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2 votes

Unity-gain bandwidth circuit with uA741 op-amp

It is possible to increase BW by adding more stages. For op amps with a GBW of 1 MHz, replacing one stage which has a gain of 100 with two cascaded stages each having a gain of 10 increases the ...
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2 votes

Unity-gain bandwidth circuit with uA741 op-amp

The question does not imply that only one op amp should be used. And in fact, it's not really possible to reliably do it with just a single op-amp. Two of them in series, each with 20dB gain, will do ...
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1 vote

Mathematical difference between FFT and STFT

Can a FFT be recreated by performing STFT on the smaller time intervals and then summing them up. No. The STFT loses no information, it's invertible. Until that is, you take the magnitude, which you ...
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3 votes

Can high frequency AC show as DC on a multimeter?

It appears to be possible if you grossly overload the input on some multimeters. Trying a 7V RMS 400Hz sine wave into a Fluke handheld and a Uni-T handheld, the Fluke showed only a 14mV offset that ...
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4 votes

How can I measure 400 kHz frequency?

Feed your 400 kHz square signal to a (any) counter IC to reduce the frequency of the signal (the counter acts as a frequency divider, but with higher division rates than your divide-by-2). Then use an ...
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0 votes

Electrical theory regarding load sharing

I deal with this sometimes, please correct if I'm explaining it wrong. When you raise the frequency of the generator the controller will give more throttle. More throttle causes the engine or turbine ...
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0 votes

Can motor run capacitors be used in high frequency applications?

3 things may limit the usefulness of these capacitors: Rather high ESR, parasitic inductance and loses. Motors generally don't care about things like ESR. Your proposed application may as well depend ...
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1 vote

Can motor run capacitors be used in high frequency applications?

Not really. The basic construction isn't too different from a high frequency capacitor -- a roll of film and foil (or metallization) -- except in termination: typically, a pair of foil connections ...
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2 votes

Electrical theory regarding load sharing

Two power generators connected to a shared load. Image source: State Library of Victoria - Creative Commons licence. In much the same way as the generators in your question, if either of the riders ...
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1 vote

Electrical theory regarding load sharing

As user @Bryan has noticed in his comment, knowing the principle of the generators helps to understand what happens if only one of the generators is accelerated. Bryan said that looks like the AC ...
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2 votes

TLC555 Constant Frequency, Adjustable Duty Cycle

500kHz PWM with 5% duty cycle (or 95%) implies 100ns on or off time. Without detailed examination of the datasheet, that seems extremely unlikely for a device (TLC555) that is only guaranteed to make ...
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1 vote

TLC555 Constant Frequency, Adjustable Duty Cycle

I would like someone to show me how to derive the formulas that relate R1, R2, Rx, Ry, and C1 to the frequency and the duty cycles I would like to achieve. Take a look at my answer here about ...
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4 votes
Accepted

Can LEDs produce light like incandescent light?

Add a capacitor. The capacitor stores up charge when the AC voltage is at its highest. It releases the charge as the AC voltage drops back to zero. This keeps current flowing through the LEDs all ...
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