArticleComment by periblepsis on Measured gain 10x higher than calculated gain -...
@littleWoodster I get gm about 0.0325 so a gain of about 18, using spice params and the DC quiescent point. Vgs = 2 V, Vth = 1.6 V. ID about 13 mA, so gm = 13 mA / (2 V - 1.6 V).
View ArticleComment by periblepsis on Feeding boosted voltage to power pin of logic IC
I haven't tried to use this x14 schmitt before. But at a glance, it might be something to consider designing around. Looks interesting enough that I'll be looking closer at it later this week. Might...
View ArticleComment by periblepsis on In flip flop datasheets, why is the clock input...
@toolic Peter is right. I've seen if written out explicitly many times. But decades back when the target audience needed such explanations. Would have to go back and find old books or periodical...
View ArticleComment by periblepsis on Need help finding transistor P/N:H5101h
What's the package (show photo, if necessary) and what type of transistor is it?
View ArticleComment by periblepsis on 24 V safety advice, please
Why do you need to run the 230 VAC below the water line? Is there some reason you can't run only 24 V under water?
View ArticleComment by periblepsis on Calculating the differential equation for a 1...
@BenBockhoff I just saw this. Do I take it that you are not looking for the Laplace transfer function for vout/vin. But the differential solution equation in the time domain? Because they are quite...
View ArticleComment by periblepsis on Aviation headset microphone amplifier circuit
Microphone datasheet is here. Also look over this page's figure 4 as well as other pages there.
View ArticleComment by periblepsis on Low pass filter with Sallen Key topology
Solderless breadboards??? 8th order filter??? How did you arrange the Q of each stage and order them?
View Article