Comment by periblepsis on Why does the opamp output not swing to vdd or vss...
Looks like the gain of your system is \$A_v=\frac12\$ to me. And in this particular case (odd coincidence) \$R_5\$ is carrying no current at all. Why don't you write with a little more detail about...
View ArticleComment by periblepsis on Checking battery capacity of 7 amp 12 volt AGM...
@Neil_UK Just reading, it seems that the specification wasn't at all exceeded. In fact, the questioner appears to have gone out of their way to make sure that they were close, but under, the spec. If...
View ArticleComment by periblepsis on Single-core-wires: should sharp turns be avoided?
Sharper corners cause a very small number of electrons to accumulate (DC) and/or vary under AC so they can "bend" the current just right to bend around the corner perfectly (make the corner so to...
View ArticleComment by periblepsis on For a disabled person's ring, how might a switch be...
For something like this the design and partners you will need are extensive. And complete -- and I do mean complete -- details would be required. Vague phrases like do its thing are the diametric...
View ArticleComment by periblepsis on Would a current pass in a resistless wire, like a...
Have a look here. They discuss details.
View ArticleAnswer by periblepsis for How to solve current mirror with emitter degeneration
In your degenerated diagram, the left side PNP is diode-connected. So to a first order, you can treat it as a diode in series with the two resistors of \$1\:\text{k}\Omega\$ and \$18\:\text{k}\Omega\$....
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Answer by periblepsis for Audio amplifier for school project
You should have been able to quickly spot this:Note that there are very strong hints there. There are three current sources already identified for you. And they are all tied into the same diodes +...
View ArticleComment by periblepsis on Simple Circuit To Bypass Preamp When Battery Fails
Or design for two batteries or use one with more capacity.
View ArticleComment by periblepsis on How to offset a sinusoidal voltage centered at 0 V...
May as well add datasheet links: LV25P and LA55P.
View ArticleComment by periblepsis on Convert PWM negative signal to either On or Off signal
Document the pwm signal thoroughly and what distinguishes "present" from "not present".
View ArticleComment by periblepsis on Experiments with Tesla coil
I'm curious what theoretical considerations would you use and how would you prioritize them in order to design a system using water for your stated goals. Let's start there. Maybe then an answer might...
View ArticleComment by periblepsis on Resetting d type flip flop with a trip signal after...
Wali, you can do all this with a couple of transistors, one bjt and one fet.
View ArticleComment by periblepsis on LEDs fail. Divern by CC BJT driver
@MMG Those are IR LEDs. Their operating voltage may be around 2 V each at the high current (should be less than a RED LED.) But I don't know because there's no datasheet or part type shown. Regardless,...
View ArticleComment by periblepsis on A simple question about differential receiver circuits
@softcalculate You know that the (-) input of the opamp should be the same as the voltage at the (+) input. If so, what current would be present in R1 and what direction is the arrow of that current?...
View ArticleComment by periblepsis on Differential amplifier Q point
@exolune The current mirror will attempt to have identical collector currents. This won't be strictly true (base currents for both come from the right side and ROUT on the left side is another...
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Answer by periblepsis for Differential amplifier Q point
Your circuit can be simplified and made pretty easy to quickly guess about:simulate this circuit– Schematic created using CircuitLabNote that I've started out dividing in half the current source at the...
View ArticleComment by periblepsis on Is my solution to this differential receiver...
@softcalculate You know that the (-) input of the opamp should be the same as the voltage at the (+) input. If so, what current would be present in R1 and what direction is the arrow of that current?...
View ArticleComment by periblepsis on How to isolate nickel-chrome wire?
Khalident, Go to the Cotronics web site and find what you need there. They have exactly what you need to use. And the pricing is fine and the quality excellent. Unless there's something you didn't...
View ArticleComment by periblepsis on How to make this high side current limiter more...
@learnvst This EESE answer provides methods for using datasheets and calculations to achieve a desired goal in predictable and thermally stable current control. It also exposes some...
View ArticleComment by periblepsis on Accurate intensity control of IR LED on ultra low...
Accuracy means traceable calibration to standards (NIST, DIN, etc.) Precision is a different thing, entirely. If you have good precision then an adjustment can bring in good accuracy if you have a...
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