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  1. D

    Sallen Key Low Pass Filter, bandpass filter

    Page 36 of https://www.ti.com/lit/ds/symlink/tl074.pdf?ts=1710167213287&ref_url=https%253A%252F%252Fwww.mouser.com%252F
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    I want to make a speed limiter for my motorcycle

    You might use the trigger sig to the CDI as its probably a low V and more suitable for micro interface. It may need R divider attenuation, and I would clamp the signal (after the divider), at the micro input. Adjust divider R's to produce spec logic levle input for micro. I would gate the...
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    16 ohm to 8 ohm quad box conversion

    Its possible, are there any crossover networks in speaker present ?
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    Science fair electromagnet suggestions

    https://www.sciencebuddies.org/science-fair-projects/project-ideas/experiment-with-electromagnetism https://www.weareteachers.com/electricity-experiments/ https://www.teachingexpertise.com/classroom-ideas/electromagnetic-activity/ Regards, Dana.
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    DIY fiber optics with LED/phototransistor pair, super glue, and PMM arts n craft fiber

    ESP32 coding, try this for a fast method of basic coding. Tuniot : http://easycoding.tn/esp32/demos/code/ The above a basic Network template example. But use as a basic part w/o the network stuff also easy. Tuniot takes your basic block configuration and generates C/C++ code to program with...
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    Op Amp Circuit Gain Does not Match LTSpice Simulation

    Thanks Ylli for catching that, here is updated schematic : I checked the phase margin, that looks OK as well. Regards, Dana.
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    Question about DC current flow

    NO. DC uses whole cross section of wire. Its AC that has what is called skin effect, where current tends to flow towards outside of wire. https://www.allaboutcircuits.com/textbook/alternating-current/chpt-3/more-on-the-skin-effect/ Regards, Dana.
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    Op Amp Circuit Gain Does not Match LTSpice Simulation

    Using a R-R OpAmp we get some better results : Choice of OpAmp dictated by what was already in sim, eg. spice model. A general purpose RRIO OpAmp will pretty much do. Note slew rate of OpAmp shown probably a little light, you need something on the order of 1.25 V/uS min for 20 Khz input...
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    Op Amp Circuit Gain Does not Match LTSpice Simulation

    Is this more what you want ? Regards, Dana.
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    Op Amp Circuit Gain Does not Match LTSpice Simulation

    1) Does input have to be DC coupled ? 2) What is input range pk - pk and is it always ground referenced ? Sorry if you have already made that clear, I keep re-reading and not sure.... Regards, Dana.
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    Op Amp Circuit Gain Does not Match LTSpice Simulation

    Here is stepping R3 from 2K to 8K, effective increase offset. Regards, Dana.
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    Op Amp Circuit Gain Does not Match LTSpice Simulation

    Here is no offset, 1.15 sim, correct OpAmp
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    Op Amp Circuit Gain Does not Match LTSpice Simulation

    When input is DC swept from 0 to 12 V you can see effective range is ~ 9V. Also note at 0 V in a problem getting emitter follower shut off. Regards, Dana.
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    Op Amp Circuit Gain Does not Match LTSpice Simulation

    Your input to OpAmp is ~1.56V. Your fdbk R6, R3 sets G thru NonInv OpAmp circuit of ~ 1.5. The output stage is a G = 1 (its an emitter follower), so output would be 1.5 x 1.56 ~= 2.34V. And your OpAmp is running into the rail (clipping) with the 8V offset at Vin. The OpAmp output swing is...
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    Using Arduino with AD7730 ADC

    You meeting the specs I posted in post #2 ? Does datasheet call out startup conditions for 7730 that have to be met before part produces valid data ? Regards, Dana.
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    Using Arduino with AD7730 ADC

    Your master clock for the 7730 : Page 32, 33 for clock generation. Regards, Dana.
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    Identify this diode.

    Could be a diode, a zener..... If you hand draw a schematic it might be possible to figure out its purpose. Regards, Dana.
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    Value of this capacitor

    Generally a film cap, polyester, teflon...... Regards, Dana.
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    LED Circuit for Electric Fence Light

    Electric fence V, at only leakage levels, in the 10 kV range. If you load it with LED kinds of current the fence operating V will drop significantly. A cheap HV diode could be microwave oven diode like : You also have a problem with resistors that can withstand HV w/op arcing, so use ones...
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    Simple Hall sensor alarm circuit?

    Circuit 1 where is pic or datasheet doc you found this in ?
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